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javascript - 如何使用react-native-ble-plx发现服务UUID和特征UUID?

转载 作者:行者123 更新时间:2023-12-01 01:56:29 46 4
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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征后,我无法继续前进,因为返回的信息不足。我没有收到任何服务 UUID 或任何特征 UUID。

我需要做什么才能访问 UUID,然后才能读取特征?

我尝试过的:

调用 device.discoverAllServicesAndCharacteristics(); 后我的设备返回:

{ _40: 0, _65: 0, _55: 空, _72: 空 }

当我登录设备时,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

此时,我不知道该怎么办,因为我没有收到任何有值(value)的信息来进一步从特征中获取信息。

根据docs ,我需要从我的设备读取 UUID。

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,我能够通过其 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 issue #293

最佳答案

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)
}
})
})
})
})
}

致以诚挚的问候。

关于javascript - 如何使用react-native-ble-plx发现服务UUID和特征UUID?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51002338/

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