ios - 外围设备服务在所有 BLE Scanner iOS 应用程序中显示为零，但在安卓代码中不显示

Question

部件号:CC2640R2F

工具/软件:Code Composer Studio

我正在做一个项目，在我的项目中，CC2640R2F 正在执行广告和扫描。我正在使用自定义 BLE 服务从应用程序(Android 或 iOS)接收数据到 CC2640R2F。每当我在 android 中将设备与 BLE 扫描仪连接时，我都会获得所有服务和所有特性，而且我也能够毫无问题地发送和接收数据。这也适用于我的自定义 android 应用程序。

但每当我在 iOS 应用程序中将 CC2640R2F 设备与 BLE 扫描仪连接时，设备就会连接，但我在应用程序中没有获得任何服务或特征。同样的情况也发生在我们开发的自定义 ios 应用程序上。为什么会这样？如果我在 Android 上获得了所有东西，那么这也应该适用于 iOS。

BLE scanner 安卓应用截图:

iOS 应用 BLE 扫描仪

检查蓝牙是否开机并扫描外围设备的代码:[![检查蓝牙是否开机并扫描外设的代码][3]][3]

如果找到外围设备，连接到设备的代码:[![如果找到外围设备则连接到设备的代码][4]][4]

连接设备后搜索服务的代码(如果找到服务，它将打破计时器()，否则再次搜索服务):

func centralManagerDidUpdateState(_ central: CBCentralManager) { print("--- centralManagerDidUpdateState")

    if central.state == CBManagerState.poweredOn {
        debugPrint("poweredOn")

        let serviceUUIDs:[AnyObject] = [serviceCBUUID_READ]
        let lastPeripherals = centralManager.retrieveConnectedPeripherals(withServices: serviceUUIDs as! [CBUUID])

        if lastPeripherals.count > 0{
            let device = lastPeripherals.last! as CBPeripheral;
            deviceX = device;
            centralManager.connect(deviceX, options: nil)
            if(device.state == .disconnected){
                self.alertShowing(msg: "Device is disconnected restart the device and connect again.")
            }
        }
        else {
            centralManager.scanForPeripherals(withServices: nil, options: nil)
        }

        debugPrint(lastPeripherals)
    } else if(central.state == CBManagerState.poweredOff) {
        self.alertShowing(msg: "Make sure that your bluetooth is turned on.")
    }
    else if(central.state == CBManagerState.unsupported) {
        self.alertShowing(msg: "This device is unsupported.")
    }else{
        self.alertShowing(msg: "Try again after restarting the device.")
    }
}

//DidDiscoverPeripheral

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
    if(peripheral.name == "Peripheral Observer") || (peripheral.name == "BLE Device"){
        if let services = peripheral.services{
            for service in services{
                debugPrint(service)
            }
        }
        debugPrint("advertisementData :\(advertisementData)")
        deviceX = peripheral
        peripheral.delegate = self
        centralManager.stopScan()
        centralManager.connect(peripheral)
    }
}

//didConnect 内部

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
    debugPrint("Connected")
    var i = 0
    timerForService = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { (timer) in
        if(self.service_Read == nil) && (self.service_Write == nil){
            i += 1

            if(i%2 == 1){
                debugPrint("loop1")
                peripheral.discoverServices(nil)
                self.deviceX!.discoverServices(nil)
            }else if( i&2 == 0){
                debugPrint("loop0")
                self.deviceX!.discoverServices([self.serviceCBUUID_READ, self.serviceCBUUID_Write])
            }

        }else{
            self.timerForService.invalidate()
        }
    })
}

Answer 1

您在 iOS Central 中使用错误的方式发现 BLE 服务。 (恐怕我的回复是用 Objective-c 写的，但是，它给了你要点并且转换到 Swift 会很容易)

您必须定义一个全局CBPeriphal 实例并在您的代码中使用它

@interface CentralManager()
property (nonatomic, strong) CBPeripheral *golablePeripheral;
@end

- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI {
    self.golablePeripheral = peripheral;
    self.golablePeripheral.delegate = self;
}

然后，一旦获得连接的委托(delegate)，您就可以开始发现您的服务:

- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral {
    [self.golablePeripheral discoverServices: _serviceUUID];
}

然后，您将获得以下委托(delegate)。是时候开始发现特征了:

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error {
    for (CBService *service in peripheral.services) {
        if ([_serviceUUID containsObject: service.UUID]) {
            [self.golablePeripheral discoverCharacteristics:_serviceCharacteristics forService:service];
            [self.golablePeripheral discoverCharacteristics:_serviceNotifyCharacteristics forService:service];
        }
    }
}

我强烈建议您使用 BluetoothLEManager用于您的 BLE 相关项目。我已经在我的几个企业项目中使用过它。