init

CamperMonitor/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,4 @@
+{
+  "colors" : [ { "color" : { "color-space" : "srgb", "components" : { "alpha" : "1.000", "blue" : "0.400", "green" : "0.620", "red" : "0.110" } }, "idiom" : "universal" } ],
+  "info" : { "author" : "xcode", "version" : 1 }
+}

CamperMonitor/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,4 @@
+{
+  "images" : [ { "idiom" : "universal", "platform" : "ios", "size" : "1024x1024" } ],
+  "info" : { "author" : "xcode", "version" : 1 }
+}

CamperMonitor/Assets.xcassets/Contents.json

@@ -0,0 +1 @@
+{ "info" : { "author" : "xcode", "version" : 1 } }

CamperMonitor/Bluetooth/AESCounterMode.swift

@@ -0,0 +1,46 @@
+import CommonCrypto
+import Foundation
+
+/// AES-128 im Counter-Modus. CryptoKit bietet CTR nicht an, deshalb CommonCrypto.
+enum AESCounterMode {
+    /// - Parameters:
+    ///   - data: Der verschlüsselte Nutzteil des Advertisements.
+    ///   - key: 16 Byte Geräteschlüssel aus VictronConnect.
+    ///   - nonce: Der 16-Byte-Zählerblock (Victron: Nonce little-endian in den
+    ///            ersten beiden Bytes, Rest 0).
+    static func crypt(_ data: [UInt8], key: [UInt8], nonce: [UInt8]) -> [UInt8]? {
+        guard key.count == kCCKeySizeAES128, nonce.count == kCCBlockSizeAES128 else { return nil }
+
+        var cryptor: CCCryptorRef?
+        let createStatus = key.withUnsafeBytes { keyBuffer in
+            nonce.withUnsafeBytes { ivBuffer in
+                CCCryptorCreateWithMode(
+                    CCOperation(kCCEncrypt),          // CTR ist symmetrisch
+                    CCMode(kCCModeCTR),
+                    CCAlgorithm(kCCAlgorithmAES),
+                    CCPadding(ccNoPadding),
+                    ivBuffer.baseAddress,
+                    keyBuffer.baseAddress, key.count,
+                    nil, 0, 0,
+                    CCModeOptions(kCCModeOptionCTR_BE),
+                    &cryptor
+                )
+            }
+        }
+        guard createStatus == kCCSuccess, let cryptor else { return nil }
+        defer { CCCryptorRelease(cryptor) }
+
+        var output = [UInt8](repeating: 0, count: data.count)
+        var moved = 0
+        let updateStatus = data.withUnsafeBytes { input in
+            output.withUnsafeMutableBytes { out in
+                CCCryptorUpdate(cryptor,
+                                input.baseAddress, data.count,
+                                out.baseAddress, data.count,
+                                &moved)
+            }
+        }
+        guard updateStatus == kCCSuccess else { return nil }
+        return Array(output.prefix(moved))
+    }
+}

CamperMonitor/Bluetooth/BMSSession.swift

@@ -0,0 +1,297 @@
+import CoreBluetooth
+import Foundation
+
+/// Hält die GATT-Verbindung zu einem BMS, pollt die Werte und meldet fertige
+/// Snapshots zurück.
+///
+/// Unterstützt drei Dialekte und erkennt selbst, welchen das Gerät spricht:
+///
+/// * **Daly klassisch** – 13-Byte-Rahmen, beginnend mit `A5`
+/// * **Daly Modbus** – `D2 03 …`, neuere Daly-Firmware
+/// * **JBD / Xiaoxiang** – `DD A5 …`, u.a. in WattCycle-Akkus
+///
+/// Auch die BLE-Charakteristiken werden gesucht statt vorausgesetzt: die Module
+/// unterscheiden sich zwischen Herstellern und Fertigungschargen.
+final class BMSSession: NSObject {
+
+    /// Bekannte Dienste, in Reihenfolge der Wahrscheinlichkeit.
+    private static let preferredServices: [CBUUID] = [
+        CBUUID(string: "FFF0"),   // Daly
+        CBUUID(string: "FF00"),   // JBD
+        CBUUID(string: "FFE0"),
+        CBUUID(string: "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"), // Nordic UART
+    ]
+
+    enum Dialect: String {
+        case unknown      = "wird ermittelt"
+        case dalyClassic  = "Daly (klassisch)"
+        case dalyModbus   = "Daly (Modbus)"
+        case jbd          = "JBD / Xiaoxiang"
+    }
+
+    let deviceID: UUID
+    private let peripheral: CBPeripheral
+    private let onUpdate: (DeviceSnapshot) -> Void
+    private let onStateChange: (DeviceLinkState) -> Void
+    private let onDiagnostics: (BMSDiagnostics) -> Void
+
+    private var writeCharacteristic: CBCharacteristic?
+    private var notifyCharacteristic: CBCharacteristic?
+
+    private(set) var dialect: Dialect = .unknown
+    private var dalyState = DalyState()
+    private var jbdState = JBDState()
+    private var buffer: [UInt8] = []
+    private var pollTimer: Timer?
+    private var silentRounds = 0
+    private var lastResponse: Data?
+
+    /// Abstand zwischen zwei Abfragerunden.
+    var pollInterval: TimeInterval = 5
+
+    init(deviceID: UUID,
+         peripheral: CBPeripheral,
+         onUpdate: @escaping (DeviceSnapshot) -> Void,
+         onStateChange: @escaping (DeviceLinkState) -> Void,
+         onDiagnostics: @escaping (BMSDiagnostics) -> Void) {
+        self.deviceID = deviceID
+        self.peripheral = peripheral
+        self.onUpdate = onUpdate
+        self.onStateChange = onStateChange
+        self.onDiagnostics = onDiagnostics
+        super.init()
+        peripheral.delegate = self
+    }
+
+    // MARK: - Lebenszyklus
+
+    func start() {
+        onStateChange(.connecting)
+        peripheral.discoverServices(nil)
+    }
+
+    func stop() {
+        pollTimer?.invalidate()
+        pollTimer = nil
+        if let notifyCharacteristic, peripheral.state == .connected {
+            peripheral.setNotifyValue(false, for: notifyCharacteristic)
+        }
+        writeCharacteristic = nil
+        notifyCharacteristic = nil
+        dialect = .unknown
+        buffer.removeAll()
+    }
+
+    func handleDisconnect() {
+        pollTimer?.invalidate()
+        pollTimer = nil
+        writeCharacteristic = nil
+        notifyCharacteristic = nil
+        buffer.removeAll()
+    }
+
+    // MARK: - Abfrage
+
+    private func beginPolling() {
+        pollTimer?.invalidate()
+        onStateChange(.live)
+        poll()
+        pollTimer = Timer.scheduledTimer(withTimeInterval: pollInterval, repeats: true) { [weak self] _ in
+            self?.poll()
+        }
+    }
+
+    private func poll() {
+        guard peripheral.state == .connected, writeCharacteristic != nil else { return }
+
+        switch dialect {
+        case .unknown:
+            probeDialects()
+        case .dalyClassic:
+            sendSequence(DalyProtocol.Command.allCases.map { DalyProtocol.requestFrame($0) })
+        case .dalyModbus:
+            sendSequence([DalyProtocol.modbusReadFrame()])
+        case .jbd:
+            sendSequence(JBDProtocol.Command.allCases.map { JBDProtocol.requestFrame($0) })
+        }
+    }
+
+    /// Nacheinander alle bekannten Anfragen schicken. Der erste gültige Rahmen
+    /// in der Antwort legt den Dialekt fest.
+    private func probeDialects() {
+        let probes: [Data] = [
+            DalyProtocol.requestFrame(.soc),
+            JBDProtocol.requestFrame(.basicInfo),
+            DalyProtocol.modbusReadFrame(),
+        ]
+        for (index, probe) in probes.enumerated() {
+            DispatchQueue.main.asyncAfter(deadline: .now() + Double(index) * 1.5) { [weak self] in
+                guard let self, self.dialect == .unknown else { return }
+                self.send(probe)
+            }
+        }
+        checkForSilence(after: Double(probes.count) * 1.5 + 1.5)
+    }
+
+    /// Kommandos leicht versetzt senden – manche Module verschlucken Anfragen,
+    /// die zu dicht aufeinander folgen.
+    private func sendSequence(_ frames: [Data]) {
+        for (index, frame) in frames.enumerated() {
+            DispatchQueue.main.asyncAfter(deadline: .now() + Double(index) * 0.25) { [weak self] in
+                self?.send(frame)
+            }
+        }
+        checkForSilence(after: Double(frames.count) * 0.25 + 2)
+    }
+
+    /// Kommt mehrere Runden nichts Brauchbares zurück, wird der erkannte
+    /// Dialekt verworfen und neu gesucht.
+    private func checkForSilence(after delay: TimeInterval) {
+        DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self] in
+            guard let self else { return }
+            guard !self.hasUsableData else {
+                self.silentRounds = 0
+                return
+            }
+            self.silentRounds += 1
+            if self.silentRounds >= 3 {
+                self.silentRounds = 0
+                self.dialect = .unknown
+                self.onStateChange(.failed("Keine verwertbare Antwort vom BMS"))
+                self.publishDiagnostics()
+            }
+        }
+    }
+
+    private var hasUsableData: Bool {
+        dalyState.hasUsableData || jbdState.hasUsableData
+    }
+
+    private func send(_ data: Data) {
+        guard let characteristic = writeCharacteristic else { return }
+        let type: CBCharacteristicWriteType =
+            characteristic.properties.contains(.writeWithoutResponse) ? .withoutResponse : .withResponse
+        peripheral.writeValue(data, for: characteristic, type: type)
+    }
+
+    // MARK: - Auswertung
+
+    private func consume(_ data: Data) {
+        lastResponse = data
+        buffer.append(contentsOf: [UInt8](data))
+        if buffer.count > 512 { buffer.removeFirst(buffer.count - 512) }
+
+        // JBD zuerst: der Rahmen ist durch Start-, Endbyte und Prüfsumme
+        // eindeutig und kann nicht mit den Daly-Rahmen verwechselt werden.
+        let (jbdFrames, jbdRemainder) = JBDProtocol.extractFrames(from: buffer)
+        if !jbdFrames.isEmpty {
+            buffer = jbdRemainder
+            dialect = .jbd
+            silentRounds = 0
+            for frame in jbdFrames { jbdState.apply(frame) }
+            publish(jbdState.snapshot(deviceID: deviceID, rssi: nil), usable: jbdState.hasUsableData)
+            return
+        }
+
+        if let start = buffer.firstIndex(where: { $0 == 0xD2 }),
+           let registers = DalyProtocol.parseModbusResponse(Array(buffer[start...])) {
+            buffer.removeAll()
+            dialect = .dalyModbus
+            silentRounds = 0
+            dalyState.apply(registers: registers)
+            publish(dalyState.snapshot(deviceID: deviceID, rssi: nil), usable: dalyState.hasUsableData)
+            return
+        }
+
+        let (dalyFrames, dalyRemainder) = DalyProtocol.extractA5Frames(from: buffer)
+        if !dalyFrames.isEmpty {
+            buffer = dalyRemainder
+            dialect = .dalyClassic
+            silentRounds = 0
+            for frame in dalyFrames { dalyState.apply(frame) }
+            publish(dalyState.snapshot(deviceID: deviceID, rssi: nil), usable: dalyState.hasUsableData)
+            return
+        }
+
+        // Nichts erkannt – trotzdem melden, damit die Diagnose etwas zeigt.
+        publishDiagnostics()
+    }
+
+    private func publish(_ snapshot: DeviceSnapshot, usable: Bool) {
+        publishDiagnostics()
+        guard usable else { return }
+        onStateChange(.live)
+        onUpdate(snapshot)
+    }
+
+    private func publishDiagnostics() {
+        onDiagnostics(BMSDiagnostics(
+            dialect: dialect.rawValue,
+            serviceUUID: writeCharacteristic?.service?.uuid.uuidString,
+            writeUUID: writeCharacteristic?.uuid.uuidString,
+            notifyUUID: notifyCharacteristic?.uuid.uuidString,
+            lastResponseHex: lastResponse.map { $0.map { String(format: "%02X", $0) }.joined(separator: " ") },
+            updated: Date()
+        ))
+    }
+}
+
+// MARK: - CBPeripheralDelegate
+
+extension BMSSession: CBPeripheralDelegate {
+
+    func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
+        if let error {
+            onStateChange(.failed(error.localizedDescription))
+            return
+        }
+        for service in peripheral.services ?? [] {
+            peripheral.discoverCharacteristics(nil, for: service)
+        }
+    }
+
+    func peripheral(_ peripheral: CBPeripheral,
+                    didDiscoverCharacteristicsFor service: CBService,
+                    error: Error?) {
+        guard error == nil, let characteristics = service.characteristics else { return }
+
+        let writable = characteristics.first {
+            $0.properties.contains(.write) || $0.properties.contains(.writeWithoutResponse)
+        }
+        let notifying = characteristics.first {
+            $0.properties.contains(.notify) || $0.properties.contains(.indicate)
+        }
+        guard let writable, let notifying else { return }
+
+        // Einen bekannten Dienst immer bevorzugen, sonst den erstbesten nehmen.
+        let isPreferred = Self.preferredServices.contains(service.uuid)
+        let alreadyPreferred = writeCharacteristic
+            .flatMap { $0.service?.uuid }
+            .map { Self.preferredServices.contains($0) } ?? false
+        guard writeCharacteristic == nil || (isPreferred && !alreadyPreferred) else { return }
+
+        writeCharacteristic = writable
+        notifyCharacteristic = notifying
+        peripheral.setNotifyValue(true, for: notifying)
+    }
+
+    func peripheral(_ peripheral: CBPeripheral,
+                    didUpdateNotificationStateFor characteristic: CBCharacteristic,
+                    error: Error?) {
+        if let error {
+            onStateChange(.failed(error.localizedDescription))
+            return
+        }
+        if characteristic.isNotifying, characteristic == notifyCharacteristic {
+            publishDiagnostics()
+            beginPolling()
+        }
+    }
+
+    func peripheral(_ peripheral: CBPeripheral,
+                    didUpdateValueFor characteristic: CBCharacteristic,
+                    error: Error?) {
+        guard error == nil, let value = characteristic.value else { return }
+        consume(value)
+    }
+}

CamperMonitor/Bluetooth/BitReader.swift

@@ -0,0 +1,61 @@
+import Foundation
+
+/// Liest Felder beliebiger Bitbreite aus einem Byte-Array.
+///
+/// Victron packt die Felder seiner Werbedaten little-endian und bitweise ohne
+/// Byte-Ausrichtung: das erste Feld beginnt am niederwertigsten Bit von Byte 0,
+/// jedes weitere schliesst direkt an.
+struct BitReader {
+    private let bytes: [UInt8]
+    private var bitOffset = 0
+
+    init(_ bytes: [UInt8]) { self.bytes = bytes }
+
+    var bitsRemaining: Int { bytes.count * 8 - bitOffset }
+
+    /// Liest `width` Bits als vorzeichenlose Zahl. Gibt nil zurück, wenn die
+    /// Daten zu kurz sind.
+    mutating func read(_ width: Int) -> UInt32? {
+        guard width > 0, width <= 32, bitsRemaining >= width else { return nil }
+        var result: UInt32 = 0
+        for i in 0..<width {
+            let absolute = bitOffset + i
+            let byte = bytes[absolute / 8]
+            let bit = (byte >> UInt8(absolute % 8)) & 1
+            result |= UInt32(bit) << UInt32(i)
+        }
+        bitOffset += width
+        return result
+    }
+
+    /// Wie `read`, liefert aber nil wenn alle Bits gesetzt sind – so markiert
+    /// Victron "Wert nicht verfügbar".
+    mutating func readOptional(_ width: Int) -> UInt32? {
+        guard let raw = read(width) else { return nil }
+        let notAvailable: UInt32 = width >= 32 ? .max : (1 << UInt32(width)) - 1
+        return raw == notAvailable ? nil : raw
+    }
+
+    /// Zweierkomplement-Feld. Der NA-Wert 0x7F..F wird zu nil.
+    mutating func readOptionalSigned(_ width: Int) -> Int32? {
+        guard width > 1, let raw = read(width) else { return nil }
+        let notAvailable: UInt32 = (1 << UInt32(width - 1)) - 1
+        if raw == notAvailable { return nil }
+        let signBit: UInt32 = 1 << UInt32(width - 1)
+        if raw & signBit != 0 {
+            let mask: UInt32 = width >= 32 ? 0 : ~((1 << UInt32(width)) - 1)
+            return Int32(bitPattern: raw | mask)
+        }
+        return Int32(bitPattern: raw)
+    }
+
+    /// Skaliertes, optionales Feld ohne Vorzeichen.
+    mutating func scaled(_ width: Int, _ factor: Double) -> Double? {
+        readOptional(width).map { Double($0) * factor }
+    }
+
+    /// Skaliertes, optionales Feld mit Vorzeichen.
+    mutating func scaledSigned(_ width: Int, _ factor: Double) -> Double? {
+        readOptionalSigned(width).map { Double($0) * factor }
+    }
+}

CamperMonitor/Bluetooth/BluetoothManager.swift

@@ -0,0 +1,437 @@
+import CoreBluetooth
+import Foundation
+import Observation
+
+/// Ein während des Einrichtens gefundenes Gerät.
+struct Discovery: Identifiable, Hashable {
+    let id: UUID
+    var name: String?
+    /// Geglättet, damit die Signalanzeige nicht flackert.
+    var rssi: Int
+    /// Sortierschlüssel: die Reihenfolge des Auftauchens ist stabil,
+    /// die Signalstärke wäre es nicht.
+    var firstSeen: Date
+    var lastSeen: Date
+    var victronRecordType: UInt8?
+    var victronProductID: UInt16?
+    var looksLikeDaly: Bool
+
+    var isVictron: Bool { victronRecordType != nil }
+
+    var displayName: String {
+        if let name, !name.isEmpty { return name }
+        return isVictron ? "Victron-Gerät" : "Unbenanntes Gerät"
+    }
+
+    var subtitle: String {
+        if let type = victronRecordType {
+            return "Victron · " + Self.victronRecordName(type)
+        }
+        if looksLikeDaly { return "Sieht nach Daly BMS aus" }
+        return "Bluetooth-Gerät"
+    }
+
+    static func victronRecordName(_ type: UInt8) -> String {
+        switch VictronAdvertisement.RecordType(rawValue: type) {
+        case .solarCharger:        return "Solarladeregler"
+        case .batteryMonitor:      return "Batteriewächter"
+        case .inverter:            return "Wechselrichter"
+        case .dcdcConverter:       return "DC/DC-Lader (Orion-TR)"
+        case .orionXS:             return "Orion XS"
+        case .acCharger:           return "AC-Ladegerät"
+        case .smartLithium:        return "Smart Lithium"
+        case .smartBatteryProtect: return "Battery Protect"
+        case .lynxSmartBMS:        return "Lynx Smart BMS"
+        case .dcEnergyMeter:       return "DC-Energiezähler"
+        default:                   return String(format: "Typ 0x%02X", type)
+        }
+    }
+}
+
+/// Was ein Victron-Gerät unverschlüsselt mitsendet. Wird unabhängig vom
+/// Schlüssel gefüllt und hilft, eine falsche Eingabe einzugrenzen.
+struct VictronDiagnostics: Hashable {
+    var productID: UInt16
+    var recordType: UInt8
+    var expectedKeyFirstByte: UInt8
+    var nonce: UInt16
+    var payloadLength: Int
+    var rawHex: String
+    var updated: Date
+
+    var recordName: String { Discovery.victronRecordName(recordType) }
+    var productIDText: String { String(format: "0x%04X", productID) }
+    var expectedKeyText: String { String(format: "0x%02X", expectedKeyFirstByte) }
+}
+
+/// Was bei der BMS-Verbindung erkannt wurde. Zeigt, ob und welches Protokoll
+/// greift, und gibt die letzte Rohantwort zum Nachsehen aus.
+struct BMSDiagnostics: Hashable {
+    var dialect: String
+    var serviceUUID: String?
+    var writeUUID: String?
+    var notifyUUID: String?
+    var lastResponseHex: String?
+    var updated: Date
+}
+
+/// Ein Messpunkt für die Verlaufsgrafik.
+struct HistorySample: Identifiable, Hashable {
+    let id = UUID()
+    let time: Date
+    let value: Double
+}
+
+/// Zentrale Bluetooth-Schicht: scannt dauerhaft nach Victron-Werbedaten und
+/// hält parallel die Verbindung zum Daly-BMS.
+@Observable
+final class BluetoothManager: NSObject {
+
+    private(set) var snapshots: [UUID: DeviceSnapshot] = [:]
+    private(set) var linkStates: [UUID: DeviceLinkState] = [:]
+    private(set) var discoveries: [UUID: Discovery] = [:]
+    private(set) var history: [UUID: [HistorySample]] = [:]
+    private(set) var diagnostics: [UUID: VictronDiagnostics] = [:]
+    private(set) var bmsDiagnostics: [UUID: BMSDiagnostics] = [:]
+    private(set) var isBluetoothReady = false
+    private(set) var bluetoothStatusText = "Bluetooth wird gestartet…"
+
+    /// Solange true, werden alle gefundenen Peripherals gesammelt.
+    var isDiscovering = false {
+        didSet {
+            restartScan()
+            isDiscovering ? startDiscoveryFlush() : stopDiscoveryFlush()
+        }
+    }
+
+    private let store: DeviceStore
+    private var central: CBCentralManager?
+    private var bmsSessions: [UUID: BMSSession] = [:]
+    private var connectedPeripherals: [UUID: CBPeripheral] = [:]
+    private var reconnectTimer: Timer?
+
+    /// Advertisements treffen mehrmals pro Sekunde und Gerät ein. Sie werden
+    /// hier gesammelt und nur im Sekundentakt an die Ansicht durchgereicht –
+    /// sonst baut sich die Liste unter dem Finger ständig neu auf.
+    private var pendingDiscoveries: [UUID: Discovery] = [:]
+    private var discoveryFlushTimer: Timer?
+
+    /// Wieviele Messpunkte je Gerät im Verlauf behalten werden.
+    private let historyLimit = 720
+
+    /// Im Demo-Modus wird nichts gefunkt, die Werte kommen aus `DemoData`.
+    private let isDemo = DemoData.isEnabled
+
+    init(store: DeviceStore) {
+        self.store = store
+        super.init()
+        if isDemo {
+            loadDemoData()
+            return
+        }
+        central = CBCentralManager(delegate: self, queue: .main)
+    }
+
+    private func loadDemoData() {
+        isBluetoothReady = true
+        bluetoothStatusText = "Demo-Modus"
+        for snapshot in DemoData.snapshots() {
+            snapshots[snapshot.deviceID] = snapshot
+            linkStates[snapshot.deviceID] = .live
+            if let value = snapshot.primaryMetric?.value {
+                history[snapshot.deviceID] = DemoData.history(for: snapshot.deviceID, around: value)
+            }
+        }
+    }
+
+    // MARK: - Steuerung
+
+    func start() {
+        guard !isDemo, central?.state == .poweredOn else { return }
+        restartScan()
+        connectManagedPeripherals()
+        scheduleReconnects()
+    }
+
+    func stop() {
+        guard !isDemo else { return }
+        central?.stopScan()
+        reconnectTimer?.invalidate()
+        reconnectTimer = nil
+        stopDiscoveryFlush()
+        for (_, session) in bmsSessions { session.stop() }
+        for (_, peripheral) in connectedPeripherals { central?.cancelPeripheralConnection(peripheral) }
+        bmsSessions.removeAll()
+        connectedPeripherals.removeAll()
+    }
+
+    /// Nach Änderungen an der Geräteliste aufrufen.
+    func refreshConfiguration() {
+        guard !isDemo else { return }
+        let managed = Set(store.activeDevices.filter { $0.role.transport == .connect }.map(\.peripheralID))
+        for (peripheralID, session) in bmsSessions where !managed.contains(peripheralID) {
+            session.stop()
+            bmsSessions[peripheralID] = nil
+            if let peripheral = connectedPeripherals[peripheralID] {
+                central?.cancelPeripheralConnection(peripheral)
+                connectedPeripherals[peripheralID] = nil
+            }
+        }
+        let known = Set(store.activeDevices.map(\.id))
+        snapshots = snapshots.filter { known.contains($0.key) }
+        linkStates = linkStates.filter { known.contains($0.key) }
+        history = history.filter { known.contains($0.key) }
+        diagnostics = diagnostics.filter { known.contains($0.key) }
+        bmsDiagnostics = bmsDiagnostics.filter { known.contains($0.key) }
+        connectManagedPeripherals()
+        restartScan()
+    }
+
+    func clearDiscoveries() {
+        discoveries.removeAll()
+        pendingDiscoveries.removeAll()
+    }
+
+    private func startDiscoveryFlush() {
+        discoveryFlushTimer?.invalidate()
+        discoveryFlushTimer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { [weak self] _ in
+            guard let self else { return }
+            // Verschwundene Geräte erst nach einer Weile fallen lassen, damit
+            // ein Eintrag nicht wegen eines verpassten Pakets verschwindet.
+            let cutoff = Date().addingTimeInterval(-20)
+            self.pendingDiscoveries = self.pendingDiscoveries.filter { $0.value.lastSeen > cutoff }
+            self.discoveries = self.pendingDiscoveries
+        }
+    }
+
+    private func stopDiscoveryFlush() {
+        discoveryFlushTimer?.invalidate()
+        discoveryFlushTimer = nil
+    }
+
+    // MARK: - Scannen
+
+    private func restartScan() {
+        guard !isDemo, central?.state == .poweredOn else { return }
+        central?.stopScan()
+        // Victron sendet seine Werte im Advertisement, also müssen auch
+        // Wiederholungen durchgereicht werden.
+        central?.scanForPeripherals(
+            withServices: nil,
+            options: [CBCentralManagerScanOptionAllowDuplicatesKey: true]
+        )
+    }
+
+    private func connectManagedPeripherals() {
+        guard !isDemo, central?.state == .poweredOn else { return }
+        for device in store.activeDevices where device.role.transport == .connect {
+            connectIfNeeded(device)
+        }
+    }
+
+    private func connectIfNeeded(_ device: ConfiguredDevice) {
+        let peripheralID = device.peripheralID
+        if let existing = connectedPeripherals[peripheralID],
+           existing.state == .connected || existing.state == .connecting {
+            return
+        }
+        guard let peripheral = central?.retrievePeripherals(withIdentifiers: [peripheralID]).first else {
+            linkStates[device.id] = .searching
+            return
+        }
+        connectedPeripherals[peripheralID] = peripheral
+        linkStates[device.id] = .connecting
+        central?.connect(peripheral, options: nil)
+    }
+
+    /// Verbindungen fallen im Fahrzeug regelmässig weg – deshalb regelmässig
+    /// nachfassen statt nur auf das Disconnect-Ereignis zu reagieren.
+    private func scheduleReconnects() {
+        reconnectTimer?.invalidate()
+        reconnectTimer = Timer.scheduledTimer(withTimeInterval: 15, repeats: true) { [weak self] _ in
+            self?.connectManagedPeripherals()
+        }
+    }
+
+    // MARK: - Auswertung
+
+    private func record(_ snapshot: DeviceSnapshot) {
+        snapshots[snapshot.deviceID] = snapshot
+        guard let primary = snapshot.primaryMetric, let value = primary.value else { return }
+        var samples = history[snapshot.deviceID] ?? []
+        // Höchstens alle fünf Sekunden einen Punkt aufnehmen.
+        if let last = samples.last, snapshot.timestamp.timeIntervalSince(last.time) < 5 { return }
+        samples.append(HistorySample(time: snapshot.timestamp, value: value))
+        if samples.count > historyLimit { samples.removeFirst(samples.count - historyLimit) }
+        history[snapshot.deviceID] = samples
+    }
+
+    private func handleVictronAdvertisement(_ manufacturerData: Data,
+                                            device: ConfiguredDevice,
+                                            rssi: Int) {
+        // Zuerst den unverschlüsselten Rahmen festhalten – gerade wenn der
+        // Schlüssel nicht passt, ist das die einzige verwertbare Information.
+        if let envelope = VictronAdvertisement.envelope(from: manufacturerData) {
+            diagnostics[device.id] = VictronDiagnostics(
+                productID: envelope.productID,
+                recordType: envelope.recordType,
+                expectedKeyFirstByte: envelope.keyCheckByte,
+                nonce: envelope.nonce,
+                payloadLength: envelope.ciphertext.count,
+                rawHex: manufacturerData.map { String(format: "%02X", $0) }.joined(separator: " "),
+                updated: Date()
+            )
+        }
+
+        guard let key = store.victronKeyBytes(for: device.id) else {
+            linkStates[device.id] = .needsKey
+            return
+        }
+        do {
+            let snapshot = try VictronAdvertisement.decode(manufacturerData: manufacturerData,
+                                                           key: key,
+                                                           deviceID: device.id,
+                                                           rssi: rssi)
+            linkStates[device.id] = .live
+            record(snapshot)
+        } catch let error as VictronAdvertisement.DecodeError {
+            switch error {
+            case .notVictron:
+                break   // Fremdes Advertisement desselben Peripherals, ignorieren.
+            default:
+                linkStates[device.id] = .failed(error.localizedDescription)
+            }
+        } catch {
+            linkStates[device.id] = .failed(error.localizedDescription)
+        }
+    }
+
+    private func updateDiscovery(peripheral: CBPeripheral,
+                                 advertisementData: [String: Any],
+                                 rssi: Int) {
+        let manufacturerData = advertisementData[CBAdvertisementDataManufacturerDataKey] as? Data
+        let envelope = manufacturerData.flatMap { VictronAdvertisement.envelope(from: $0) }
+        let name = (advertisementData[CBAdvertisementDataLocalNameKey] as? String) ?? peripheral.name
+
+        let existing = pendingDiscoveries[peripheral.identifier]
+        var entry = existing ?? Discovery(
+            id: peripheral.identifier,
+            name: name,
+            rssi: rssi,
+            firstSeen: Date(),
+            lastSeen: Date(),
+            victronRecordType: nil,
+            victronProductID: nil,
+            looksLikeDaly: false
+        )
+        // Gleitender Mittelwert über die letzten Messungen.
+        entry.rssi = existing.map { ($0.rssi * 3 + rssi) / 4 } ?? rssi
+        entry.lastSeen = Date()
+        if let name, !name.isEmpty { entry.name = name }
+        if let envelope {
+            entry.victronRecordType = envelope.recordType
+            entry.victronProductID = envelope.productID
+        }
+        entry.looksLikeDaly = Self.looksLikeDaly(name: entry.name)
+        pendingDiscoveries[peripheral.identifier] = entry
+    }
+
+    /// Die BLE-Module der Daly-BMS melden sich meist als "DL-…" oder tragen
+    /// "BMS" im Namen. Nur ein Hinweis für die Liste – auswählbar ist alles.
+    private static func looksLikeDaly(name: String?) -> Bool {
+        guard let name = name?.lowercased() else { return false }
+        return name.hasPrefix("dl-") || name.contains("daly") || name.contains("bms")
+            || name.contains("bulltron") || name.hasPrefix("smart bms")
+    }
+}
+
+// MARK: - CBCentralManagerDelegate
+
+extension BluetoothManager: CBCentralManagerDelegate {
+
+    func centralManagerDidUpdateState(_ central: CBCentralManager) {
+        switch central.state {
+        case .poweredOn:
+            isBluetoothReady = true
+            bluetoothStatusText = "Bereit"
+            start()
+        case .poweredOff:
+            isBluetoothReady = false
+            bluetoothStatusText = "Bluetooth ist ausgeschaltet"
+        case .unauthorized:
+            isBluetoothReady = false
+            bluetoothStatusText = "Bluetooth-Zugriff wurde nicht erlaubt"
+        case .unsupported:
+            isBluetoothReady = false
+            bluetoothStatusText = "Dieses Gerät unterstützt kein Bluetooth LE"
+        default:
+            isBluetoothReady = false
+            bluetoothStatusText = "Bluetooth wird gestartet…"
+        }
+    }
+
+    func centralManager(_ central: CBCentralManager,
+                        didDiscover peripheral: CBPeripheral,
+                        advertisementData: [String: Any],
+                        rssi RSSI: NSNumber) {
+        let rssi = RSSI.intValue
+
+        if isDiscovering {
+            updateDiscovery(peripheral: peripheral, advertisementData: advertisementData, rssi: rssi)
+        }
+
+        guard let device = store.device(withPeripheralID: peripheral.identifier) else { return }
+
+        switch device.role.transport {
+        case .advertisement:
+            guard let manufacturerData = advertisementData[CBAdvertisementDataManufacturerDataKey] as? Data
+            else { return }
+            handleVictronAdvertisement(manufacturerData, device: device, rssi: rssi)
+
+        case .connect:
+            // Das BMS wurde gesehen – falls die Verbindung fehlt, jetzt aufbauen.
+            if connectedPeripherals[peripheral.identifier] == nil {
+                connectIfNeeded(device)
+            }
+        }
+    }
+
+    func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
+        guard let device = store.device(withPeripheralID: peripheral.identifier) else { return }
+        connectedPeripherals[peripheral.identifier] = peripheral
+
+        let session = BMSSession(
+            deviceID: device.id,
+            peripheral: peripheral,
+            onUpdate: { [weak self] snapshot in self?.record(snapshot) },
+            onStateChange: { [weak self] state in self?.linkStates[device.id] = state },
+            onDiagnostics: { [weak self] info in self?.bmsDiagnostics[device.id] = info }
+        )
+        bmsSessions[peripheral.identifier] = session
+        session.start()
+    }
+
+    func centralManager(_ central: CBCentralManager,
+                        didFailToConnect peripheral: CBPeripheral,
+                        error: Error?) {
+        if let device = store.device(withPeripheralID: peripheral.identifier) {
+            linkStates[device.id] = .failed(error?.localizedDescription ?? "Verbindung fehlgeschlagen")
+        }
+        connectedPeripherals[peripheral.identifier] = nil
+    }
+
+    func centralManager(_ central: CBCentralManager,
+                        didDisconnectPeripheral peripheral: CBPeripheral,
+                        error: Error?) {
+        bmsSessions[peripheral.identifier]?.handleDisconnect()
+        bmsSessions[peripheral.identifier] = nil
+        connectedPeripherals[peripheral.identifier] = nil
+
+        if let device = store.device(withPeripheralID: peripheral.identifier) {
+            linkStates[device.id] = .searching
+            // Direkt wieder anfragen; iOS stellt die Verbindung her, sobald das
+            // Gerät wieder in Reichweite ist.
+            connectIfNeeded(device)
+        }
+    }
+}

CamperMonitor/Bluetooth/DalyProtocol.swift

@@ -0,0 +1,123 @@
+import Foundation
+
+/// Reine Protokoll-Logik für Daly-BMS – ohne CoreBluetooth, damit sie sich
+/// isoliert prüfen lässt.
+///
+/// Daly hat zwei Generationen im Umlauf:
+///
+/// * **Klassisch (`A5`)** – 13-Byte-Rahmen `A5 <adr> <cmd> 08 <8 Datenbytes> <Prüfsumme>`.
+///   Verbreitet bei den Smart-BMS mit dem blauen BLE-Stick, wie sie in vielen
+///   Bulltron-Akkus stecken.
+/// * **Neu (`D2`)** – Modbus-RTU über BLE, `D2 03 <Startregister> <Anzahl> <CRC16>`.
+///
+/// Welche Generation verbaut ist, erkennt `DalySession` anhand der Antwort.
+enum DalyProtocol {
+
+    // MARK: - Klassisches A5-Protokoll
+
+    enum Command: UInt8, CaseIterable {
+        case soc            = 0x90  // Spannung, Strom, Ladezustand
+        case cellVoltageMinMax = 0x91
+        case temperatureMinMax = 0x92
+        case mosfetStatus   = 0x93
+        case statusInfo     = 0x94
+        case cellVoltages   = 0x95
+        case cellTemperatures = 0x96
+    }
+
+    /// Adresse des Anfragenden. 0x80 = Bluetooth-Modul.
+    static let hostAddress: UInt8 = 0x80
+
+    static func requestFrame(_ command: Command) -> Data {
+        var frame: [UInt8] = [0xA5, hostAddress, command.rawValue, 0x08]
+        frame.append(contentsOf: [UInt8](repeating: 0, count: 8))
+        frame.append(frame.reduce(0) { UInt8(($0 &+ $1) & 0xFF) })
+        return Data(frame)
+    }
+
+    struct Frame {
+        let address: UInt8
+        let command: UInt8
+        let payload: [UInt8]   // immer 8 Bytes
+    }
+
+    /// Sucht vollständige, prüfsummenkorrekte A5-Rahmen im Puffer und gibt sie
+    /// zusammen mit dem unverbrauchten Rest zurück.
+    static func extractA5Frames(from buffer: [UInt8]) -> (frames: [Frame], remainder: [UInt8]) {
+        var frames: [Frame] = []
+        var index = 0
+        var lastConsumed = 0
+
+        while index + 13 <= buffer.count {
+            guard buffer[index] == 0xA5, buffer[index + 3] == 0x08 else {
+                index += 1
+                continue
+            }
+            let slice = Array(buffer[index..<(index + 13)])
+            let checksum = slice[0..<12].reduce(UInt8(0)) { UInt8(($0 &+ $1) & 0xFF) }
+            guard checksum == slice[12] else {
+                index += 1
+                continue
+            }
+            frames.append(Frame(address: slice[1],
+                                command: slice[2],
+                                payload: Array(slice[4..<12])))
+            index += 13
+            lastConsumed = index
+        }
+        // Angefangene Rahmen aufheben – BLE liefert Antworten oft gestückelt.
+        let keepFrom = max(lastConsumed, max(0, buffer.count - 64))
+        return (frames, Array(buffer[keepFrom...]))
+    }
+
+    // MARK: - Modbus (D2)
+
+    /// Ein Lesekommando über alle interessanten Register.
+    static func modbusReadFrame(start: UInt16 = 0, count: UInt16 = 62) -> Data {
+        var frame: [UInt8] = [0xD2, 0x03,
+                              UInt8(start >> 8), UInt8(start & 0xFF),
+                              UInt8(count >> 8), UInt8(count & 0xFF)]
+        let crc = crc16Modbus(frame)
+        frame.append(UInt8(crc & 0xFF))
+        frame.append(UInt8(crc >> 8))
+        return Data(frame)
+    }
+
+    static func crc16Modbus(_ bytes: [UInt8]) -> UInt16 {
+        var crc: UInt16 = 0xFFFF
+        for byte in bytes {
+            crc ^= UInt16(byte)
+            for _ in 0..<8 {
+                if crc & 1 != 0 {
+                    crc = (crc >> 1) ^ 0xA001
+                } else {
+                    crc >>= 1
+                }
+            }
+        }
+        return crc
+    }
+
+    /// Prüft einen vollständigen Modbus-Antwortrahmen und liefert die
+    /// Registerwerte. Gibt nil zurück, solange der Rahmen unvollständig ist.
+    static func parseModbusResponse(_ buffer: [UInt8]) -> [UInt16]? {
+        guard buffer.count >= 5, buffer[0] == 0xD2, buffer[1] == 0x03 else { return nil }
+        let byteCount = Int(buffer[2])
+        let total = 3 + byteCount + 2
+        guard buffer.count >= total else { return nil }
+
+        let body = Array(buffer[0..<(3 + byteCount)])
+        let expected = crc16Modbus(body)
+        let actual = UInt16(buffer[3 + byteCount]) | (UInt16(buffer[4 + byteCount]) << 8)
+        guard expected == actual else { return nil }
+
+        var registers: [UInt16] = []
+        registers.reserveCapacity(byteCount / 2)
+        var i = 3
+        while i + 1 < 3 + byteCount {
+            registers.append(UInt16(body[i]) << 8 | UInt16(body[i + 1]))
+            i += 2
+        }
+        return registers
+    }
+}

CamperMonitor/Bluetooth/DalyState.swift

@@ -0,0 +1,214 @@
+import Foundation
+
+/// Sammelt die Antworten eines Daly-BMS. Das klassische Protokoll verteilt die
+/// Werte auf mehrere Rahmen, deshalb wird hier über Abfragerunden hinweg
+/// akkumuliert und erst am Ende ein Snapshot gebaut.
+struct DalyState {
+    var totalVoltage: Double?
+    var current: Double?
+    var soc: Double?
+
+    var maxCellMillivolts: Int?
+    var maxCellNumber: Int?
+    var minCellMillivolts: Int?
+    var minCellNumber: Int?
+
+    var maxTemperature: Double?
+    var minTemperature: Double?
+
+    var chargeMOSOn: Bool?
+    var dischargeMOSOn: Bool?
+    var chargeDischargeStatus: UInt8?
+    var remainingCapacityAh: Double?
+
+    var cellCount: Int?
+    var temperatureSensorCount: Int?
+    var cycles: Int?
+
+    /// Zellnummer (1-basiert) → Spannung in Millivolt.
+    var cellMillivolts: [Int: Int] = [:]
+    /// Sensornummer (1-basiert) → Temperatur in °C.
+    var sensorTemperatures: [Int: Double] = [:]
+
+    /// Letzte Rohantwort, für die Diagnoseansicht.
+    var lastRawResponse: Data?
+    var usesModbus = false
+
+    // MARK: - Klassisches Protokoll
+
+    mutating func apply(_ frame: DalyProtocol.Frame) {
+        let d = frame.payload
+        func u16(_ i: Int) -> Int { Int(d[i]) << 8 | Int(d[i + 1]) }
+
+        switch frame.command {
+        case 0x90:
+            totalVoltage = Double(u16(0)) * 0.1
+            // Strom mit Offset 30000, damit Entladung negativ dargestellt wird.
+            current = Double(u16(4) - 30000) * 0.1
+            soc = Double(u16(6)) * 0.1
+
+        case 0x91:
+            maxCellMillivolts = u16(0)
+            maxCellNumber = Int(d[2])
+            minCellMillivolts = u16(3)
+            minCellNumber = Int(d[5])
+
+        case 0x92:
+            maxTemperature = Double(Int(d[0]) - 40)
+            minTemperature = Double(Int(d[2]) - 40)
+
+        case 0x93:
+            chargeDischargeStatus = d[0]
+            chargeMOSOn = d[1] == 1
+            dischargeMOSOn = d[2] == 1
+            let capacityMilliAh = (UInt32(d[4]) << 24) | (UInt32(d[5]) << 16)
+                                | (UInt32(d[6]) << 8)  | UInt32(d[7])
+            remainingCapacityAh = Double(capacityMilliAh) / 1000
+
+        case 0x94:
+            cellCount = Int(d[0])
+            temperatureSensorCount = Int(d[1])
+            cycles = u16(6)
+
+        case 0x95:
+            // d[0] = Rahmennummer (1-basiert), danach drei Zellen à 2 Byte.
+            let frameNumber = Int(d[0])
+            guard frameNumber > 0 else { break }
+            for slot in 0..<3 {
+                let cell = (frameNumber - 1) * 3 + slot + 1
+                let millivolts = u16(1 + slot * 2)
+                if millivolts > 0 && millivolts < 6000 {
+                    cellMillivolts[cell] = millivolts
+                }
+            }
+
+        case 0x96:
+            let frameNumber = Int(d[0])
+            guard frameNumber > 0 else { break }
+            for slot in 0..<7 {
+                let sensor = (frameNumber - 1) * 7 + slot + 1
+                let raw = Int(d[1 + slot])
+                if raw != 0 {
+                    sensorTemperatures[sensor] = Double(raw - 40)
+                }
+            }
+
+        default:
+            break
+        }
+    }
+
+    // MARK: - Modbus-Protokoll
+
+    /// Registerbelegung der neueren Daly-BMS.
+    ///
+    /// Achtung: Dieses Mapping variiert zwischen Firmwareständen. Die
+    /// Detailansicht zeigt deshalb die Rohantwort an, damit sich die Belegung
+    /// am realen Gerät nachprüfen lässt.
+    mutating func apply(registers: [UInt16]) {
+        usesModbus = true
+        func reg(_ i: Int) -> UInt16? { i < registers.count ? registers[i] : nil }
+
+        // Register 0–47: Zellspannungen in mV, unbenutzte Plätze sind 0.
+        cellMillivolts.removeAll(keepingCapacity: true)
+        for i in 0..<min(48, registers.count) {
+            let millivolts = Int(registers[i])
+            if millivolts > 500 && millivolts < 5000 {
+                cellMillivolts[i + 1] = millivolts
+            }
+        }
+
+        // Register 48–55: Temperaturfühler mit Offset 40.
+        sensorTemperatures.removeAll(keepingCapacity: true)
+        for i in 48..<min(56, registers.count) {
+            let raw = Int(registers[i])
+            if raw > 0 && raw < 200 {
+                sensorTemperatures[i - 47] = Double(raw - 40)
+            }
+        }
+
+        if let v = reg(56), v > 0 { totalVoltage = Double(v) * 0.1 }
+        if let c = reg(57) { current = (Double(c) - 30000) * 0.1 }
+        if let s = reg(58), s <= 1000 { soc = Double(s) * 0.1 }
+
+        maxCellMillivolts = cellMillivolts.values.max()
+        minCellMillivolts = cellMillivolts.values.min()
+        maxCellNumber = cellMillivolts.max(by: { $0.value < $1.value })?.key
+        minCellNumber = cellMillivolts.min(by: { $0.value < $1.value })?.key
+        maxTemperature = sensorTemperatures.values.max()
+        minTemperature = sensorTemperatures.values.min()
+        cellCount = cellMillivolts.isEmpty ? nil : cellMillivolts.count
+        temperatureSensorCount = sensorTemperatures.isEmpty ? nil : sensorTemperatures.count
+    }
+
+    // MARK: - Ausgabe
+
+    var hasUsableData: Bool {
+        totalVoltage != nil || soc != nil || !cellMillivolts.isEmpty
+    }
+
+    func snapshot(deviceID: UUID, rssi: Int?) -> DeviceSnapshot {
+        var snapshot = DeviceSnapshot(deviceID: deviceID, timestamp: Date(), rssi: rssi)
+
+        var metrics: [Metric] = [
+            Metric("soc", "Ladezustand", soc, unit: "%", precision: 1, primary: true),
+            Metric("voltage", "Spannung", totalVoltage, unit: "V", precision: 2),
+            Metric("current", "Strom", current, unit: "A", precision: 1),
+        ]
+        if let v = totalVoltage, let a = current {
+            metrics.append(Metric("power", "Leistung", v * a, unit: "W", precision: 0))
+        }
+        if let capacity = remainingCapacityAh {
+            metrics.append(Metric("capacity", "Restkapazität", capacity, unit: "Ah", precision: 1))
+        }
+        if let maxV = maxCellMillivolts, let minV = minCellMillivolts {
+            metrics.append(Metric("cell_delta", "Zell-Differenz", Double(maxV - minV), unit: "mV", precision: 0))
+            metrics.append(Metric("cell_max", "Höchste Zelle" + numberSuffix(maxCellNumber),
+                                  Double(maxV) / 1000, unit: "V", precision: 3))
+            metrics.append(Metric("cell_min", "Niedrigste Zelle" + numberSuffix(minCellNumber),
+                                  Double(minV) / 1000, unit: "V", precision: 3))
+        }
+        if let maxTemperature {
+            metrics.append(Metric("temp_max", "Temperatur", maxTemperature, unit: "°C", precision: 0))
+        }
+        if let minTemperature, minTemperature != maxTemperature {
+            metrics.append(Metric("temp_min", "Temperatur min.", minTemperature, unit: "°C", precision: 0))
+        }
+        if let cycles {
+            metrics.append(Metric("cycles", "Ladezyklen", Double(cycles), unit: "", precision: 0))
+        }
+        snapshot.metrics = metrics
+
+        snapshot.state = stateText
+        snapshot.cellVoltages = cellMillivolts
+            .sorted { $0.key < $1.key }
+            .map { Double($0.value) / 1000 }
+        snapshot.temperatures = sensorTemperatures.sorted { $0.key < $1.key }.map(\.value)
+
+        var warnings: [String] = []
+        if chargeMOSOn == false { warnings.append("Lade-MOSFET aus") }
+        if dischargeMOSOn == false { warnings.append("Entlade-MOSFET aus") }
+        snapshot.offReasons = warnings
+
+        return snapshot
+    }
+
+    private func numberSuffix(_ number: Int?) -> String {
+        number.map { " (Zelle \($0))" } ?? ""
+    }
+
+    private var stateText: String? {
+        if let status = chargeDischargeStatus {
+            switch status {
+            case 0: return "Ruhend"
+            case 1: return "Lädt"
+            case 2: return "Entlädt"
+            default: break
+            }
+        }
+        guard let current else { return nil }
+        if current > 0.3 { return "Lädt" }
+        if current < -0.3 { return "Entlädt" }
+        return "Ruhend"
+    }
+}

CamperMonitor/Bluetooth/JBDProtocol.swift

@@ -0,0 +1,200 @@
+import Foundation
+
+/// Protokoll der JBD-/Xiaoxiang-BMS, wie sie unter anderem in WattCycle-Akkus
+/// verbaut sind. Bekannt auch als „Smart BMS“ oder Overkill-Solar-Protokoll.
+///
+/// Rahmenaufbau:
+///
+///     Anfrage:  DD A5 <Kommando> <Länge=00> <Prüfsumme 2 Byte> 77
+///     Antwort:  DD <Kommando> <Status> <Länge> <Daten…> <Prüfsumme 2 Byte> 77
+///
+/// Die Prüfsumme ist `0x10000 − (Status + Länge + Daten)`, big-endian; in der
+/// Anfrage entsprechend über Kommando und Länge.
+enum JBDProtocol {
+
+    enum Command: UInt8, CaseIterable {
+        case basicInfo    = 0x03
+        case cellVoltages = 0x04
+    }
+
+    static func requestFrame(_ command: Command) -> Data {
+        let checksum = checksum(over: [command.rawValue, 0x00])
+        return Data([0xDD, 0xA5, command.rawValue, 0x00,
+                     UInt8(checksum >> 8), UInt8(checksum & 0xFF), 0x77])
+    }
+
+    static func checksum(over bytes: [UInt8]) -> UInt16 {
+        let sum = bytes.reduce(UInt32(0)) { $0 + UInt32($1) }
+        return UInt16(truncatingIfNeeded: 0x1_0000 &- sum)
+    }
+
+    struct Frame {
+        let command: UInt8
+        let payload: [UInt8]
+    }
+
+    /// Sucht vollständige, prüfsummenkorrekte Rahmen im Puffer.
+    static func extractFrames(from buffer: [UInt8]) -> (frames: [Frame], remainder: [UInt8]) {
+        var frames: [Frame] = []
+        var index = 0
+        var consumed = 0
+
+        while index + 7 <= buffer.count {
+            guard buffer[index] == 0xDD else {
+                index += 1
+                continue
+            }
+            let length = Int(buffer[index + 3])
+            let total = 4 + length + 3          // Kopf + Daten + Prüfsumme + 0x77
+            guard index + total <= buffer.count else { break }   // Rest abwarten
+
+            let frame = Array(buffer[index..<(index + total)])
+            guard frame[total - 1] == 0x77 else {
+                index += 1
+                continue
+            }
+            let expected = checksum(over: Array(frame[2..<(4 + length)]))
+            let actual = UInt16(frame[4 + length]) << 8 | UInt16(frame[5 + length])
+            guard expected == actual else {
+                index += 1
+                continue
+            }
+            // Status ≠ 0 meldet einen Fehler; der Rahmen ist dann leer.
+            if frame[2] == 0x00 {
+                frames.append(Frame(command: frame[1],
+                                    payload: Array(frame[4..<(4 + length)])))
+            }
+            index += total
+            consumed = index
+        }
+        let keepFrom = max(consumed, max(0, buffer.count - 128))
+        return (frames, Array(buffer[keepFrom...]))
+    }
+
+    /// Klartext der Schutzabschaltungen aus der 16-Bit-Maske.
+    static func protectionReasons(_ mask: UInt16) -> [String] {
+        guard mask != 0 else { return [] }
+        let table: [(UInt16, String)] = [
+            (1 << 0,  "Zellüberspannung"),
+            (1 << 1,  "Zellunterspannung"),
+            (1 << 2,  "Batterie Überspannung"),
+            (1 << 3,  "Batterie Unterspannung"),
+            (1 << 4,  "Ladetemperatur zu hoch"),
+            (1 << 5,  "Ladetemperatur zu niedrig"),
+            (1 << 6,  "Entladetemperatur zu hoch"),
+            (1 << 7,  "Entladetemperatur zu niedrig"),
+            (1 << 8,  "Ladestrom zu hoch"),
+            (1 << 9,  "Entladestrom zu hoch"),
+            (1 << 10, "Kurzschluss"),
+            (1 << 11, "Fehler im Messkreis"),
+            (1 << 12, "MOSFET gesperrt"),
+        ]
+        return table.filter { mask & $0.0 != 0 }.map(\.1)
+    }
+}
+
+/// Sammelt die Antworten eines JBD-BMS.
+struct JBDState {
+    var totalVoltage: Double?
+    var current: Double?
+    var remainingCapacityAh: Double?
+    var nominalCapacityAh: Double?
+    var cycles: Int?
+    var soc: Double?
+    var chargeMOSOn: Bool?
+    var dischargeMOSOn: Bool?
+    var protections: [String] = []
+    var cellMillivolts: [Int] = []
+    var temperatures: [Double] = []
+
+    var hasUsableData: Bool { totalVoltage != nil || soc != nil || !cellMillivolts.isEmpty }
+
+    mutating func apply(_ frame: JBDProtocol.Frame) {
+        let d = frame.payload
+        func u16(_ i: Int) -> Int { Int(d[i]) << 8 | Int(d[i + 1]) }
+        func i16(_ i: Int) -> Int { Int(Int16(bitPattern: UInt16(u16(i)))) }
+
+        switch frame.command {
+        case 0x03:
+            guard d.count >= 23 else { return }
+            totalVoltage = Double(u16(0)) * 0.01          // 10 mV je Schritt
+            current = Double(i16(2)) * 0.01               // 10 mA, negativ = Entladung
+            remainingCapacityAh = Double(u16(4)) * 0.01
+            nominalCapacityAh = Double(u16(6)) * 0.01
+            cycles = u16(8)
+            protections = JBDProtocol.protectionReasons(UInt16(u16(16)))
+            soc = Double(d[19])
+            chargeMOSOn = d[20] & 0x01 != 0
+            dischargeMOSOn = d[20] & 0x02 != 0
+
+            // Ab Byte 23 folgen die NTC-Fühler, je zwei Byte in Zehntel-Kelvin.
+            let sensorCount = Int(d[22])
+            var readings: [Double] = []
+            for sensor in 0..<sensorCount {
+                let offset = 23 + sensor * 2
+                guard offset + 1 < d.count else { break }
+                readings.append((Double(u16(offset)) - 2731) / 10)
+            }
+            temperatures = readings
+
+        case 0x04:
+            var millivolts: [Int] = []
+            var offset = 0
+            while offset + 1 < d.count {
+                millivolts.append(u16(offset))
+                offset += 2
+            }
+            cellMillivolts = millivolts
+
+        default:
+            break
+        }
+    }
+
+    func snapshot(deviceID: UUID, rssi: Int?) -> DeviceSnapshot {
+        var snapshot = DeviceSnapshot(deviceID: deviceID, timestamp: Date(), rssi: rssi)
+
+        var metrics: [Metric] = [
+            Metric("soc", "Ladezustand", soc, unit: "%", precision: 0, primary: true),
+            Metric("voltage", "Spannung", totalVoltage, unit: "V", precision: 2),
+            Metric("current", "Strom", current, unit: "A", precision: 1),
+        ]
+        if let v = totalVoltage, let a = current {
+            metrics.append(Metric("power", "Leistung", v * a, unit: "W", precision: 0))
+        }
+        if let remainingCapacityAh {
+            metrics.append(Metric("capacity", "Restkapazität", remainingCapacityAh, unit: "Ah", precision: 1))
+        }
+        if let nominalCapacityAh {
+            metrics.append(Metric("capacity_nominal", "Nennkapazität", nominalCapacityAh, unit: "Ah", precision: 1))
+        }
+        if let maxV = cellMillivolts.max(), let minV = cellMillivolts.min() {
+            metrics.append(Metric("cell_delta", "Zell-Differenz", Double(maxV - minV), unit: "mV", precision: 0))
+            metrics.append(Metric("cell_max", "Höchste Zelle", Double(maxV) / 1000, unit: "V", precision: 3))
+            metrics.append(Metric("cell_min", "Niedrigste Zelle", Double(minV) / 1000, unit: "V", precision: 3))
+        }
+        if let warmest = temperatures.max() {
+            metrics.append(Metric("temp_max", "Temperatur", warmest, unit: "°C", precision: 0))
+        }
+        if let cycles {
+            metrics.append(Metric("cycles", "Ladezyklen", Double(cycles), unit: "", precision: 0))
+        }
+        snapshot.metrics = metrics
+
+        snapshot.cellVoltages = cellMillivolts.map { Double($0) / 1000 }
+        snapshot.temperatures = temperatures
+        snapshot.fault = protections.isEmpty ? nil : protections.joined(separator: ", ")
+
+        var notes: [String] = []
+        if chargeMOSOn == false { notes.append("Laden gesperrt") }
+        if dischargeMOSOn == false { notes.append("Entladen gesperrt") }
+        snapshot.offReasons = notes
+
+        if let current {
+            if current > 0.3 { snapshot.state = "Lädt" }
+            else if current < -0.3 { snapshot.state = "Entlädt" }
+            else { snapshot.state = "Ruhend" }
+        }
+        return snapshot
+    }
+}

CamperMonitor/Bluetooth/VictronAdvertisement.swift

@@ -0,0 +1,279 @@
+import Foundation
+
+/// Dekodiert die "Instant Readout"-Werbedaten von Victron-Geräten.
+///
+/// Aufbau der Herstellerdaten (inkl. der zwei Bytes Company-ID, die
+/// CoreBluetooth mitliefert):
+///
+///     [0..1]  E1 02        Company-ID 0x02E1 (Victron Energy)
+///     [2..3]  10 00        Record-Typ "Product Advertisement", 16 Bit
+///     [4..5]  ll hh        Produkt-ID, little-endian
+///     [6]     rr           Art des Datensatzes (Solarlader, DC/DC, …)
+///     [7..8]  ll hh        Nonce / Zähler, little-endian
+///     [9]     kk           Erstes Byte des Geräteschlüssels (Prüfbyte)
+///     [10..]               Mit AES-128-CTR verschlüsselte Nutzdaten
+///
+/// Die Aufteilung ist an einem Orion XS belegt: Datensatztyp 0x0F passt zum
+/// Gerät, das Prüfbyte zum hinterlegten Schlüssel, und die verbleibenden
+/// 14 Byte entsprechen genau der Länge eines Orion-XS-Datensatzes.
+///
+/// Der Schlüssel stammt aus VictronConnect
+/// (Gerät → Zahnrad → ⋮ → Produkt-Info → Verschlüsselungsdaten).
+enum VictronAdvertisement {
+
+    static let companyIdentifier: UInt16 = 0x02E1
+
+    enum RecordType: UInt8 {
+        case solarCharger       = 0x01
+        case batteryMonitor     = 0x02
+        case inverter           = 0x03
+        case dcdcConverter      = 0x04
+        case smartLithium       = 0x05
+        case inverterRS         = 0x06
+        case gxDevice           = 0x07
+        case acCharger          = 0x08
+        case smartBatteryProtect = 0x09
+        case lynxSmartBMS       = 0x0A
+        case multiRS            = 0x0B
+        case veBus              = 0x0C
+        case dcEnergyMeter      = 0x0D
+        case orionXS            = 0x0F
+    }
+
+    enum DecodeError: Error, LocalizedError {
+        case notVictron
+        case malformed
+        case keyMismatch(expected: UInt8, got: UInt8)
+        case decryptionFailed
+        case unsupportedRecord(UInt8)
+
+        var errorDescription: String? {
+            switch self {
+            case .notVictron:        return "Kein Victron-Advertisement"
+            case .malformed:         return "Advertisement zu kurz"
+            case .keyMismatch(let expected, let got):
+                return String(format: "Schlüssel passt nicht: Das Gerät sendet 0x%02X als erstes Byte, "
+                              + "der eingetragene Schlüssel beginnt mit 0x%02X.", expected, got)
+            case .decryptionFailed:  return "Entschlüsselung fehlgeschlagen"
+            case .unsupportedRecord(let r):
+                return String(format: "Datensatz-Typ 0x%02X wird nicht unterstützt", r)
+            }
+        }
+    }
+
+    /// Der unverschlüsselte Rahmen – lässt sich auch ohne Schlüssel lesen und
+    /// wird beim Einrichten benutzt, um Victron-Geräte zu erkennen.
+    struct Envelope {
+        let productID: UInt16
+        let recordType: UInt8
+        let nonce: UInt16
+        let keyCheckByte: UInt8
+        let ciphertext: [UInt8]
+
+        var knownRecord: RecordType? { RecordType(rawValue: recordType) }
+
+        var productIDText: String { String(format: "0x%04X", productID) }
+    }
+
+    static func envelope(from manufacturerData: Data) -> Envelope? {
+        let bytes = [UInt8](manufacturerData)
+        guard bytes.count >= 11 else { return nil }
+        let company = UInt16(bytes[0]) | (UInt16(bytes[1]) << 8)
+        guard company == companyIdentifier, bytes[2] == 0x10 else { return nil }
+        return Envelope(
+            productID: UInt16(bytes[4]) | (UInt16(bytes[5]) << 8),
+            recordType: bytes[6],
+            nonce: UInt16(bytes[7]) | (UInt16(bytes[8]) << 8),
+            keyCheckByte: bytes[9],
+            ciphertext: Array(bytes[10...])
+        )
+    }
+
+    /// Entschlüsselt und interpretiert ein Advertisement.
+    static func decode(manufacturerData: Data,
+                       key: [UInt8],
+                       deviceID: UUID,
+                       rssi: Int?) throws -> DeviceSnapshot {
+        guard let envelope = envelope(from: manufacturerData) else {
+            throw DecodeError.notVictron
+        }
+        guard key.count == 16 else { throw DecodeError.malformed }
+        guard key[0] == envelope.keyCheckByte else {
+            throw DecodeError.keyMismatch(expected: envelope.keyCheckByte, got: key[0])
+        }
+
+        // Zählerblock: Nonce little-endian in den ersten zwei Bytes, Rest null.
+        var counter = [UInt8](repeating: 0, count: 16)
+        counter[0] = UInt8(envelope.nonce & 0xFF)
+        counter[1] = UInt8(envelope.nonce >> 8)
+
+        guard let plain = AESCounterMode.crypt(envelope.ciphertext, key: key, nonce: counter) else {
+            throw DecodeError.decryptionFailed
+        }
+
+        var snapshot = DeviceSnapshot(deviceID: deviceID, timestamp: Date(), rssi: rssi)
+
+        switch envelope.knownRecord {
+        case .solarCharger:   fill(solarCharger: plain, into: &snapshot)
+        case .dcdcConverter:  fill(dcdcConverter: plain, into: &snapshot)
+        case .orionXS:        fill(orionXS: plain, into: &snapshot)
+        case .batteryMonitor: fill(batteryMonitor: plain, into: &snapshot)
+        case .acCharger:      fill(acCharger: plain, into: &snapshot)
+        default:              throw DecodeError.unsupportedRecord(envelope.recordType)
+        }
+        return snapshot
+    }
+
+    // MARK: - Datensätze
+
+    /// 0x01 – Solarladeregler (SmartSolar / BlueSolar MPPT).
+    private static func fill(solarCharger bytes: [UInt8], into snapshot: inout DeviceSnapshot) {
+        var r = BitReader(bytes)
+        let state = r.readOptional(8)
+        let error = r.readOptional(8)
+        let batteryVoltage = r.scaledSigned(16, 0.01)
+        let batteryCurrent = r.scaledSigned(16, 0.1)
+        let yieldToday = r.scaled(16, 0.01)
+        let pvPower = r.scaled(16, 1)
+        let loadCurrent = r.scaled(9, 0.1)
+
+        snapshot.state = VictronCodes.deviceState(state)
+        snapshot.fault = VictronCodes.chargerError(error)
+        snapshot.metrics = [
+            Metric("pv_power", "PV-Leistung", pvPower, unit: "W", precision: 0, primary: true),
+            Metric("battery_voltage", "Batteriespannung", batteryVoltage, unit: "V", precision: 2),
+            Metric("battery_current", "Ladestrom", batteryCurrent, unit: "A", precision: 1),
+            Metric("yield_today", "Ertrag heute", yieldToday, unit: "kWh", precision: 2),
+            Metric("load_current", "Laststrom", loadCurrent, unit: "A", precision: 1),
+        ]
+        if let v = batteryVoltage, let a = batteryCurrent {
+            snapshot.metrics.insert(
+                Metric("battery_power", "Ladeleistung", v * a, unit: "W", precision: 0), at: 1)
+        }
+    }
+
+    /// 0x04 – DC/DC-Wandler (Orion-TR Smart Ladebooster).
+    private static func fill(dcdcConverter bytes: [UInt8], into snapshot: inout DeviceSnapshot) {
+        var r = BitReader(bytes)
+        let state = r.readOptional(8)
+        let error = r.readOptional(8)
+        let inputVoltage = r.scaled(16, 0.01)
+        let outputVoltage = r.scaledSigned(16, 0.01)
+        let offReason = r.readOptional(32)
+
+        snapshot.state = VictronCodes.deviceState(state)
+        snapshot.fault = VictronCodes.chargerError(error)
+        snapshot.offReasons = VictronCodes.offReasons(offReason)
+        snapshot.metrics = [
+            Metric("output_voltage", "Ausgang (Aufbaubatterie)", outputVoltage, unit: "V", precision: 2, primary: true),
+            Metric("input_voltage", "Eingang (Starterbatterie)", inputVoltage, unit: "V", precision: 2),
+        ]
+    }
+
+    /// 0x0F – Orion XS. Sendet im Gegensatz zum Orion-TR auch Ströme.
+    private static func fill(orionXS bytes: [UInt8], into snapshot: inout DeviceSnapshot) {
+        var r = BitReader(bytes)
+        let state = r.readOptional(8)
+        let error = r.readOptional(8)
+        let outputVoltage = r.scaled(16, 0.01)
+        let outputCurrent = r.scaledSigned(16, 0.1)
+        let inputVoltage = r.scaled(16, 0.01)
+        let inputCurrent = r.scaledSigned(16, 0.1)
+        let offReason = r.readOptional(32)
+
+        snapshot.state = VictronCodes.deviceState(state)
+        snapshot.fault = VictronCodes.chargerError(error)
+        snapshot.offReasons = VictronCodes.offReasons(offReason)
+
+        var metrics: [Metric] = []
+        if let v = outputVoltage, let a = outputCurrent {
+            metrics.append(Metric("output_power", "Ladeleistung", v * a, unit: "W", precision: 0, primary: true))
+        }
+        metrics += [
+            Metric("output_voltage", "Ausgang (Aufbaubatterie)", outputVoltage, unit: "V", precision: 2,
+                   primary: outputCurrent == nil),
+            Metric("output_current", "Ladestrom", outputCurrent, unit: "A", precision: 1),
+            Metric("input_voltage", "Eingang (Starterbatterie)", inputVoltage, unit: "V", precision: 2),
+            Metric("input_current", "Eingangsstrom", inputCurrent, unit: "A", precision: 1),
+        ]
+        snapshot.metrics = metrics
+    }
+
+    /// 0x08 – AC-Ladegerät (Blue Smart IP65/IP22), falls im Camper verbaut.
+    private static func fill(acCharger bytes: [UInt8], into snapshot: inout DeviceSnapshot) {
+        var r = BitReader(bytes)
+        let state = r.readOptional(8)
+        let error = r.readOptional(8)
+        let voltage1 = r.scaled(13, 0.01)
+        let current1 = r.scaled(11, 0.1)
+        let voltage2 = r.scaled(13, 0.01)
+        let current2 = r.scaled(11, 0.1)
+        let voltage3 = r.scaled(13, 0.01)
+        let current3 = r.scaled(11, 0.1)
+        let temperature = r.scaled(7, 1)
+        let acCurrent = r.scaled(9, 0.1)
+
+        snapshot.state = VictronCodes.deviceState(state)
+        snapshot.fault = VictronCodes.chargerError(error)
+        snapshot.metrics = [
+            Metric("out1_voltage", "Ausgang 1 Spannung", voltage1, unit: "V", precision: 2, primary: true),
+            Metric("out1_current", "Ausgang 1 Strom", current1, unit: "A", precision: 1),
+            Metric("out2_voltage", "Ausgang 2 Spannung", voltage2, unit: "V", precision: 2),
+            Metric("out2_current", "Ausgang 2 Strom", current2, unit: "A", precision: 1),
+            Metric("out3_voltage", "Ausgang 3 Spannung", voltage3, unit: "V", precision: 2),
+            Metric("out3_current", "Ausgang 3 Strom", current3, unit: "A", precision: 1),
+            Metric("ac_current", "AC-Eingangsstrom", acCurrent, unit: "A", precision: 1),
+        ]
+        if let temperature {
+            snapshot.temperatures = [temperature - 40]
+        }
+    }
+
+    /// 0x02 – Batteriewächter (SmartShunt, BMV).
+    private static func fill(batteryMonitor bytes: [UInt8], into snapshot: inout DeviceSnapshot) {
+        var r = BitReader(bytes)
+        let timeToGo = r.scaled(16, 1)              // Minuten
+        let voltage = r.scaledSigned(16, 0.01)
+        let alarm = r.readOptional(16)
+        let auxRaw = r.read(16)
+        let auxType = r.read(2)
+        let current = r.scaledSigned(22, 0.001)
+        let consumedAh = r.scaled(20, 0.1)
+        let soc = r.scaled(10, 0.1)
+
+        snapshot.state = nil
+        let alarms = VictronCodes.alarmReasons(alarm)
+        snapshot.fault = alarms.isEmpty ? nil : alarms.joined(separator: ", ")
+
+        var metrics: [Metric] = [
+            Metric("soc", "Ladezustand", soc, unit: "%", precision: 1, primary: true),
+            Metric("voltage", "Spannung", voltage, unit: "V", precision: 2),
+            Metric("current", "Strom", current, unit: "A", precision: 2),
+        ]
+        if let v = voltage, let a = current {
+            metrics.append(Metric("power", "Leistung", v * a, unit: "W", precision: 0))
+        }
+        // Entnommene Kapazität wird positiv gesendet, ist aber eine Entnahme.
+        metrics.append(Metric("consumed", "Entnommen", consumedAh.map { -$0 }, unit: "Ah", precision: 1))
+        if let timeToGo, timeToGo < 65535 {
+            metrics.append(Metric("ttg", "Restlaufzeit", timeToGo / 60, unit: "h", precision: 1))
+        }
+
+        // Der Hilfseingang ist je nach Konfiguration Starterbatterie,
+        // Mittenspannung oder Temperatur.
+        if let auxRaw, let auxType, auxRaw != 0xFFFF {
+            switch auxType {
+            case 0:
+                let starter = Double(Int16(bitPattern: UInt16(auxRaw))) * 0.01
+                metrics.append(Metric("aux_starter", "Starterbatterie", starter, unit: "V", precision: 2))
+            case 1:
+                metrics.append(Metric("aux_mid", "Mittenspannung", Double(auxRaw) * 0.01, unit: "V", precision: 2))
+            case 2:
+                snapshot.temperatures = [Double(auxRaw) * 0.01 - 273.15]
+            default:
+                break
+            }
+        }
+        snapshot.metrics = metrics
+    }
+}

CamperMonitor/CamperMonitorApp.swift

@@ -0,0 +1,31 @@
+import SwiftUI
+
+@main
+struct CamperMonitorApp: App {
+    @State private var store: DeviceStore
+    @State private var bluetooth: BluetoothManager
+    @Environment(\.scenePhase) private var scenePhase
+
+    init() {
+        let store = DeviceStore()
+        _store = State(initialValue: store)
+        _bluetooth = State(initialValue: BluetoothManager(store: store))
+    }
+
+    var body: some Scene {
+        WindowGroup {
+            DashboardView()
+                .environment(store)
+                .environment(bluetooth)
+        }
+        .onChange(of: scenePhase) { _, phase in
+            // Im Hintergrund darf ohne Service-Filter ohnehin nicht gescannt
+            // werden, also Funk sparen und beim Zurückkommen neu starten.
+            switch phase {
+            case .active:     bluetooth.start()
+            case .background: bluetooth.stop()
+            default:          break
+            }
+        }
+    }
+}

CamperMonitor/Models/ConfiguredDevice.swift

@@ -0,0 +1,85 @@
+import Foundation
+
+/// Welche Rolle ein Gerät im Camper spielt. Bestimmt Icon, Sortierung und
+/// welche Kennzahl als "Hauptwert" auf der Kachel gross dargestellt wird.
+enum DeviceRole: String, Codable, CaseIterable, Identifiable, Sendable {
+    case chargeBooster
+    case solarCharger
+    case batteryMonitor
+    case bms
+
+    var id: String { rawValue }
+
+    var title: String {
+        switch self {
+        case .chargeBooster:  return "Ladebooster"
+        case .solarCharger:   return "Solarladeregler"
+        case .batteryMonitor: return "Batteriemonitor"
+        case .bms:            return "Batterie / BMS"
+        }
+    }
+
+    var symbol: String {
+        switch self {
+        case .chargeBooster:  return "bolt.car"
+        case .solarCharger:   return "sun.max"
+        case .batteryMonitor: return "gauge.with.dots.needle.bottom.50percent"
+        case .bms:            return "battery.100percent.bolt"
+        }
+    }
+
+    /// Victron-Geräte werden passiv über das Advertisement gelesen, das Daly BMS
+    /// braucht eine echte GATT-Verbindung.
+    var transport: DeviceTransport {
+        self == .bms ? .connect : .advertisement
+    }
+}
+
+enum DeviceTransport: Sendable {
+    /// Passives Mitlesen der BLE-Werbedaten (Victron Instant Readout).
+    case advertisement
+    /// Verbindungsaufbau, Kommando schreiben, Antwort per Notify lesen (Daly).
+    case connect
+}
+
+/// Ein vom Nutzer eingerichtetes Gerät. Der Victron-Schlüssel liegt nicht hier,
+/// sondern in der Keychain (siehe `KeychainStore`).
+struct ConfiguredDevice: Identifiable, Codable, Hashable, Sendable {
+    var id: UUID
+    var name: String
+    var role: DeviceRole
+    /// Zu welchem Fahrzeug das Gerät gehört.
+    var profileID: UUID
+    /// CoreBluetooth-Identifier des Peripherals. Pro iPhone stabil, aber nicht
+    /// geräteübergreifend – deshalb wird beim Einrichten neu gescannt.
+    var peripheralID: UUID
+    /// Zuletzt gesehener Advertised Name, nur zur Wiedererkennung in der UI.
+    var advertisedName: String?
+
+    init(id: UUID = UUID(),
+         name: String,
+         role: DeviceRole,
+         profileID: UUID,
+         peripheralID: UUID,
+         advertisedName: String? = nil) {
+        self.id = id
+        self.name = name
+        self.role = role
+        self.profileID = profileID
+        self.peripheralID = peripheralID
+        self.advertisedName = advertisedName
+    }
+
+    /// Geräte, die vor der Profilverwaltung angelegt wurden, haben noch keine
+    /// Zuordnung – die landen im Standardprofil.
+    init(from decoder: Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        id = try container.decode(UUID.self, forKey: .id)
+        name = try container.decode(String.self, forKey: .name)
+        role = try container.decode(DeviceRole.self, forKey: .role)
+        profileID = try container.decodeIfPresent(UUID.self, forKey: .profileID)
+            ?? Profile.defaultID
+        peripheralID = try container.decode(UUID.self, forKey: .peripheralID)
+        advertisedName = try container.decodeIfPresent(String.self, forKey: .advertisedName)
+    }
+}

CamperMonitor/Models/DeviceSnapshot.swift

@@ -0,0 +1,89 @@
+import Foundation
+
+/// Eine einzelne Messgrösse in einer bereits formatierten Form.
+struct Metric: Identifiable, Hashable, Sendable {
+    let key: String
+    let label: String
+    let value: Double?
+    let unit: String
+    /// Nachkommastellen für die Anzeige.
+    let precision: Int
+    /// Wird auf der Kachel gross dargestellt.
+    let isPrimary: Bool
+
+    var id: String { key }
+
+    init(_ key: String,
+         _ label: String,
+         _ value: Double?,
+         unit: String,
+         precision: Int = 2,
+         primary: Bool = false) {
+        self.key = key
+        self.label = label
+        self.value = value
+        self.unit = unit
+        self.precision = precision
+        self.isPrimary = primary
+    }
+
+    var formatted: String {
+        guard let value else { return "–" }
+        return String(format: "%.\(precision)f", value)
+    }
+
+    var formattedWithUnit: String {
+        guard value != nil else { return "–" }
+        return unit.isEmpty ? formatted : "\(formatted) \(unit)"
+    }
+}
+
+/// Der komplette, zuletzt empfangene Zustand eines Geräts.
+struct DeviceSnapshot: Identifiable, Sendable {
+    var id: UUID { deviceID }
+    var deviceID: UUID
+    var timestamp: Date
+    var metrics: [Metric] = []
+    /// z.B. "Bulk", "Float", "Aus"
+    var state: String?
+    /// Klartext einer aktiven Störung, sonst nil.
+    var fault: String?
+    /// Grund, warum das Gerät gerade nicht lädt (Victron Off-Reason).
+    var offReasons: [String] = []
+    var rssi: Int?
+    /// Einzelzellspannungen in Volt (nur BMS).
+    var cellVoltages: [Double] = []
+    /// Temperaturfühler in °C (nur BMS).
+    var temperatures: [Double] = []
+
+    var primaryMetric: Metric? {
+        metrics.first(where: \.isPrimary) ?? metrics.first
+    }
+
+    var age: TimeInterval { Date().timeIntervalSince(timestamp) }
+
+    /// Werte älter als eine Minute gelten als veraltet – Victron sendet etwa
+    /// jede Sekunde, das Daly wird alle paar Sekunden gepollt.
+    var isStale: Bool { age > 60 }
+}
+
+/// Verbindungszustand für die UI.
+enum DeviceLinkState: Equatable, Sendable {
+    case idle
+    case searching
+    case connecting
+    case live
+    case needsKey
+    case failed(String)
+
+    var label: String {
+        switch self {
+        case .idle:        return "Inaktiv"
+        case .searching:   return "Suche…"
+        case .connecting:  return "Verbinde…"
+        case .live:        return "Live"
+        case .needsKey:    return "Schlüssel fehlt"
+        case .failed(let m): return m
+        }
+    }
+}

CamperMonitor/Models/Profile.swift

@@ -0,0 +1,32 @@
+import Foundation
+
+/// Ein Fahrzeug. Jedes Profil hat seinen eigenen Satz Geräte; die App zeigt und
+/// funkt immer nur für das gerade gewählte.
+struct Profile: Identifiable, Codable, Hashable, Sendable {
+    var id: UUID
+    var name: String
+    /// SF-Symbol für die Auswahl im Dashboard.
+    var symbol: String
+
+    init(id: UUID = UUID(), name: String, symbol: String = "box.truck") {
+        self.id = id
+        self.name = name
+        self.symbol = symbol
+    }
+
+    /// Profil, dem Geräte aus der Zeit vor der Profilverwaltung zugeordnet
+    /// werden. Feste Kennung, damit die Zuordnung beim Update erhalten bleibt.
+    static let defaultID = UUID(uuidString: "00000000-0000-0000-0000-00000000C001")!
+
+    static var initial: Profile {
+        Profile(id: defaultID, name: "Mein Camper")
+    }
+
+    /// Auswahl für die Profilbearbeitung.
+    /// Alle Namen gegen NSImage(systemSymbolName:) geprüft – ein nicht
+    /// existierendes Symbol lässt SwiftUI stillschweigend auf Text zurückfallen.
+    static let symbols = [
+        "box.truck", "truck.pickup.side", "bus", "bus.doubledecker",
+        "car", "car.side", "tent", "sailboat", "house.lodge", "mountain.2",
+    ]
+}

CamperMonitor/Models/VictronCodes.swift

@@ -0,0 +1,101 @@
+import Foundation
+
+/// Klartexte für die Zustands- und Fehlercodes aus den Victron-Werbedaten.
+enum VictronCodes {
+
+    /// VE.Reg 0x0201 – Betriebszustand des Laders.
+    static func deviceState(_ code: UInt32?) -> String? {
+        guard let code else { return nil }
+        switch code {
+        case 0:   return "Aus"
+        case 1:   return "Stromsparmodus"
+        case 2:   return "Störung"
+        case 3:   return "Konstantstrom (Bulk)"
+        case 4:   return "Konstantspannung (Absorption)"
+        case 5:   return "Erhaltung (Float)"
+        case 6:   return "Lagerung"
+        case 7:   return "Ausgleichsladung"
+        case 9:   return "Wechselrichten"
+        case 11:  return "Netzteilbetrieb"
+        case 245: return "Startet"
+        case 246: return "Wiederholte Absorption"
+        case 247: return "Auto-Ausgleich"
+        case 248: return "Battery Safe"
+        case 252: return "Externe Steuerung"
+        default:  return "Zustand \(code)"
+        }
+    }
+
+    /// VE.Reg 0xEDDA – Ladefehler. 0 bedeutet "kein Fehler".
+    static func chargerError(_ code: UInt32?) -> String? {
+        guard let code, code != 0 else { return nil }
+        switch code {
+        case 1:   return "Batterietemperatur zu hoch"
+        case 2:   return "Batteriespannung zu hoch"
+        case 3:   return "Temperatursensor defekt"
+        case 4:   return "Temperatursensor Kurzschluss"
+        case 5:   return "Temperatursensor unplausibel"
+        case 6:   return "Spannungsmessung defekt"
+        case 7:   return "Spannungsmessung Kurzschluss"
+        case 8:   return "Spannungsmessung unplausibel"
+        case 11:  return "Zu hohe Restwelligkeit"
+        case 14:  return "Batterietemperatur zu niedrig"
+        case 17:  return "Lader überhitzt"
+        case 18:  return "Lader Überstrom"
+        case 19:  return "Stromrichtung verkehrt"
+        case 20:  return "Bulk-Zeit überschritten"
+        case 21:  return "Stromsensor defekt"
+        case 22:  return "Interner Temperatursensor defekt"
+        case 26:  return "Anschlussklemme überhitzt"
+        case 27:  return "Kurzschluss im Lader"
+        case 28:  return "Endstufenfehler"
+        case 29:  return "Überladeschutz"
+        case 33:  return "Eingangsspannung zu hoch (PV)"
+        case 34:  return "Eingangsstrom zu hoch (PV)"
+        case 38:  return "Eingang abgeschaltet (Batteriespannung)"
+        case 39:  return "Eingang abgeschaltet (Stromfluss)"
+        case 65:  return "Kommunikation verloren"
+        case 66:  return "Konfiguration synchronisierter Lader fehlerhaft"
+        case 67:  return "BMS-Verbindung verloren"
+        case 68:  return "Netzwerk fehlkonfiguriert"
+        case 116: return "Kalibrierdaten verloren"
+        case 117: return "Inkompatible Firmware"
+        case 119: return "Einstellungen ungültig"
+        default:  return "Fehler \(code)"
+        }
+    }
+
+    /// VE.Reg 0x0207 – Bitmaske, warum das Gerät gerade nicht arbeitet.
+    static func offReasons(_ mask: UInt32?) -> [String] {
+        guard let mask, mask != 0 else { return [] }
+        let table: [(UInt32, String)] = [
+            (0x0000_0001, "Keine Eingangsspannung"),
+            (0x0000_0002, "Per Schalter ausgeschaltet"),
+            (0x0000_0004, "Per Einstellung ausgeschaltet"),
+            (0x0000_0008, "Remote-Eingang"),
+            (0x0000_0010, "Schutzfunktion aktiv"),
+            (0x0000_0020, "Paygo"),
+            (0x0000_0040, "BMS"),
+            (0x0000_0080, "Motor-Abschalterkennung"),
+            (0x0000_0100, "Eingangsspannung wird geprüft"),
+        ]
+        return table.filter { mask & $0.0 != 0 }.map(\.1)
+    }
+
+    /// VE.Reg 0xEEB8 – Alarmgründe des Batteriewächters.
+    static func alarmReasons(_ mask: UInt32?) -> [String] {
+        guard let mask, mask != 0 else { return [] }
+        let table: [(UInt32, String)] = [
+            (0x0001, "Unterspannung"),
+            (0x0002, "Überspannung"),
+            (0x0004, "Niedriger Ladezustand"),
+            (0x0008, "Starterbatterie Unterspannung"),
+            (0x0010, "Starterbatterie Überspannung"),
+            (0x0020, "Temperatur zu niedrig"),
+            (0x0040, "Temperatur zu hoch"),
+            (0x0080, "Mittenspannung"),
+            (0x0100, "Ladung überfällig"),
+        ]
+        return table.filter { mask & $0.0 != 0 }.map(\.1)
+    }
+}

CamperMonitor/Store/DemoData.swift

@@ -0,0 +1,110 @@
+import Foundation
+
+/// Füllt die App mit erfundenen Messwerten, damit sich die Ansichten ohne
+/// Fahrzeug und ohne Bluetooth prüfen lassen.
+///
+/// Nur in Debug-Builds und nur, wenn beim Start `CAMPER_DEMO=1` gesetzt ist:
+///
+///     xcrun simctl launch --terminate-running-process \
+///         booted de.fritob.CamperMonitor
+///     # mit: SIMCTL_CHILD_CAMPER_DEMO=1 davor
+///
+/// Im normalen Betrieb wird hiervon nichts ausgeführt.
+enum DemoData {
+
+    static var isEnabled: Bool {
+        #if DEBUG
+        return ProcessInfo.processInfo.environment["CAMPER_DEMO"] == "1"
+        #else
+        return false
+        #endif
+    }
+
+    static let mainProfile = Profile(id: Profile.defaultID, name: "Kastenwagen", symbol: "box.truck")
+    static let secondProfile = Profile(
+        id: UUID(uuidString: "00000000-0000-0000-0000-0000000000C2")!,
+        name: "Wohnwagen", symbol: "caravan")
+
+    static var profiles: [Profile] { [mainProfile, secondProfile] }
+
+    static let booster = ConfiguredDevice(
+        id: UUID(uuidString: "00000000-0000-0000-0000-0000000000B0")!,
+        name: "Ladebooster", role: .chargeBooster, profileID: Profile.defaultID,
+        peripheralID: UUID(uuidString: "00000000-0000-0000-0000-0000000000B1")!)
+
+    static let solar = ConfiguredDevice(
+        id: UUID(uuidString: "00000000-0000-0000-0000-000000000050")!,
+        name: "Solar Dach", role: .solarCharger, profileID: Profile.defaultID,
+        peripheralID: UUID(uuidString: "00000000-0000-0000-0000-000000000051")!)
+
+    static let battery = ConfiguredDevice(
+        id: UUID(uuidString: "00000000-0000-0000-0000-0000000000A0")!,
+        name: "Bulltron 200 Ah", role: .bms, profileID: Profile.defaultID,
+        peripheralID: UUID(uuidString: "00000000-0000-0000-0000-0000000000A1")!)
+
+    static let caravanSolar = ConfiguredDevice(
+        id: UUID(uuidString: "00000000-0000-0000-0000-0000000000C3")!,
+        name: "Solar Wohnwagen", role: .solarCharger, profileID: secondProfile.id,
+        peripheralID: UUID(uuidString: "00000000-0000-0000-0000-0000000000C4")!)
+
+    static var devices: [ConfiguredDevice] { [solar, booster, battery, caravanSolar] }
+
+    static func snapshots() -> [DeviceSnapshot] {
+        var solarSnapshot = DeviceSnapshot(deviceID: solar.id, timestamp: Date(), rssi: -58)
+        solarSnapshot.state = "Konstantspannung (Absorption)"
+        solarSnapshot.metrics = [
+            Metric("pv_power", "PV-Leistung", 284, unit: "W", precision: 0, primary: true),
+            Metric("battery_power", "Ladeleistung", 262, unit: "W", precision: 0),
+            Metric("battery_voltage", "Batteriespannung", 14.12, unit: "V", precision: 2),
+            Metric("battery_current", "Ladestrom", 18.6, unit: "A", precision: 1),
+            Metric("yield_today", "Ertrag heute", 1.34, unit: "kWh", precision: 2),
+        ]
+
+        var boosterSnapshot = DeviceSnapshot(deviceID: booster.id, timestamp: Date(), rssi: -71)
+        boosterSnapshot.state = "Aus"
+        boosterSnapshot.offReasons = ["Keine Eingangsspannung"]
+        boosterSnapshot.metrics = [
+            Metric("output_voltage", "Ausgang (Aufbaubatterie)", 14.09, unit: "V", precision: 2, primary: true),
+            Metric("input_voltage", "Eingang (Starterbatterie)", 12.42, unit: "V", precision: 2),
+        ]
+
+        let cells = [3.412, 3.418, 3.409, 3.421]
+        var batterySnapshot = DeviceSnapshot(deviceID: battery.id, timestamp: Date(), rssi: -64)
+        batterySnapshot.state = "Lädt"
+        batterySnapshot.cellVoltages = cells
+        batterySnapshot.temperatures = [21, 22]
+        batterySnapshot.metrics = [
+            Metric("soc", "Ladezustand", 78.4, unit: "%", precision: 1, primary: true),
+            Metric("voltage", "Spannung", 13.66, unit: "V", precision: 2),
+            Metric("current", "Strom", 18.6, unit: "A", precision: 1),
+            Metric("power", "Leistung", 254, unit: "W", precision: 0),
+            Metric("capacity", "Restkapazität", 156.8, unit: "Ah", precision: 1),
+            Metric("cell_delta", "Zell-Differenz", 12, unit: "mV", precision: 0),
+            Metric("cell_max", "Höchste Zelle (Zelle 4)", 3.421, unit: "V", precision: 3),
+            Metric("cell_min", "Niedrigste Zelle (Zelle 3)", 3.409, unit: "V", precision: 3),
+            Metric("temp_max", "Temperatur", 22, unit: "°C", precision: 0),
+            Metric("cycles", "Ladezyklen", 143, unit: "", precision: 0),
+        ]
+
+        var caravanSnapshot = DeviceSnapshot(deviceID: caravanSolar.id, timestamp: Date(), rssi: -77)
+        caravanSnapshot.state = "Erhaltung (Float)"
+        caravanSnapshot.metrics = [
+            Metric("pv_power", "PV-Leistung", 62, unit: "W", precision: 0, primary: true),
+            Metric("battery_voltage", "Batteriespannung", 13.62, unit: "V", precision: 2),
+            Metric("battery_current", "Ladestrom", 4.4, unit: "A", precision: 1),
+        ]
+
+        return [solarSnapshot, boosterSnapshot, batterySnapshot, caravanSnapshot]
+    }
+
+    /// Ein paar Stunden Verlauf, damit die Grafik etwas zeigt.
+    static func history(for deviceID: UUID, around value: Double) -> [HistorySample] {
+        let now = Date()
+        return (0..<80).reversed().map { step in
+            let t = Double(step)
+            let wave = sin(t / 9) * value * 0.18 + cos(t / 23) * value * 0.07
+            return HistorySample(time: now.addingTimeInterval(-t * 60),
+                                 value: max(0, value + wave))
+        }
+    }
+}

CamperMonitor/Store/DeviceStore.swift

@@ -0,0 +1,184 @@
+import Foundation
+import Observation
+
+/// Verwaltet die Fahrzeugprofile, die darin eingerichteten Geräte und deren
+/// Schlüssel.
+@Observable
+final class DeviceStore {
+
+    private static let devicesKey = "configuredDevices"
+    private static let profilesKey = "profiles"
+    private static let activeProfileKey = "activeProfileID"
+
+    /// Alle Geräte über alle Profile hinweg.
+    private(set) var devices: [ConfiguredDevice] = []
+    private(set) var profiles: [Profile] = []
+
+    private(set) var activeProfileID: UUID = Profile.defaultID
+
+    /// Zwischenspeicher, damit nicht bei jedem Advertisement die Keychain
+    /// befragt wird – das passiert bis zu mehrmals pro Sekunde.
+    @ObservationIgnored private var keyCache: [UUID: [UInt8]] = [:]
+
+    init() {
+        if DemoData.isEnabled {
+            profiles = DemoData.profiles
+            devices = DemoData.devices
+            activeProfileID = DemoData.profiles[0].id
+            return
+        }
+        load()
+    }
+
+    // MARK: - Profile
+
+    var activeProfile: Profile? {
+        profiles.first { $0.id == activeProfileID }
+    }
+
+    /// Die Geräte des gewählten Fahrzeugs.
+    var activeDevices: [ConfiguredDevice] {
+        devices.filter { $0.profileID == activeProfileID }
+    }
+
+    var hasMultipleProfiles: Bool { profiles.count > 1 }
+
+    func selectProfile(_ profile: Profile) {
+        guard profile.id != activeProfileID else { return }
+        activeProfileID = profile.id
+        save()
+    }
+
+    @discardableResult
+    func addProfile(named name: String, symbol: String = "box.truck") -> Profile {
+        let profile = Profile(name: name, symbol: symbol)
+        profiles.append(profile)
+        save()
+        return profile
+    }
+
+    func update(_ profile: Profile) {
+        guard let index = profiles.firstIndex(where: { $0.id == profile.id }) else { return }
+        profiles[index] = profile
+        save()
+    }
+
+    /// Entfernt ein Profil samt seiner Geräte und Schlüssel. Das letzte Profil
+    /// bleibt bestehen – ohne Profil hätte die App keinen Ort für Geräte.
+    func removeProfile(_ profile: Profile) {
+        guard profiles.count > 1 else { return }
+        for device in devices where device.profileID == profile.id {
+            KeychainStore.setKey(nil, for: device.id)
+            keyCache[device.id] = nil
+        }
+        devices.removeAll { $0.profileID == profile.id }
+        profiles.removeAll { $0.id == profile.id }
+        if activeProfileID == profile.id, let first = profiles.first {
+            activeProfileID = first.id
+        }
+        save()
+    }
+
+    func deviceCount(in profile: Profile) -> Int {
+        devices.count { $0.profileID == profile.id }
+    }
+
+    // MARK: - Geräte
+
+    /// Legt ein Gerät im gerade gewählten Profil an.
+    func add(_ device: ConfiguredDevice, victronKey: String? = nil) {
+        devices.append(device)
+        if let victronKey {
+            setVictronKey(victronKey, for: device.id)
+        }
+        save()
+    }
+
+    func update(_ device: ConfiguredDevice) {
+        guard let index = devices.firstIndex(where: { $0.id == device.id }) else { return }
+        devices[index] = device
+        save()
+    }
+
+    func remove(_ device: ConfiguredDevice) {
+        devices.removeAll { $0.id == device.id }
+        KeychainStore.setKey(nil, for: device.id)
+        keyCache[device.id] = nil
+        save()
+    }
+
+    /// Nur im aktiven Profil suchen: die Geräte des anderen Fahrzeugs sollen
+    /// weder gelesen noch verbunden werden.
+    func device(withPeripheralID id: UUID) -> ConfiguredDevice? {
+        activeDevices.first { $0.peripheralID == id }
+    }
+
+    // MARK: - Victron-Schlüssel
+
+    func victronKeyText(for deviceID: UUID) -> String? {
+        KeychainStore.key(for: deviceID)
+    }
+
+    func setVictronKey(_ hex: String?, for deviceID: UUID) {
+        let trimmed = hex?.trimmingCharacters(in: .whitespacesAndNewlines)
+        let value = (trimmed?.isEmpty ?? true) ? nil : trimmed
+        KeychainStore.setKey(value, for: deviceID)
+        keyCache[deviceID] = value?.hexBytes
+    }
+
+    /// Der Schlüssel als Bytes, oder nil wenn keiner hinterlegt bzw. der
+    /// hinterlegte keine 16 Byte lang ist.
+    func victronKeyBytes(for deviceID: UUID) -> [UInt8]? {
+        if let cached = keyCache[deviceID] { return cached }
+        guard let bytes = KeychainStore.key(for: deviceID)?.hexBytes, bytes.count == 16 else {
+            return nil
+        }
+        keyCache[deviceID] = bytes
+        return bytes
+    }
+
+    // MARK: - Persistenz
+
+    private func load() {
+        let defaults = UserDefaults.standard
+
+        if let data = defaults.data(forKey: Self.profilesKey),
+           let decoded = try? JSONDecoder().decode([Profile].self, from: data),
+           !decoded.isEmpty {
+            profiles = decoded
+        } else {
+            // Erster Start oder Update von einer Version ohne Profile.
+            profiles = [.initial]
+        }
+
+        if let data = defaults.data(forKey: Self.devicesKey),
+           let decoded = try? JSONDecoder().decode([ConfiguredDevice].self, from: data) {
+            devices = decoded
+        }
+
+        if let raw = defaults.string(forKey: Self.activeProfileKey),
+           let id = UUID(uuidString: raw),
+           profiles.contains(where: { $0.id == id }) {
+            activeProfileID = id
+        } else {
+            activeProfileID = profiles[0].id
+        }
+
+        // Geräte, deren Profil nicht mehr existiert, wären sonst unerreichbar.
+        let known = Set(profiles.map(\.id))
+        for index in devices.indices where !known.contains(devices[index].profileID) {
+            devices[index].profileID = profiles[0].id
+        }
+    }
+
+    private func save() {
+        let defaults = UserDefaults.standard
+        if let data = try? JSONEncoder().encode(devices) {
+            defaults.set(data, forKey: Self.devicesKey)
+        }
+        if let data = try? JSONEncoder().encode(profiles) {
+            defaults.set(data, forKey: Self.profilesKey)
+        }
+        defaults.set(activeProfileID.uuidString, forKey: Self.activeProfileKey)
+    }
+}

CamperMonitor/Store/KeychainStore.swift

@@ -0,0 +1,59 @@
+import Foundation
+import Security
+
+/// Ablage für die Victron-Verschlüsselungsschlüssel. Die gehören nicht in die
+/// UserDefaults, deshalb Keychain.
+enum KeychainStore {
+
+    private static let service = "de.fritob.CamperMonitor.victronKeys"
+
+    static func setKey(_ hex: String?, for deviceID: UUID) {
+        let account = deviceID.uuidString
+        var query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrService as String: service,
+            kSecAttrAccount as String: account,
+        ]
+        SecItemDelete(query as CFDictionary)
+
+        guard let hex, let data = hex.data(using: .utf8) else { return }
+        query[kSecValueData as String] = data
+        query[kSecAttrAccessible as String] = kSecAttrAccessibleAfterFirstUnlock
+        SecItemAdd(query as CFDictionary, nil)
+    }
+
+    static func key(for deviceID: UUID) -> String? {
+        let query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrService as String: service,
+            kSecAttrAccount as String: deviceID.uuidString,
+            kSecReturnData as String: true,
+            kSecMatchLimit as String: kSecMatchLimitOne,
+        ]
+        var result: AnyObject?
+        guard SecItemCopyMatching(query as CFDictionary, &result) == errSecSuccess,
+              let data = result as? Data else { return nil }
+        return String(data: data, encoding: .utf8)
+    }
+}
+
+extension String {
+    /// Wandelt einen Hex-String in Bytes. Leerzeichen, Doppelpunkte und ein
+    /// führendes "0x" werden ignoriert, damit sich der Schlüssel aus
+    /// VictronConnect einfach einfügen lässt.
+    var hexBytes: [UInt8]? {
+        var cleaned = self.lowercased()
+            .replacingOccurrences(of: "0x", with: "")
+            .filter { $0.isHexDigit }
+        guard !cleaned.isEmpty, cleaned.count % 2 == 0 else { return nil }
+        var bytes: [UInt8] = []
+        bytes.reserveCapacity(cleaned.count / 2)
+        while !cleaned.isEmpty {
+            let pair = String(cleaned.prefix(2))
+            cleaned.removeFirst(2)
+            guard let byte = UInt8(pair, radix: 16) else { return nil }
+            bytes.append(byte)
+        }
+        return bytes
+    }
+}

CamperMonitor/Views/AddDeviceView.swift

@@ -0,0 +1,239 @@
+import SwiftUI
+
+/// Einrichten eines neuen Geräts: scannen, auswählen, benennen.
+struct AddDeviceView: View {
+    @Environment(DeviceStore.self) private var store
+    @Environment(BluetoothManager.self) private var bluetooth
+    @Environment(\.dismiss) private var dismiss
+
+    @State private var selected: Discovery?
+    /// Auf einem Stellplatz sind dutzende fremde Geräte in Reichweite.
+    @State private var showsAllDevices = false
+
+    /// Nur Geräte anzeigen, die in den letzten Sekunden zu hören waren –
+    /// sonst füllt sich die Liste in Wohnmobilparks endlos.
+    private var visibleDiscoveries: [Discovery] {
+        // Bewusst nicht nach Signalstärke sortieren: die schwankt im
+        // Sekundentakt und die Liste würde unter dem Finger springen.
+        bluetooth.discoveries.values
+            .filter { showsAllDevices || $0.isVictron || $0.looksLikeDaly }
+            .sorted { lhs, rhs in
+                if lhs.isVictron != rhs.isVictron { return lhs.isVictron }
+                if lhs.looksLikeDaly != rhs.looksLikeDaly { return lhs.looksLikeDaly }
+                return lhs.firstSeen < rhs.firstSeen
+            }
+    }
+
+    private var alreadyAdded: Set<UUID> {
+        Set(store.activeDevices.map(\.peripheralID))
+    }
+
+    var body: some View {
+        NavigationStack {
+            List {
+                Picker("Anzeige", selection: $showsAllDevices) {
+                    Text("Passende Geräte").tag(false)
+                    Text("Alle").tag(true)
+                }
+                .pickerStyle(.segmented)
+                .listRowBackground(Color.clear)
+
+                Section {
+                    if visibleDiscoveries.isEmpty {
+                        Label(showsAllDevices ? "Suche…" : "Noch nichts Passendes gefunden",
+                              systemImage: "antenna.radiowaves.left.and.right")
+                            .foregroundStyle(.secondary)
+                    }
+                    ForEach(visibleDiscoveries) { discovery in
+                        Button {
+                            selected = discovery
+                        } label: {
+                            row(for: discovery)
+                        }
+                        .disabled(alreadyAdded.contains(discovery.id))
+                    }
+                } header: {
+                    HStack {
+                        Text("Gefundene Geräte")
+                        Spacer()
+                        ProgressView().controlSize(.small)
+                    }
+                } footer: {
+                    Text("Victron-Geräte werden automatisch erkannt. Damit sie hier "
+                         + "auftauchen, muss „Instant Readout“ in VictronConnect aktiv sein. "
+                         + "Das BMS meldet sich meist als „DL-…“ – findest du es nicht, "
+                         + "auf „Alle“ umschalten.")
+                }
+            }
+            .navigationTitle("Gerät für \(store.activeProfile?.name ?? "Camper")")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .cancellationAction) {
+                    Button("Fertig") { dismiss() }
+                }
+            }
+            .sheet(item: $selected) { discovery in
+                ConfigureDeviceView(discovery: discovery) {
+                    dismiss()
+                }
+            }
+            .onAppear {
+                bluetooth.clearDiscoveries()
+                bluetooth.isDiscovering = true
+            }
+            .onDisappear {
+                bluetooth.isDiscovering = false
+            }
+        }
+    }
+
+    private func row(for discovery: Discovery) -> some View {
+        HStack(spacing: 12) {
+            Image(systemName: discovery.isVictron ? "bolt.circle.fill"
+                  : discovery.looksLikeDaly ? "battery.100percent" : "dot.radiowaves.left.and.right")
+                .font(.title3)
+                .foregroundStyle(discovery.isVictron || discovery.looksLikeDaly ? Color.accentColor : Color.secondary)
+                .frame(width: 28)
+
+            VStack(alignment: .leading, spacing: 2) {
+                Text(discovery.displayName)
+                    .foregroundStyle(.primary)
+                Text(discovery.subtitle)
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            }
+
+            Spacer()
+
+            if alreadyAdded.contains(discovery.id) {
+                Text("Hinzugefügt")
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            } else {
+                SignalBars(rssi: discovery.rssi)
+            }
+        }
+    }
+}
+
+/// Formular für ein neu gewähltes Gerät.
+private struct ConfigureDeviceView: View {
+    let discovery: Discovery
+    let onSaved: () -> Void
+
+    @Environment(DeviceStore.self) private var store
+    @Environment(BluetoothManager.self) private var bluetooth
+    @Environment(\.dismiss) private var dismiss
+
+    @State private var name: String = ""
+    @State private var role: DeviceRole = .solarCharger
+    @State private var key: String = ""
+
+    private var needsKey: Bool { role.transport == .advertisement }
+    private var keyIsValid: Bool { key.hexBytes?.count == 16 }
+    private var canSave: Bool {
+        !name.trimmingCharacters(in: .whitespaces).isEmpty && (!needsKey || key.isEmpty || keyIsValid)
+    }
+
+    var body: some View {
+        NavigationStack {
+            Form {
+                Section("Gerät") {
+                    LabeledContent("Gefunden als", value: discovery.displayName)
+                    TextField("Name", text: $name)
+                    Picker("Art", selection: $role) {
+                        ForEach(DeviceRole.allCases) { role in
+                            Text(role.title).tag(role)
+                        }
+                    }
+                }
+
+                if needsKey {
+                    Section {
+                        TextField("32 Hex-Zeichen", text: $key)
+                            .font(.system(.body, design: .monospaced))
+                            .textInputAutocapitalization(.never)
+                            .autocorrectionDisabled()
+                        if !key.isEmpty && !keyIsValid {
+                            Label("Der Schlüssel muss 16 Byte (32 Hex-Zeichen) haben.",
+                                  systemImage: "exclamationmark.circle")
+                                .font(.caption)
+                                .foregroundStyle(.orange)
+                        }
+                    } header: {
+                        Text("Verschlüsselungsschlüssel")
+                    } footer: {
+                        Text("VictronConnect → Gerät → Zahnrad → ⋮ → Produkt-Info → "
+                             + "„Instant Readout“ aktivieren → Verschlüsselungsdaten anzeigen. "
+                             + "Kann auch später nachgetragen werden.")
+                    }
+                }
+            }
+            .navigationTitle("Einrichten")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .cancellationAction) {
+                    Button("Abbrechen") { dismiss() }
+                }
+                ToolbarItem(placement: .confirmationAction) {
+                    Button("Sichern", action: save).disabled(!canSave)
+                }
+            }
+            .onAppear(perform: prefill)
+        }
+    }
+
+    /// Aus dem Advertisement lässt sich Art und Name oft schon erraten.
+    private func prefill() {
+        if let recordType = discovery.victronRecordType {
+            switch VictronAdvertisement.RecordType(rawValue: recordType) {
+            case .solarCharger:                 role = .solarCharger
+            case .dcdcConverter, .orionXS:      role = .chargeBooster
+            case .batteryMonitor:               role = .batteryMonitor
+            default:                            role = .solarCharger
+            }
+        } else if discovery.looksLikeDaly {
+            role = .bms
+        }
+        name = discovery.name?.isEmpty == false ? discovery.name! : role.title
+    }
+
+    private func save() {
+        let device = ConfiguredDevice(
+            name: name.trimmingCharacters(in: .whitespaces),
+            role: role,
+            profileID: store.activeProfileID,
+            peripheralID: discovery.id,
+            advertisedName: discovery.name
+        )
+        store.add(device, victronKey: needsKey && keyIsValid ? key : nil)
+        bluetooth.refreshConfiguration()
+        dismiss()
+        onSaved()
+    }
+}
+
+/// Signalstärke als drei Balken.
+struct SignalBars: View {
+    let rssi: Int
+
+    private var level: Int {
+        switch rssi {
+        case (-60)...:      return 3
+        case (-75)..<(-60): return 2
+        case (-90)..<(-75): return 1
+        default:            return 0
+        }
+    }
+
+    var body: some View {
+        HStack(alignment: .bottom, spacing: 2) {
+            ForEach(1...3, id: \.self) { bar in
+                RoundedRectangle(cornerRadius: 1)
+                    .fill(bar <= level ? Color.accentColor : Color.secondary.opacity(0.25))
+                    .frame(width: 3, height: CGFloat(bar) * 4 + 2)
+            }
+        }
+        .accessibilityLabel("Signalstärke \(level) von 3")
+    }
+}

CamperMonitor/Views/DashboardView.swift

@@ -0,0 +1,109 @@
+import SwiftUI
+
+struct DashboardView: View {
+    @Environment(DeviceStore.self) private var store
+    @Environment(BluetoothManager.self) private var bluetooth
+
+    @State private var isAddingDevice = false
+    @State private var isManagingProfiles = false
+
+    private let columns = [GridItem(.adaptive(minimum: 300), spacing: 16)]
+
+    var body: some View {
+        NavigationStack {
+            ScrollView {
+                if !bluetooth.isBluetoothReady {
+                    statusBanner
+                }
+
+                if store.activeDevices.isEmpty {
+                    emptyState
+                } else {
+                    LazyVGrid(columns: columns, spacing: 16) {
+                        ForEach(store.activeDevices) { device in
+                            NavigationLink {
+                                DeviceDetailView(device: device)
+                            } label: {
+                                DeviceCard(
+                                    device: device,
+                                    snapshot: bluetooth.snapshots[device.id],
+                                    linkState: bluetooth.linkStates[device.id] ?? .searching
+                                )
+                            }
+                            .buttonStyle(.plain)
+                        }
+                    }
+                    .padding(.horizontal)
+                    .padding(.top, 8)
+                }
+            }
+            .background(Color(.systemGroupedBackground))
+            .navigationTitle(store.activeProfile?.name ?? "Camper")
+            .toolbar {
+                ToolbarItem(placement: .topBarLeading) {
+                    profileMenu
+                }
+                ToolbarItem(placement: .primaryAction) {
+                    Button("Gerät hinzufügen", systemImage: "plus") {
+                        isAddingDevice = true
+                    }
+                }
+            }
+            .sheet(isPresented: $isAddingDevice) {
+                AddDeviceView()
+            }
+            .sheet(isPresented: $isManagingProfiles) {
+                ProfilesView()
+            }
+        }
+    }
+
+    /// Umschalter zwischen den Fahrzeugen.
+    private var profileMenu: some View {
+        Menu {
+            Picker("Fahrzeug", selection: Binding(
+                get: { store.activeProfileID },
+                set: { id in
+                    guard let profile = store.profiles.first(where: { $0.id == id }) else { return }
+                    store.selectProfile(profile)
+                    bluetooth.refreshConfiguration()
+                }
+            )) {
+                ForEach(store.profiles) { profile in
+                    Label(profile.name, systemImage: profile.symbol).tag(profile.id)
+                }
+            }
+            Divider()
+            Button("Fahrzeuge verwalten…", systemImage: "gearshape") {
+                isManagingProfiles = true
+            }
+        } label: {
+            Label(store.activeProfile?.name ?? "Fahrzeug",
+                  systemImage: store.activeProfile?.symbol ?? "box.truck")
+                .labelStyle(.iconOnly)
+        }
+    }
+
+    private var statusBanner: some View {
+        Label(bluetooth.bluetoothStatusText, systemImage: "exclamationmark.triangle.fill")
+            .font(.callout)
+            .frame(maxWidth: .infinity, alignment: .leading)
+            .padding()
+            .background(.orange.opacity(0.15), in: .rect(cornerRadius: 12))
+            .padding(.horizontal)
+            .padding(.top, 8)
+    }
+
+    private var emptyState: some View {
+        ContentUnavailableView {
+            Label("Noch keine Geräte", systemImage: "antenna.radiowaves.left.and.right")
+        } description: {
+            Text("Füge \(store.activeProfile.map { "„\($0.name)“" } ?? "diesem Fahrzeug") "
+                 + "den Ladebooster, den Solarladeregler und das BMS hinzu.")
+        } actions: {
+            Button("Gerät suchen") { isAddingDevice = true }
+                .buttonStyle(.borderedProminent)
+        }
+        .padding(.top, 60)
+    }
+}

CamperMonitor/Views/DeviceCard.swift

@@ -0,0 +1,137 @@
+import SwiftUI
+
+/// Kachel auf dem Dashboard: Hauptwert gross, darunter die wichtigsten
+/// Nebenwerte und der Verbindungszustand.
+struct DeviceCard: View {
+    let device: ConfiguredDevice
+    let snapshot: DeviceSnapshot?
+    let linkState: DeviceLinkState
+
+    var body: some View {
+        VStack(alignment: .leading, spacing: 12) {
+            header
+
+            if let snapshot, let primary = snapshot.primaryMetric {
+                HStack(alignment: .firstTextBaseline, spacing: 4) {
+                    Text(primary.formatted)
+                        .font(.system(size: 44, weight: .semibold, design: .rounded))
+                        .contentTransition(.numericText())
+                    Text(primary.unit)
+                        .font(.title3.weight(.medium))
+                        .foregroundStyle(.secondary)
+                }
+                .foregroundStyle(snapshot.isStale ? .secondary : .primary)
+
+                secondaryValues(for: snapshot)
+            } else {
+                Text(placeholderText)
+                    .font(.callout)
+                    .foregroundStyle(.secondary)
+                    .frame(maxWidth: .infinity, alignment: .leading)
+                    .padding(.vertical, 18)
+            }
+
+            footer
+        }
+        .padding(16)
+        .frame(maxWidth: .infinity, alignment: .leading)
+        .background(Color(.secondarySystemGroupedBackground), in: .rect(cornerRadius: 16))
+    }
+
+    private var header: some View {
+        HStack(spacing: 8) {
+            Image(systemName: device.role.symbol)
+                .foregroundStyle(.tint)
+            VStack(alignment: .leading, spacing: 1) {
+                Text(device.name)
+                    .font(.headline)
+                Text(device.role.title)
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            }
+            Spacer()
+            StatusDot(linkState: linkState, isStale: snapshot?.isStale ?? true)
+        }
+    }
+
+    private func secondaryValues(for snapshot: DeviceSnapshot) -> some View {
+        let others = snapshot.metrics
+            .filter { $0.id != snapshot.primaryMetric?.id && $0.value != nil }
+            .prefix(3)
+        return HStack(spacing: 16) {
+            ForEach(Array(others)) { metric in
+                VStack(alignment: .leading, spacing: 1) {
+                    Text(metric.formattedWithUnit)
+                        .font(.subheadline.weight(.medium))
+                        .monospacedDigit()
+                    Text(metric.label)
+                        .font(.caption2)
+                        .foregroundStyle(.secondary)
+                        .lineLimit(1)
+                }
+            }
+            Spacer(minLength: 0)
+        }
+    }
+
+    @ViewBuilder
+    private var footer: some View {
+        if let fault = snapshot?.fault {
+            Label(fault, systemImage: "exclamationmark.triangle.fill")
+                .font(.caption)
+                .foregroundStyle(.red)
+                .lineLimit(2)
+        } else if let state = snapshot?.state {
+            // Bei "Aus" ist erst der Grund die eigentliche Information.
+            let reason = snapshot?.offReasons.first
+            Text(reason.map { "\(state) · \($0)" } ?? state)
+                .font(.caption)
+                .foregroundStyle(.secondary)
+                .lineLimit(2)
+        } else if case .failed(let message) = linkState {
+            Text(message)
+                .font(.caption)
+                .foregroundStyle(.orange)
+                .lineLimit(2)
+        }
+    }
+
+    private var placeholderText: String {
+        switch linkState {
+        case .needsKey: return "Verschlüsselungsschlüssel fehlt – im Detail eintragen."
+        case .failed(let message): return message
+        default: return "Warte auf Daten…"
+        }
+    }
+}
+
+/// Kleiner Punkt, der Verbindungszustand und Aktualität zusammenfasst.
+struct StatusDot: View {
+    let linkState: DeviceLinkState
+    let isStale: Bool
+
+    var body: some View {
+        HStack(spacing: 5) {
+            Circle()
+                .fill(color)
+                .frame(width: 8, height: 8)
+            Text(label)
+                .font(.caption2)
+                .foregroundStyle(.secondary)
+        }
+    }
+
+    private var color: Color {
+        switch linkState {
+        case .live:      return isStale ? .orange : .green
+        case .needsKey:  return .orange
+        case .failed:    return .red
+        default:         return .secondary
+        }
+    }
+
+    private var label: String {
+        if case .live = linkState, isStale { return "Veraltet" }
+        return linkState.label
+    }
+}

CamperMonitor/Views/DeviceDetailView.swift

@@ -0,0 +1,298 @@
+import Charts
+import SwiftUI
+
+struct DeviceDetailView: View {
+    let device: ConfiguredDevice
+
+    @Environment(DeviceStore.self) private var store
+    @Environment(BluetoothManager.self) private var bluetooth
+    @Environment(\.dismiss) private var dismiss
+
+    @State private var editedName = ""
+    @State private var keyInput = ""
+    @State private var showDeleteConfirmation = false
+
+    private var snapshot: DeviceSnapshot? { bluetooth.snapshots[device.id] }
+    private var linkState: DeviceLinkState { bluetooth.linkStates[device.id] ?? .searching }
+    private var samples: [HistorySample] { bluetooth.history[device.id] ?? [] }
+
+    var body: some View {
+        List {
+            statusSection
+
+            if let snapshot, !snapshot.metrics.isEmpty {
+                Section("Messwerte") {
+                    ForEach(snapshot.metrics) { metric in
+                        LabeledContent(metric.label) {
+                            Text(metric.formattedWithUnit)
+                                .monospacedDigit()
+                                .foregroundStyle(metric.value == nil ? .secondary : .primary)
+                        }
+                    }
+                }
+            }
+
+            if samples.count > 1, let primary = snapshot?.primaryMetric {
+                Section("Verlauf – \(primary.label)") {
+                    Chart(samples) { sample in
+                        AreaMark(x: .value("Zeit", sample.time),
+                                 y: .value(primary.label, sample.value))
+                        .foregroundStyle(.tint.opacity(0.15))
+                        LineMark(x: .value("Zeit", sample.time),
+                                 y: .value(primary.label, sample.value))
+                        .foregroundStyle(.tint)
+                        .interpolationMethod(.monotone)
+                    }
+                    .chartYAxisLabel(primary.unit)
+                    .frame(height: 180)
+                    .padding(.vertical, 8)
+                }
+            }
+
+            if let snapshot, !snapshot.cellVoltages.isEmpty {
+                cellSection(snapshot.cellVoltages)
+            }
+
+            if let snapshot, snapshot.temperatures.count > 1 {
+                Section("Temperaturen") {
+                    ForEach(Array(snapshot.temperatures.enumerated()), id: \.offset) { index, value in
+                        LabeledContent("Fühler \(index + 1)") {
+                            Text(String(format: "%.0f °C", value)).monospacedDigit()
+                        }
+                    }
+                }
+            }
+
+            if device.role.transport == .advertisement {
+                keySection
+                diagnosticsSection
+            } else {
+                bmsDiagnosticsSection
+            }
+
+            settingsSection
+        }
+        .navigationTitle(device.name)
+        .navigationBarTitleDisplayMode(.inline)
+        .onAppear {
+            editedName = device.name
+            keyInput = store.victronKeyText(for: device.id) ?? ""
+        }
+        .confirmationDialog("Gerät entfernen?",
+                            isPresented: $showDeleteConfirmation,
+                            titleVisibility: .visible) {
+            Button("Entfernen", role: .destructive) {
+                store.remove(device)
+                bluetooth.refreshConfiguration()
+                dismiss()
+            }
+        } message: {
+            Text("Die Einstellungen und der hinterlegte Schlüssel werden gelöscht.")
+        }
+    }
+
+    // MARK: - Abschnitte
+
+    private var statusSection: some View {
+        Section {
+            LabeledContent("Verbindung") {
+                StatusDot(linkState: linkState, isStale: snapshot?.isStale ?? true)
+            }
+            if let state = snapshot?.state {
+                LabeledContent("Zustand", value: state)
+            }
+            if let fault = snapshot?.fault {
+                Label(fault, systemImage: "exclamationmark.triangle.fill")
+                    .foregroundStyle(.red)
+            }
+            ForEach(snapshot?.offReasons ?? [], id: \.self) { reason in
+                Label(reason, systemImage: "pause.circle")
+                    .foregroundStyle(.orange)
+            }
+            if let snapshot {
+                LabeledContent("Aktualisiert vor") {
+                    Text(snapshot.timestamp, style: .relative)
+                }
+                .foregroundStyle(.secondary)
+            }
+            if let rssi = snapshot?.rssi {
+                LabeledContent("Signal", value: "\(rssi) dBm")
+                    .foregroundStyle(.secondary)
+            }
+        }
+    }
+
+    private func cellSection(_ voltages: [Double]) -> some View {
+        let minimum = voltages.min() ?? 0
+        let maximum = voltages.max() ?? 0
+        return Section("Zellspannungen") {
+            Chart(Array(voltages.enumerated()), id: \.offset) { index, voltage in
+                // Kategoriale x-Achse: sonst stehen die Balken zwischen den
+                // Beschriftungen statt darüber.
+                BarMark(
+                    x: .value("Zelle", "\(index + 1)"),
+                    y: .value("Spannung", voltage)
+                )
+                .foregroundStyle(voltage == maximum ? Color.orange
+                                 : voltage == minimum ? Color.blue : Color.accentColor)
+                // Die Zellnummer als Beschriftung am Balken statt über die
+                // x-Achse – die blendet Swift Charts in der Liste aus.
+                // Ab neun Zellen wird es zu eng, dann ordnet die Liste zu.
+                .annotation(position: .bottom, alignment: .center) {
+                    if voltages.count <= 8 {
+                        Text("\(index + 1)")
+                            .font(.caption2)
+                            .foregroundStyle(.secondary)
+                    }
+                }
+            }
+            .chartXAxis(.hidden)
+            // Der interessante Bereich sind die letzten Millivolt, nicht die
+            // absolute Spannung – deshalb eng um die Messwerte zoomen.
+            .chartYScale(domain: (minimum - 0.05)...(maximum + 0.05))
+            .chartYAxisLabel("V")
+            .frame(height: 160)
+            .padding(.vertical, 8)
+
+            ForEach(Array(voltages.enumerated()), id: \.offset) { index, voltage in
+                LabeledContent("Zelle \(index + 1)") {
+                    Text(String(format: "%.3f V", voltage)).monospacedDigit()
+                }
+            }
+        }
+    }
+
+    private var keySection: some View {
+        Section {
+            TextField("32 Hex-Zeichen", text: $keyInput)
+                .font(.system(.body, design: .monospaced))
+                .textInputAutocapitalization(.never)
+                .autocorrectionDisabled()
+                .onSubmit(saveKey)
+            Button("Schlüssel speichern", action: saveKey)
+                .disabled(keyInput.hexBytes?.count != 16)
+        } header: {
+            Text("Verschlüsselungsschlüssel")
+        } footer: {
+            Text("In VictronConnect: Gerät öffnen → Zahnrad → ⋮ → Produkt-Info → "
+                 + "„Instant Readout“ einschalten → Verschlüsselungsdaten anzeigen. "
+                 + "Der Schlüssel ist 16 Byte lang (32 Hex-Zeichen).")
+        }
+    }
+
+    /// Zeigt, was das Gerät unverschlüsselt sendet. Wichtigster Wert ist das
+    /// erste Schlüsselbyte: stimmt es nicht mit der Eingabe überein, gehört der
+    /// Schlüssel zu einem anderen Victron-Gerät.
+    @ViewBuilder
+    private var diagnosticsSection: some View {
+        if let info = bluetooth.diagnostics[device.id] {
+            Section {
+                LabeledContent("Gerät sendet als erstes Schlüsselbyte") {
+                    Text(info.expectedKeyText)
+                        .font(.body.monospaced())
+                        .foregroundStyle(keyBytesAgree == false ? .red : .primary)
+                }
+                LabeledContent("Eingetragener Schlüssel beginnt mit") {
+                    Text(enteredKeyText)
+                        .font(.body.monospaced())
+                        .foregroundStyle(keyBytesAgree == false ? .red : .secondary)
+                }
+                LabeledContent("Datensatz", value: info.recordName)
+                LabeledContent("Produkt-ID") {
+                    Text(info.productIDText).font(.body.monospaced())
+                }
+                VStack(alignment: .leading, spacing: 4) {
+                    Text("Rohdaten")
+                    Text(info.rawHex)
+                        .font(.caption.monospaced())
+                        .foregroundStyle(.secondary)
+                        .textSelection(.enabled)
+                }
+            } header: {
+                Text("Diagnose")
+            } footer: {
+                if keyBytesAgree == false {
+                    Text("Die beiden Bytes müssen übereinstimmen. Tun sie das nicht, "
+                         + "stammt der Schlüssel von einem anderen Victron-Gerät – in "
+                         + "VictronConnect prüfen, ob wirklich dieses Gerät geöffnet war.")
+                } else {
+                    Text("Diese Werte sendet das Gerät unverschlüsselt mit.")
+                }
+            }
+        }
+    }
+
+    /// nil, solange kein vollständiger Schlüssel eingetragen ist.
+    private var keyBytesAgree: Bool? {
+        guard let expected = bluetooth.diagnostics[device.id]?.expectedKeyFirstByte,
+              let entered = keyInput.hexBytes?.first else { return nil }
+        return expected == entered
+    }
+
+    private var enteredKeyText: String {
+        guard let byte = keyInput.hexBytes?.first else { return "–" }
+        return String(format: "0x%02X", byte)
+    }
+
+    /// Welches Protokoll das BMS spricht und was zuletzt ankam.
+    @ViewBuilder
+    private var bmsDiagnosticsSection: some View {
+        if let info = bluetooth.bmsDiagnostics[device.id] {
+            Section {
+                LabeledContent("Erkanntes Protokoll", value: info.dialect)
+                if let service = info.serviceUUID {
+                    LabeledContent("Dienst") {
+                        Text(service).font(.caption.monospaced()).foregroundStyle(.secondary)
+                    }
+                }
+                if let hex = info.lastResponseHex {
+                    VStack(alignment: .leading, spacing: 4) {
+                        Text("Letzte Antwort")
+                        Text(hex)
+                            .font(.caption.monospaced())
+                            .foregroundStyle(.secondary)
+                            .textSelection(.enabled)
+                    }
+                }
+            } header: {
+                Text("Diagnose")
+            } footer: {
+                Text("Die App probiert Daly (klassisch und Modbus) sowie JBD/Xiaoxiang "
+                     + "durch und übernimmt, was antwortet. Bleibt es bei „wird ermittelt“, "
+                     + "spricht das BMS ein anderes Protokoll – dann hilft die Rohantwort weiter.")
+            }
+        }
+    }
+
+    private var settingsSection: some View {
+        Section("Einstellungen") {
+            TextField("Name", text: $editedName)
+                .onSubmit(saveName)
+            Button("Namen übernehmen", action: saveName)
+                .disabled(editedName.trimmingCharacters(in: .whitespaces).isEmpty
+                          || editedName == device.name)
+            LabeledContent("Typ", value: device.role.title)
+            LabeledContent("Bluetooth-ID") {
+                Text(device.peripheralID.uuidString.prefix(8) + "…")
+                    .font(.caption.monospaced())
+                    .foregroundStyle(.secondary)
+            }
+            Button("Gerät entfernen", role: .destructive) {
+                showDeleteConfirmation = true
+            }
+        }
+    }
+
+    // MARK: - Aktionen
+
+    private func saveKey() {
+        store.setVictronKey(keyInput, for: device.id)
+        bluetooth.refreshConfiguration()
+    }
+
+    private func saveName() {
+        var updated = device
+        updated.name = editedName.trimmingCharacters(in: .whitespaces)
+        store.update(updated)
+    }
+}

CamperMonitor/Views/ProfilesView.swift

@@ -0,0 +1,168 @@
+import SwiftUI
+
+/// Fahrzeuge anlegen, umbenennen und entfernen.
+struct ProfilesView: View {
+    @Environment(DeviceStore.self) private var store
+    @Environment(BluetoothManager.self) private var bluetooth
+    @Environment(\.dismiss) private var dismiss
+
+    @State private var editing: Profile?
+    @State private var pendingDeletion: Profile?
+
+    var body: some View {
+        NavigationStack {
+            List {
+                Section {
+                    ForEach(store.profiles) { profile in
+                        row(for: profile)
+                    }
+                } footer: {
+                    Text("Jedes Fahrzeug hat seine eigenen Geräte. Die App liest immer "
+                         + "nur die des gewählten Fahrzeugs aus.")
+                }
+
+                Section {
+                    Button("Fahrzeug hinzufügen", systemImage: "plus") {
+                        let profile = store.addProfile(named: "Camper \(store.profiles.count + 1)")
+                        editing = profile
+                    }
+                }
+            }
+            .navigationTitle("Fahrzeuge")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .confirmationAction) {
+                    Button("Fertig") { dismiss() }
+                }
+            }
+            .sheet(item: $editing) { profile in
+                ProfileEditView(profile: profile)
+            }
+            .confirmationDialog("Fahrzeug entfernen?",
+                                isPresented: .init(get: { pendingDeletion != nil },
+                                                   set: { if !$0 { pendingDeletion = nil } }),
+                                titleVisibility: .visible) {
+                Button("Entfernen", role: .destructive) {
+                    if let pendingDeletion {
+                        store.removeProfile(pendingDeletion)
+                        bluetooth.refreshConfiguration()
+                    }
+                    pendingDeletion = nil
+                }
+            } message: {
+                if let pendingDeletion {
+                    Text("„\(pendingDeletion.name)“ und die \(store.deviceCount(in: pendingDeletion)) "
+                         + "darin eingerichteten Geräte werden gelöscht.")
+                }
+            }
+        }
+    }
+
+    private func row(for profile: Profile) -> some View {
+        HStack {
+            Label {
+                VStack(alignment: .leading, spacing: 2) {
+                    Text(profile.name)
+                    Text(deviceSummary(for: profile))
+                        .font(.caption)
+                        .foregroundStyle(.secondary)
+                }
+            } icon: {
+                Image(systemName: profile.symbol)
+            }
+
+            Spacer()
+
+            if profile.id == store.activeProfileID {
+                Image(systemName: "checkmark")
+                    .foregroundStyle(.tint)
+                    .fontWeight(.semibold)
+            }
+        }
+        .contentShape(.rect)
+        .onTapGesture {
+            store.selectProfile(profile)
+            bluetooth.refreshConfiguration()
+        }
+        .swipeActions(edge: .trailing) {
+            // Das letzte Fahrzeug muss bleiben, sonst hätten Geräte keinen Ort.
+            if store.hasMultipleProfiles {
+                Button("Entfernen", systemImage: "trash", role: .destructive) {
+                    pendingDeletion = profile
+                }
+            }
+            Button("Bearbeiten", systemImage: "pencil") {
+                editing = profile
+            }
+            .tint(.gray)
+        }
+    }
+
+    private func deviceSummary(for profile: Profile) -> String {
+        let count = store.deviceCount(in: profile)
+        return count == 1 ? "1 Gerät" : "\(count) Geräte"
+    }
+}
+
+/// Name und Symbol eines Fahrzeugs ändern.
+private struct ProfileEditView: View {
+    let profile: Profile
+
+    @Environment(DeviceStore.self) private var store
+    @Environment(\.dismiss) private var dismiss
+
+    @State private var name = ""
+    @State private var symbol = "box.truck"
+
+    private let columns = [GridItem(.adaptive(minimum: 60), spacing: 12)]
+
+    var body: some View {
+        NavigationStack {
+            Form {
+                Section("Name") {
+                    TextField("Name", text: $name)
+                }
+                Section("Symbol") {
+                    LazyVGrid(columns: columns, spacing: 12) {
+                        ForEach(Profile.symbols, id: \.self) { candidate in
+                            Button {
+                                symbol = candidate
+                            } label: {
+                                Image(systemName: candidate)
+                                    .font(.title2)
+                                    .frame(width: 52, height: 52)
+                                    .background(symbol == candidate ? Color.accentColor.opacity(0.18)
+                                                                    : Color.secondary.opacity(0.08),
+                                                in: .rect(cornerRadius: 12))
+                                    .foregroundStyle(symbol == candidate ? Color.accentColor : Color.primary)
+                            }
+                            .buttonStyle(.plain)
+                        }
+                    }
+                    .padding(.vertical, 4)
+                }
+            }
+            .navigationTitle("Fahrzeug")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .cancellationAction) {
+                    Button("Abbrechen") { dismiss() }
+                }
+                ToolbarItem(placement: .confirmationAction) {
+                    Button("Sichern") {
+                        var updated = profile
+                        updated.name = name.trimmingCharacters(in: .whitespaces)
+                        updated.symbol = symbol
+                        store.update(updated)
+                        dismiss()
+                    }
+                    .disabled(name.trimmingCharacters(in: .whitespaces).isEmpty)
+                }
+            }
+            .onAppear {
+                name = profile.name
+                symbol = profile.symbol
+            }
+        }
+    }
+}