Schwifty
3c41ecb49d
Two changes: 1. DXSmartProvisioner now registers for BLE disconnect callbacks. Previously if the beacon dropped the link mid-write, the provisioner would sit waiting for ACK timeouts (5s × 2 retries = 10s of dead air). Now it fails immediately with a clear error. 2. Inter-command delay reduced from 150ms → 50ms since beacon handles fast writes fine. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
537 lines
24 KiB
Swift
537 lines
24 KiB
Swift
import Foundation
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import CoreBluetooth
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/// Provisioner for DXSmart / CP28 hardware
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///
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/// Implements BOTH the new SDK protocol (preferred) and old SDK fallback:
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///
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/// **New SDK (2024.10+)**: Writes to FFE2, notifications on FFE1
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/// - Frame selection (0x11/0x12) → frame type (0x62 = iBeacon)
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/// - Param writes: 0x74 UUID, 0x75 Major, 0x76 Minor, 0x77 RSSI, 0x78 AdvInt, 0x79 TxPower
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/// - Save: 0x60
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/// - All wrapped in 4E 4F protocol packets
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///
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/// **Old SDK fallback**: Writes to FFE1, re-sends 555555 before each command
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/// - 0x36 UUID, 0x37 Major, 0x38 Minor, 0x39 TxPower, 0x40 RfPower, 0x41 AdvInt, 0x43 Name
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/// - 0x44 Restart (includes password)
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///
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/// Auth: "555555" to FFE3 (config mode) → "dx1234" to FFE3 (authenticate)
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/// NOTE: CoreBluetooth doesn't expose raw MAC addresses, so 48:87:2D OUI detection
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/// (used on Android) is not available on iOS. Beacons are detected by name/service UUID.
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final class DXSmartProvisioner: NSObject, BeaconProvisioner {
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// MARK: - Constants
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private static let triggerPassword = "555555"
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private static let defaultPassword = "dx1234"
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// MARK: - State
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private let peripheral: CBPeripheral
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private let centralManager: CBCentralManager
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private var ffe1Char: CBCharacteristic? // FFE1 — notify (ACK responses)
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private var ffe2Char: CBCharacteristic? // FFE2 — write (new SDK commands)
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private var ffe3Char: CBCharacteristic? // FFE3 — password
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private var connectionContinuation: CheckedContinuation<Void, Error>?
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private var serviceContinuation: CheckedContinuation<Void, Error>?
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private var responseContinuation: CheckedContinuation<Data, Error>?
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private var writeContinuation: CheckedContinuation<Void, Error>?
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private(set) var isConnected = false
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private(set) var isFlashing = false // Beacon LED flashing after trigger
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private var useNewSDK = true // Prefer new SDK, fallback to old
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private var disconnected = false // Set true when BLE link drops unexpectedly
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var diagnosticLog: ProvisionLog?
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var bleManager: BLEManager?
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// MARK: - Init
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init(peripheral: CBPeripheral, centralManager: CBCentralManager) {
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self.peripheral = peripheral
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self.centralManager = centralManager
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super.init()
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self.peripheral.delegate = self
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}
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// MARK: - BeaconProvisioner
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/// Status callback — provisioner reports what phase it's in so UI can update
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var onStatusUpdate: ((String) -> Void)?
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func connect() async throws {
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for attempt in 1...GATTConstants.maxRetries {
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await diagnosticLog?.log("connect", "Attempt \(attempt)/\(GATTConstants.maxRetries) — peripheral: \(peripheral.name ?? "unnamed"), state: \(peripheral.state.rawValue)")
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do {
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let attemptLabel = GATTConstants.maxRetries > 1 ? " (attempt \(attempt)/\(GATTConstants.maxRetries))" : ""
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await MainActor.run { onStatusUpdate?("Connecting to beacon…\(attemptLabel)") }
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await diagnosticLog?.log("connect", "Connecting (timeout: \(GATTConstants.connectionTimeout)s)…")
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try await connectOnce()
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await MainActor.run { onStatusUpdate?("Discovering services…") }
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await diagnosticLog?.log("connect", "Connected — discovering services…")
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try await discoverServices()
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await diagnosticLog?.log("connect", "Services found — FFE1:\(ffe1Char != nil) FFE2:\(ffe2Char != nil) FFE3:\(ffe3Char != nil)")
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await MainActor.run { onStatusUpdate?("Authenticating…") }
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await diagnosticLog?.log("auth", "Authenticating (trigger + password)…")
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try await authenticate()
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await diagnosticLog?.log("auth", "Auth complete — SDK: \(useNewSDK ? "new (FFE2)" : "old (FFE1)")")
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// Register for unexpected disconnects so we fail fast instead of
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// waiting for per-command ACK timeouts (5s × 2 = 10s of dead air).
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bleManager?.onPeripheralDisconnected = { [weak self] disconnectedPeripheral, error in
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guard disconnectedPeripheral.identifier == self?.peripheral.identifier else { return }
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self?.handleUnexpectedDisconnect(error: error)
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}
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isConnected = true
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isFlashing = true
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return
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} catch {
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await diagnosticLog?.log("connect", "Attempt \(attempt) failed: \(error.localizedDescription)", isError: true)
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disconnect()
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if attempt < GATTConstants.maxRetries {
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await MainActor.run { onStatusUpdate?("Retrying… (\(attempt)/\(GATTConstants.maxRetries))") }
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await diagnosticLog?.log("connect", "Retrying in \(GATTConstants.retryDelay)s…")
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try await Task.sleep(nanoseconds: UInt64(GATTConstants.retryDelay * 1_000_000_000))
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} else {
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await diagnosticLog?.log("connect", "All \(GATTConstants.maxRetries) attempts exhausted", isError: true)
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throw error
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}
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}
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}
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}
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func writeConfig(_ config: BeaconConfig) async throws {
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guard isConnected else {
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await diagnosticLog?.log("write", "Not connected — aborting write", isError: true)
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throw ProvisionError.notConnected
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}
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let uuidBytes = config.uuid.hexToBytes
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guard uuidBytes.count == 16 else {
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await diagnosticLog?.log("write", "Invalid UUID length: \(uuidBytes.count) bytes", isError: true)
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throw ProvisionError.writeFailed("Invalid UUID length")
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}
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await diagnosticLog?.log("write", "Config: UUID=\(config.uuid.prefix(8))… Major=\(config.major) Minor=\(config.minor) TxPower=\(config.txPower) AdvInt=\(config.advInterval)")
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// Try new SDK first (FFE2), fall back to old SDK (FFE1)
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if useNewSDK, let ffe2 = ffe2Char {
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await diagnosticLog?.log("write", "Using new SDK (FFE2) — 22 commands to write")
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try await writeConfigNewSDK(config, uuidBytes: uuidBytes, writeChar: ffe2)
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} else if let ffe1 = ffe1Char {
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await diagnosticLog?.log("write", "Using old SDK (FFE1) — 7 commands to write")
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try await writeConfigOldSDK(config, uuidBytes: uuidBytes, writeChar: ffe1)
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} else {
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await diagnosticLog?.log("write", "No write characteristic available", isError: true)
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throw ProvisionError.characteristicNotFound
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}
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await diagnosticLog?.log("write", "All commands written successfully")
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isFlashing = false
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}
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func disconnect() {
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// Unregister disconnect handler so intentional disconnect doesn't trigger error path
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bleManager?.onPeripheralDisconnected = nil
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if peripheral.state == .connected || peripheral.state == .connecting {
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centralManager.cancelPeripheralConnection(peripheral)
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}
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isConnected = false
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isFlashing = false
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}
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// MARK: - New SDK Protocol (FFE2, 2024.10+)
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// Matches Android DXSmartProvisioner.writeBeaconConfig()
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private func writeConfigNewSDK(_ config: BeaconConfig, uuidBytes: [UInt8], writeChar: CBCharacteristic) async throws {
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// Build command sequence matching Android's writeBeaconConfig()
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let commands: [(String, Data)] = [
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// Frame 1: device info + radio params
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("Frame1_Select", buildProtocolPacket(cmd: 0x11, data: Data())),
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("Frame1_DevInfo", buildProtocolPacket(cmd: 0x61, data: Data())),
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("Frame1_RSSI", buildProtocolPacket(cmd: 0x77, data: Data([UInt8(bitPattern: config.measuredPower)]))),
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("Frame1_AdvInt", buildProtocolPacket(cmd: 0x78, data: Data([UInt8(config.advInterval & 0xFF)]))),
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("Frame1_TxPow", buildProtocolPacket(cmd: 0x79, data: Data([config.txPower]))),
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// Frame 2: iBeacon config
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("Frame2_Select", buildProtocolPacket(cmd: 0x12, data: Data())),
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("Frame2_iBeacon", buildProtocolPacket(cmd: 0x62, data: Data())),
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("UUID", buildProtocolPacket(cmd: 0x74, data: Data(uuidBytes))),
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("Major", buildProtocolPacket(cmd: 0x75, data: Data([UInt8(config.major >> 8), UInt8(config.major & 0xFF)]))),
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("Minor", buildProtocolPacket(cmd: 0x76, data: Data([UInt8(config.minor >> 8), UInt8(config.minor & 0xFF)]))),
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("RSSI@1m", buildProtocolPacket(cmd: 0x77, data: Data([UInt8(bitPattern: config.measuredPower)]))),
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("AdvInterval", buildProtocolPacket(cmd: 0x78, data: Data([UInt8(config.advInterval & 0xFF)]))),
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("TxPower", buildProtocolPacket(cmd: 0x79, data: Data([config.txPower]))),
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("TriggerOff", buildProtocolPacket(cmd: 0xA0, data: Data())),
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// Disable frames 3-6
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("Frame3_Select", buildProtocolPacket(cmd: 0x13, data: Data())),
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("Frame3_NoData", buildProtocolPacket(cmd: 0xFF, data: Data())),
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("Frame4_Select", buildProtocolPacket(cmd: 0x14, data: Data())),
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("Frame4_NoData", buildProtocolPacket(cmd: 0xFF, data: Data())),
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("Frame5_Select", buildProtocolPacket(cmd: 0x15, data: Data())),
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("Frame5_NoData", buildProtocolPacket(cmd: 0xFF, data: Data())),
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("Frame6_Select", buildProtocolPacket(cmd: 0x16, data: Data())),
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("Frame6_NoData", buildProtocolPacket(cmd: 0xFF, data: Data())),
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// Save to flash
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("SaveConfig", buildProtocolPacket(cmd: 0x60, data: Data())),
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]
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for (index, (name, packet)) in commands.enumerated() {
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// Bail immediately if BLE link dropped between commands
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if disconnected {
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await diagnosticLog?.log("write", "Aborting — BLE disconnected", isError: true)
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throw ProvisionError.writeFailed("BLE disconnected during write sequence")
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}
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await diagnosticLog?.log("write", "[\(index + 1)/\(commands.count)] \(name) (\(packet.count) bytes)")
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// SaveConfig (last command) causes beacon MCU to reboot — it never sends an ACK.
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// Use .withoutResponse so CoreBluetooth fires the bytes immediately into the
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// BLE radio buffer without waiting for a GATT round-trip. With .withResponse,
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// the beacon reboots before the ACK arrives, and CoreBluetooth may silently
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// drop the write — leaving the config unsaved and the beacon still flashing.
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if name == "SaveConfig" {
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peripheral.writeValue(packet, for: writeChar, type: .withoutResponse)
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await diagnosticLog?.log("write", "✅ [\(index + 1)/\(commands.count)] SaveConfig sent — beacon will reboot")
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await diagnosticLog?.log("write", "✅ All commands written successfully")
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return
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}
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// Retry each command up to 2 times — beacon BLE stack can be flaky
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var lastError: Error?
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for writeAttempt in 1...2 {
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do {
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try await writeToCharAndWaitACK(writeChar, data: packet, label: name)
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lastError = nil
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break
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} catch {
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lastError = error
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if writeAttempt == 1 {
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await diagnosticLog?.log("write", "[\(index + 1)/\(commands.count)] \(name) retry after: \(error.localizedDescription)")
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try await Task.sleep(nanoseconds: 500_000_000) // 500ms before retry
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}
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}
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}
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if let lastError {
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await diagnosticLog?.log("write", "[\(index + 1)/\(commands.count)] \(name) FAILED: \(lastError.localizedDescription)", isError: true)
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throw lastError
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}
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// 50ms between commands — beacon handles fast writes fine (was 150ms, 300ms, 500ms)
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try await Task.sleep(nanoseconds: 50_000_000)
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}
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}
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// MARK: - Old SDK Protocol (FFE1, pre-2024.10)
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// Matches Android DXSmartProvisioner.writeFrame1()
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// Key difference: must re-send "555555" to FFE3 before EVERY command
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private func writeConfigOldSDK(_ config: BeaconConfig, uuidBytes: [UInt8], writeChar: CBCharacteristic) async throws {
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guard let ffe3 = ffe3Char else {
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throw ProvisionError.characteristicNotFound
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}
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let commands: [(String, Data)] = [
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("UUID", buildProtocolPacket(cmd: 0x36, data: Data(uuidBytes))),
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("Major", buildProtocolPacket(cmd: 0x37, data: Data([UInt8(config.major >> 8), UInt8(config.major & 0xFF)]))),
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("Minor", buildProtocolPacket(cmd: 0x38, data: Data([UInt8(config.minor >> 8), UInt8(config.minor & 0xFF)]))),
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("TxPower", buildProtocolPacket(cmd: 0x39, data: Data([UInt8(bitPattern: config.measuredPower)]))),
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("RfPower", buildProtocolPacket(cmd: 0x40, data: Data([config.txPower]))),
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("AdvInt", buildProtocolPacket(cmd: 0x41, data: Data([UInt8(config.advInterval & 0xFF)]))),
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("Name", buildProtocolPacket(cmd: 0x43, data: Data("Payfrit".utf8))),
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]
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for (name, packet) in commands {
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// Step 1: Re-send "555555" to FFE3 before each command (old SDK requirement)
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if let triggerData = Self.triggerPassword.data(using: .utf8) {
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peripheral.writeValue(triggerData, for: ffe3, type: .withResponse)
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try await waitForWriteCallback()
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}
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// Step 2: 50ms delay (SDK timer, half of 100ms default — tested OK)
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try await Task.sleep(nanoseconds: 50_000_000)
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// Step 3: Write command to FFE1
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try await writeToCharAndWaitACK(writeChar, data: packet, label: name)
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// 200ms settle between params
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try await Task.sleep(nanoseconds: 200_000_000)
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}
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}
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// MARK: - Read-Back Verification
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/// Read frame 2 (iBeacon config) to verify the write succeeded.
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/// Returns the raw response data, or nil if read fails.
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func readFrame2() async throws -> Data? {
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guard let ffe2 = ffe2Char ?? ffe1Char else { return nil }
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let readCmd = buildProtocolPacket(cmd: 0x62, data: Data())
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peripheral.writeValue(readCmd, for: ffe2, type: .withResponse)
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do {
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let response = try await waitForResponse(timeout: 2.0)
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return response
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} catch {
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return nil
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}
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}
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// MARK: - Protocol Packet Builder
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// Format: 4E 4F [CMD] [LEN] [DATA...] [CHECKSUM]
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// Checksum = XOR of CMD, LEN, and all data bytes
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private func buildProtocolPacket(cmd: UInt8, data: Data) -> Data {
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let len = UInt8(data.count)
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var checksum = Int(cmd) ^ Int(len)
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for byte in data {
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checksum ^= Int(byte)
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}
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var packet = Data([0x4E, 0x4F, cmd, len])
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packet.append(data)
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packet.append(UInt8(checksum & 0xFF))
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return packet
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}
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// MARK: - Disconnect Detection
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/// Called when BLE link drops unexpectedly during provisioning.
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/// Immediately resolves any pending continuations so we fail fast
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/// instead of waiting for the 5s operationTimeout.
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private func handleUnexpectedDisconnect(error: Error?) {
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disconnected = true
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isConnected = false
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let disconnectError = ProvisionError.writeFailed("BLE disconnected unexpectedly: \(error?.localizedDescription ?? "unknown")")
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Task { await diagnosticLog?.log("ble", "⚠️ Unexpected disconnect during provisioning", isError: true) }
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// Cancel any pending write/response continuation immediately
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if let cont = responseContinuation {
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responseContinuation = nil
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cont.resume(throwing: disconnectError)
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}
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if let cont = writeContinuation {
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writeContinuation = nil
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cont.resume(throwing: disconnectError)
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}
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if let cont = connectionContinuation {
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connectionContinuation = nil
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cont.resume(throwing: disconnectError)
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}
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}
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// MARK: - Private Helpers
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private func connectOnce() async throws {
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try await withCheckedThrowingContinuation { (cont: CheckedContinuation<Void, Error>) in
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connectionContinuation = cont
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// Register for connection callbacks via BLEManager (the CBCentralManagerDelegate)
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bleManager?.onPeripheralConnected = { [weak self] connectedPeripheral in
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guard connectedPeripheral.identifier == self?.peripheral.identifier else { return }
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if let c = self?.connectionContinuation {
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self?.connectionContinuation = nil
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c.resume()
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}
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}
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bleManager?.onPeripheralFailedToConnect = { [weak self] failedPeripheral, error in
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guard failedPeripheral.identifier == self?.peripheral.identifier else { return }
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if let c = self?.connectionContinuation {
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self?.connectionContinuation = nil
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c.resume(throwing: error ?? ProvisionError.connectionTimeout)
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}
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}
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centralManager.connect(peripheral, options: nil)
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DispatchQueue.main.asyncAfter(deadline: .now() + GATTConstants.connectionTimeout) { [weak self] in
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if let c = self?.connectionContinuation {
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self?.connectionContinuation = nil
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c.resume(throwing: ProvisionError.connectionTimeout)
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}
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}
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}
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}
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private func discoverServices() async throws {
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try await withCheckedThrowingContinuation { (cont: CheckedContinuation<Void, Error>) in
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serviceContinuation = cont
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peripheral.discoverServices([GATTConstants.ffe0Service])
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DispatchQueue.main.asyncAfter(deadline: .now() + GATTConstants.operationTimeout) { [weak self] in
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if let c = self?.serviceContinuation {
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self?.serviceContinuation = nil
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c.resume(throwing: ProvisionError.serviceDiscoveryTimeout)
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}
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}
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}
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}
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/// Two-step DXSmart auth:
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/// 1. Send "555555" to FFE3 — fire and forget (WRITE_NO_RESPONSE) — enters config mode
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/// 2. Send "dx1234" to FFE3 — fire and forget — authenticates
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/// Matches Android enterConfigModeAndLogin(): both use WRITE_TYPE_NO_RESPONSE
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private func authenticate() async throws {
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guard let ffe3 = ffe3Char else {
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throw ProvisionError.characteristicNotFound
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}
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// Step 1: Trigger — fire and forget (matches Android's WRITE_TYPE_NO_RESPONSE)
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if let triggerData = Self.triggerPassword.data(using: .utf8) {
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peripheral.writeValue(triggerData, for: ffe3, type: .withoutResponse)
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try await Task.sleep(nanoseconds: 100_000_000) // 100ms (matches Android SDK timer)
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}
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// Step 2: Auth password — fire and forget
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if let authData = Self.defaultPassword.data(using: .utf8) {
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peripheral.writeValue(authData, for: ffe3, type: .withoutResponse)
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// 500ms settle after auth — beacon needs time to enter config mode,
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// especially if BLE stack was stressed by prior provisioner attempts
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try await Task.sleep(nanoseconds: 500_000_000)
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}
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}
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/// Write data to a characteristic and wait for ACK notification on FFE1
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private func writeToCharAndWaitACK(_ char: CBCharacteristic, data: Data, label: String) async throws {
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let _ = try await withCheckedThrowingContinuation { (cont: CheckedContinuation<Data, Error>) in
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responseContinuation = cont
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peripheral.writeValue(data, for: char, type: .withResponse)
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DispatchQueue.main.asyncAfter(deadline: .now() + GATTConstants.operationTimeout) { [weak self] in
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if let c = self?.responseContinuation {
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self?.responseContinuation = nil
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c.resume(throwing: ProvisionError.operationTimeout)
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}
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}
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}
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}
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/// Wait for a write callback (used for FFE3 password writes in old SDK path)
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private func waitForWriteCallback() async throws {
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try await withCheckedThrowingContinuation { (cont: CheckedContinuation<Void, Error>) in
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writeContinuation = cont
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DispatchQueue.main.asyncAfter(deadline: .now() + GATTConstants.operationTimeout) { [weak self] in
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if let c = self?.writeContinuation {
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self?.writeContinuation = nil
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c.resume(throwing: ProvisionError.operationTimeout)
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}
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Wait for a response notification with custom timeout
|
||
private func waitForResponse(timeout: TimeInterval) async throws -> Data {
|
||
try await withCheckedThrowingContinuation { (cont: CheckedContinuation<Data, Error>) in
|
||
responseContinuation = cont
|
||
|
||
DispatchQueue.main.asyncAfter(deadline: .now() + timeout) { [weak self] in
|
||
if let c = self?.responseContinuation {
|
||
self?.responseContinuation = nil
|
||
c.resume(throwing: ProvisionError.operationTimeout)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// MARK: - CBPeripheralDelegate
|
||
|
||
extension DXSmartProvisioner: CBPeripheralDelegate {
|
||
|
||
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
|
||
if let error {
|
||
serviceContinuation?.resume(throwing: error)
|
||
serviceContinuation = nil
|
||
return
|
||
}
|
||
|
||
guard let service = peripheral.services?.first(where: { $0.uuid == GATTConstants.ffe0Service }) else {
|
||
serviceContinuation?.resume(throwing: ProvisionError.serviceNotFound)
|
||
serviceContinuation = nil
|
||
return
|
||
}
|
||
|
||
peripheral.discoverCharacteristics(
|
||
[GATTConstants.ffe1Char, GATTConstants.ffe2Char, GATTConstants.ffe3Char],
|
||
for: service
|
||
)
|
||
}
|
||
|
||
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
|
||
if let error {
|
||
serviceContinuation?.resume(throwing: error)
|
||
serviceContinuation = nil
|
||
return
|
||
}
|
||
|
||
for char in service.characteristics ?? [] {
|
||
switch char.uuid {
|
||
case GATTConstants.ffe1Char:
|
||
ffe1Char = char
|
||
// FFE1 is used for notify (ACK responses)
|
||
if char.properties.contains(.notify) {
|
||
peripheral.setNotifyValue(true, for: char)
|
||
}
|
||
case GATTConstants.ffe2Char:
|
||
ffe2Char = char
|
||
case GATTConstants.ffe3Char:
|
||
ffe3Char = char
|
||
default:
|
||
break
|
||
}
|
||
}
|
||
|
||
// Need at least FFE1 (notify) + FFE3 (password)
|
||
// FFE2 is preferred for writes but optional (old firmware uses FFE1)
|
||
if ffe1Char != nil && ffe3Char != nil {
|
||
useNewSDK = (ffe2Char != nil)
|
||
serviceContinuation?.resume()
|
||
serviceContinuation = nil
|
||
} else {
|
||
serviceContinuation?.resume(throwing: ProvisionError.characteristicNotFound)
|
||
serviceContinuation = nil
|
||
}
|
||
}
|
||
|
||
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
|
||
guard let data = characteristic.value else { return }
|
||
|
||
if let cont = responseContinuation {
|
||
responseContinuation = nil
|
||
cont.resume(returning: data)
|
||
}
|
||
}
|
||
|
||
func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {
|
||
// Handle write callback for old SDK FFE3 password writes
|
||
if let cont = writeContinuation {
|
||
writeContinuation = nil
|
||
if let error {
|
||
cont.resume(throwing: error)
|
||
} else {
|
||
cont.resume()
|
||
}
|
||
return
|
||
}
|
||
|
||
// For command writes (FFE1/FFE2): the .withResponse write confirmation
|
||
// IS the ACK. Some commands (e.g. 0x61 Frame1_DevInfo) don't send a
|
||
// separate FFE1 notification, so we must resolve here on success too.
|
||
// If a notification also arrives later, responseContinuation will already
|
||
// be nil — harmless.
|
||
if let cont = responseContinuation {
|
||
responseContinuation = nil
|
||
if let error {
|
||
cont.resume(throwing: error)
|
||
} else {
|
||
cont.resume(returning: Data())
|
||
}
|
||
}
|
||
}
|
||
}
|