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我有一個mac設置爲使用CoreBluetooth作爲CBPeripheralManager的藍牙配件。 Mac在設置特徵CBUUID上進行廣告宣傳，一旦它擁有訂閱者，我點擊一個按鈕以每半秒流傳輸一個UTF-8編碼的時間戳。iOS BluetoothLE：CBCentralManager取消訂閱更新
我有一個iPhone設置爲CBCentralManager訂閱適當的特徵。每次接收數據和應用程序處於活動狀態時，我都會使用解碼的時間戳更新iPhone的UI。 bluetooth-central背景模式在.plist文件中設置。
iPhone繼續調試打印並更新約25秒的時間戳UI，然後停止。無論應用程序處於前景還是背景，都會發生這種情況。 編輯：CBPeripheralManager此時收到一個didUnsubscribeFrom characteristic回調。我沒有看到任何理由didUnsubscribeFrom會被調用，不知道爲什麼它總是在25秒後。
CBPeripheralManager繼續愉快地發送它的時間戳。來自CBPeripheralManager的updateData(_:for:onSubscribedCentrals:)調用的返回值始終爲真，表示隊列永遠不會滿。
這裏涉及很多代碼，顯示最相關的代碼。
從CBCentralManager應用：
func centralManagerDidUpdateState(_ central: CBCentralManager) {
print(central.state.rawValue)
centralManager.scanForPeripherals(withServices: [timeUUID], options: nil)
print("scanning")
}
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
peripheral.delegate = self
peripheral.discoverServices(nil)
print("connected")
}
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
print(peripheral.name as Any)
print(advertisementData[CBAdvertisementDataServiceUUIDsKey] as! Array<CBUUID>)
self.peripheralController = peripheral
self.centralManager.connect(peripheral, options: nil)
}
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
if service.uuid.uuidString == timeUUID.uuidString {
peripheralController.setNotifyValue(true, for: service.characteristics!.first!)
peripheralController.readValue(for: service.characteristics!.first!) // EDIT: This was the offending line
}
}
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
if characteristic.uuid.uuidString == timeUUID.uuidString {
if let valueFrom = characteristic.value {
if let this = String(data: valueFrom, encoding: .utf8) {
if UIApplication.shared.applicationState == .active {
label.text = this
print("ACTIVE \(this)")
} else if UIApplication.shared.applicationState == .background {
print("BACKGROUND \(this)")
} else if UIApplication.shared.applicationState == .inactive {
print("INACTIVE \(this)")
}
}
}
}
}
從CBPeripheralManager應用：
func peripheralManagerDidUpdateState(_ peripheral: CBPeripheralManager) {
myCharacteristic = CBMutableCharacteristic(type: myServiceUUID, properties: [CBCharacteristicProperties.read, CBCharacteristicProperties.notify], value: nil, permissions: CBAttributePermissions.readable)
let myService = CBMutableService(type: myServiceUUID, primary: true)
myService.characteristics = [myCharacteristic]
bluetoothController.add(myService)
}
func peripheralManager(_ peripheral: CBPeripheralManager, central: CBCentral, didSubscribeTo characteristic: CBCharacteristic) {
print(characteristic.uuid)
subscriber = central
}
func peripheralManager(_ peripheral: CBPeripheralManager, central: CBCentral, didUnsubscribeFrom characteristic: CBCharacteristic) {
print(characteristic)
print("unsubscribe")
}
func repeatAdvertisement() {
timer = Timer.scheduledTimer(withTimeInterval: 0.5, repeats: true) { [unowned self] (timerRef) in
guard let maybeTimer = self.timer, maybeTimer.isValid else { return }
let datum = Date()
let stringFromDate = self.dateFormatter.string(from: datum)
let data = stringFromDate.data(using: .utf8)
print(data!.count)
// myCharacteristic.value = data
let myService = CBMutableService(type: self.myServiceUUID, primary: true)
myService.characteristics = [self.myCharacteristic]
let did = self.bluetoothController.updateValue(data!, for: self.myCharacteristic as! CBMutableCharacteristic, onSubscribedCentrals: [self.subscriber])
print("timed \(stringFromDate) \(did)")
}
}
func advertise() {
if timer == nil {
repeatAdvertisement()
} else {
timer?.invalidate()
timer = nil
}
}
讓我知道你還需要什麼。