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// |
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// BTManager.swift |
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// USB Meter |
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// |
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// Created by Bogdan Timofte on 01/03/2020. |
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// Copyright © 2020 Bogdan Timofte. All rights reserved. |
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// |
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import CoreBluetooth |
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class BluetoothManager : NSObject, ObservableObject {
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private var manager: CBCentralManager! |
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// MARK: MacOS split advertisementData generating multiple discoveries with partial data: https://stackoverflow.com/questions/41628114/cbperipheral-advertisementdata-is-different-when-discovering-peripherals-on-osx. |
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#if targetEnvironment(macCatalyst) |
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private var advertisementDataCache = AdvertisementDataCache() |
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#endif |
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@Published var managerState = CBManagerState.unknown |
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override init () {
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super.init() |
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manager = CBCentralManager(delegate: self, queue: nil) |
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} |
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private func scanForMeters() {
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guard manager.state == .poweredOn else {
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track( "Scan requested but Bluetooth state is \(manager.state)") |
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return |
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} |
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//manager.scanForPeripherals(withServices: allBluetoothRadioServices(), options: [ CBCentralManagerScanOptionAllowDuplicatesKey: true ]) |
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manager.scanForPeripherals(withServices: allBluetoothRadioServices(), options: [ CBCentralManagerScanOptionAllowDuplicatesKey: true ]) |
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} |
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func discoveredMeter(peripheral: CBPeripheral, advertising advertismentData: [String : Any], rssi RSSI: NSNumber) {
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//track("discovered new USB Meter: (\(peripheral), advertsing \(advertismentData)")
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if let peripheralName = peripheral.name?.trimmingCharacters(in: .whitespacesAndNewlines) {
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if let kCBAdvDataManufacturerData = advertismentData["kCBAdvDataManufacturerData"] as? Data {
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// MARK: MAC Address |
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let macAddress = MACAddress(from: kCBAdvDataManufacturerData.suffix(from: 2)) |
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// MARK: Model |
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if let model = ModelByPeriferalName[peripheralName] {
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//track("Tetermided model for peripheral name: '\(peripheralName)'")
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// MARK: Known Meters Lookup |
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if appData.meters[peripheral.identifier] == nil {
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track("adding new USB Meter named '\(peripheralName)' with MAC Address: '\(macAddress)'")
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let btSerial = BluetoothSerial(peripheral: peripheral, radio: modelRadios[model] ?? .UNKNOWN, with: macAddress, managedBy: manager, RSSI: RSSI.intValue) |
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var m = appData.meters |
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m[peripheral.identifier] = Meter(model: model, with: btSerial) |
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appData.meters = m |
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} else {
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// track("Updating USB Meter: \(peripheral.identifier) ")
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peripheral.delegate?.peripheral?(peripheral, didReadRSSI: RSSI, error: nil) |
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} |
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} else {
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track("Unable to determine model for peripheral name: '\(peripheralName)'")
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} |
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} else {
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track("Insuficient data to use device!")
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} |
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} |
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else{
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track("Periferal: \(peripheral.identifier) does not have a name")
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} |
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} |
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} |
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extension BluetoothManager : CBCentralManagerDelegate {
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// MARK: CBCentralManager state Changed |
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func centralManagerDidUpdateState(_ central: CBCentralManager) {
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managerState = central.state; |
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track("\(central.state)")
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switch central.state {
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case .poweredOff: |
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track("Bluetooth is Off. How should I behave?")
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case .poweredOn: |
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track("Bluetooth is On... Start scanning...")
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// note that "didDisconnectPeripheral" won't be called if BLE is turned off while connected |
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// connectedPeripheral = nil |
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// pendingPeripheral = nil |
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DispatchQueue.global(qos: .userInitiated).async { [weak self] in
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self?.scanForMeters() |
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} |
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case .resetting: |
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track("Bluetooth is reseting... . Whatever that means.")
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case .unauthorized: |
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track("Bluetooth is not authorized.")
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case .unknown: |
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track("Bluetooth is in an unknown state.")
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case .unsupported: |
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track("Bluetooth not supported by device")
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default: |
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track("Bluetooth is in a state never seen before!")
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} |
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} |
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// MARK: MacOS multiple discoveries advertisementData caching |
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#if targetEnvironment(macCatalyst) |
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private class AdvertisementDataCache {
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fileprivate var map = [UUID: [String: Any]]() |
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func append(peripheral: CBPeripheral, advertisementData: [String: Any]) -> [String: Any] {
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var ad = (map[peripheral.identifier]) ?? [String: Any]() |
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for (key, value) in advertisementData {
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ad[key] = value |
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} |
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map[peripheral.identifier] = ad |
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return ad |
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} |
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func clear() {
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map.removeAll() |
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} |
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} |
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#endif |
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// MARK: CBCentralManager didDiscover peripheral |
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func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
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#if targetEnvironment(macCatalyst) |
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// MARK: MacOS probably assumes that if "kCBAdvDataIsConnectable" is not present in parial advertisment data it nust be 0 |
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// var ad = advertisementData |
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// if ( ad["kCBAdvDataManufacturerData"] == nil ) {
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// ad.removeValue(forKey: "kCBAdvDataIsConnectable") |
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// } |
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let completeAdvertisementData = self.advertisementDataCache.append(peripheral: peripheral, advertisementData: advertisementData) |
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#else |
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let completeAdvertisementData = advertisementData |
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#endif |
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//track("Device discoverded UUID: '\(peripheral.identifier)' named '\(peripheral.name ?? "Unknown")'); RSSI: \(RSSI) dBm; Advertisment data: \(advertisementData)")
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discoveredMeter(peripheral: peripheral, advertising: completeAdvertisementData, rssi: RSSI ) |
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} |
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// MARK: CBCentralManager didConnect peripheral |
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internal func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
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//track("Connected to peripheral: '\(peripheral.identifier)'")
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if let usbMeter = appData.meters[peripheral.identifier] {
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usbMeter.btSerial.connectionEstablished() |
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} |
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else {
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track("Connected to unknown meter with UUID: '\(peripheral.identifier)'")
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} |
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} |
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// MARK: CBCentralManager didDisconnectPeripheral peripheral |
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internal func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
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track("Disconnected from peripheral: '\(peripheral.identifier)' with error: \(error.debugDescription)")
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if let usbMeter = appData.meters[peripheral.identifier] {
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usbMeter.btSerial.connectionClosed() |
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} |
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else {
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track("Disconnected from unknown meter with UUID: '\(peripheral.identifier)'")
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} |
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} |
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} |
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// MARK: MacOS multiple discoveries advertisementData caching |
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#if targetEnvironment(macCatalyst) |
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private class AdvertisementDataCache {
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fileprivate var map = [UUID: [String: Any]]() |
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func append(peripheral: CBPeripheral, advertisementData: [String: Any]) -> [String: Any] {
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var ad = (map[peripheral.identifier]) ?? [String: Any]() |
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for (key, value) in advertisementData {
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ad[key] = value |
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} |
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map[peripheral.identifier] = ad |
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return ad |
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} |
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func clear() {
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map.removeAll() |
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} |
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} |
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#endif |