1

问题：

我正在尝试连接到我的蓝牙设备，但是在连接并发现所有服务和特性后，由于返回的信息不足，我无法前进。我没有收到任何服务 UUID，也没有收到任何特征 UUID。

我需要做什么才能访问 UUID，然后才能读取特征？

我试过的：

通话后我的设备device.discoverAllServicesAndCharacteristics();返回：

{ _40: 0, _65: 0, _55: null, _72: null }

当我登录时，device我得到：

06-23 16:36:54.758  4397  4597 I ReactNativeJS: { isConnectable: null,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:   rssi: null,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:   serviceData: null,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:   overflowServiceUUIDs: null,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:   mtu: 23,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:   localName: null,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:   manufacturerData: null,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:   txPowerLevel: null,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:   id: '00:1E:C0:65:D7:DB',
06-23 16:36:54.758  4397  4597 I ReactNativeJS:   solicitedServiceUUIDs: null,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:   name: 'RND7DB',
06-23 16:36:54.758  4397  4597 I ReactNativeJS:   serviceUUIDs: null,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:   _manager:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:    { _eventEmitter:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:       { _subscriber:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:          { _subscriptionsForType:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:             { appStateDidChange:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                [ { subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    emitter:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                     { _subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       isAvailable: true,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       _eventHandlers: { change: {}, memoryWarning: {} },
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       currentState: 'active' },
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    listener: [Function],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    context: undefined,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    eventType: 'appStateDidChange',
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    key: 0 } ],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:               websocketMessage: [ , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,  ],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:               websocketOpen: [ , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,  ],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:               websocketClosed: [ , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,  ],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:               websocketFailed: [ , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,  ],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:               didUpdateDimensions:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                [ { subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    emitter:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                     { _subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       sharedSubscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       _currentSubscription: null },
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    listener: [Function],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    context: undefined,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    eventType: 'didUpdateDimensions',
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    key: 0 } ],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:               hardwareBackPress:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                [ { subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    emitter:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                     { _subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       sharedSubscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       _currentSubscription: null },
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    listener: [Function],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    context: undefined,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    eventType: 'hardwareBackPress',
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    key: 0 } ],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:               collectBugExtraData:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                [ { subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    emitter:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                     { _subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       sharedSubscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       _currentSubscription: null },
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    listener: [Function: collectExtraData],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    context: null,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    eventType: 'collectBugExtraData',
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    key: 0 } ],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:               collectRedBoxExtraData:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                [ { subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    emitter:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                     { _subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       sharedSubscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       _currentSubscription: null },
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    listener: [Function: collectExtraData],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    context: null,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    eventType: 'collectRedBoxExtraData',
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    key: 0 } ],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:               url:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                [ { subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    emitter: { _subscriber: [Circular] },
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    listener: [Function],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    context: undefined,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    eventType: 'url',
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    key: 0 },
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                  { subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    emitter: { _subscriber: [Circular] },
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    listener: [Function],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    context: undefined,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    eventType: 'url',
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    key: 1 } ],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:               toggleElementInspector:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                [ { subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    emitter:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                     { _subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       sharedSubscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       _currentSubscription: null },
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    listener: [Function],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    context: undefined,
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    eventType: 'toggleElementInspector',
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    key: 0 },
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                  { subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                    emitter:
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                     { _subscriber: [Circular],
06-23 16:36:54.758  4397  4597 I ReactNativeJS:                       sharedSubscribe

在这一点上，我不知道该怎么做，因为我没有收到任何有价值的信息来进一步从特征中获取信息。

根据文档，我需要 UUID 从我的设备中读取。

device.readCharacteristicForService(
  serviceUUID: UUID,
  characteristicUUID: UUID,
  transactionId: ?TransactionId
): Promise<Characteristic>

注意：当我在 android 上使用 Ble Scanner 应用程序时，我能够使用它们的 UUID 接收所有服务和特征。

代码片段：

    @action connect = (deviceName) => {

        const device = this.devices.find(device=>device.name === deviceName);

        if(device === undefined){
            this.info = "Couldn't find device";
            return;
        }

        this.manager.stopDeviceScan();
        this.selectedDevice = device;
        this.selectedDevice
            .connect()
            .then((device) => {
                this.info = "Discovering services and characteristics";
                return device.discoverAllServicesAndCharacteristics();
            })
            .then((device) => {
                this.info = "Setting notifications";
                return this.setupNotifications(device)
            })
            .then(() => {
                this.info = "Listening..."
            }, (error) => {
                this.info = error.message;
            })
    };

 async setupNotifications(device) {
    console.log(device);
    console.log(this.manager.servicesForDevice(device.id));
}

github问题#293

4

1 回答 1

4

以下是我的使用方法，希望对你有帮助

 const { updateCharacteristic } = this.props
 const connectedDevice = await manager.connectToDevice(device.id)
 const services = await connectedDevice.discoverAllServicesAndCharacteristics()
 const characteristic = await this.getServicesAndCharacteristics(services)

getServicesAndCharacteristics(device) {
            return new Promise((resolve, reject) => {
                device.services().then(services => {
                    const characteristics = []

                    services.forEach((service, i) => {
                        service.characteristics().then(c => {
                            characteristics.push(c)

                            if (i === services.length - 1) {
                                const temp = characteristics.reduce(
                                    (acc, current) => {
                                        return [...acc, ...current]
                                    },
                                    []
                                )
                                const dialog = temp.find(
                                    characteristic =>
                                        characteristic.isWritableWithoutResponse
                                )
                                if (!dialog) {
                                    reject('No writable characteristic')
                                }
                                resolve(dialog)
                            }
                        })
                    })
                })
            })
        }

此致。

于 2018-06-24T10:53:00.307 回答