I'm using React Native and the BLE package react-native-ble-plx on my Ubuntu machine.
According to the docs, I've done the following:
1. Scanned for devices
2. Connected to device
3. device.discoverAllServicesAndCharacteristics
4. writeCharacteristicWithResponseForDevice
My problem lies in reading the response I get from sending my command.
RX characteristic is writable, but TX is only notifiable and not readable. Therefore I need to monitor the characteristic with monitorCharacteristicForDevice, however I can't get this to function.
I never recieve neither 'monitor success', 'Error at receiving data from device' nor 'Monitor failure' in the code below.
How do I read the return?
monitorDevice = () => { this.setState({monitoring: true}) console.log(this.state.servicesDiscovered) if(this.state.servicesDiscovered){ {this.manager.monitorCharacteristicForDevice(this.state.connectedTo, SERVICE_UUID, TX_CHARACTERISTIC, (error, characteristic) => { if (error) { console.error("Error at receiving data from device", error); return } else { this.setState({monitoring: true}) console.log('monitor success') console.log('monitor success' + characteristic.value); this.state.messagesRecieved.push(characteristic.value) } }) } } else{ console.log("Monitor failure") }} checkBattery = () => { if(this.state.monitoring){ this.manager.writeCharacteristicWithResponseForDevice(this.state.connectedTo, SERVICE_UUID, RX_CHARACTERISTIC, "YmF0dGVyeQ==") .then(characteristic => { console.log("Successfully sent: " + characteristic.value) return }) .catch(err => { console.log(err) }) } else{ alert("Not monitoring") }}
