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@Naveen-spritle
Last active June 22, 2023 11:17
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Connecting the BLE weighing device by using device ID and get the displaying weight value of weighing device
const [connectedDevice, setConnectedDevice] = useState(null);
const [connectedDeviceServices, setConnectedDeviceServices] = useState(null);
useEffect(() => {
let moniterCharacteristic;
let unSubscribeListener;
if (connectedDevice && connectedDeviceServices) {
// Device disconnect listener
unSubscribeListener = connectedDevice.onDisconnected((error, device) => {
alert("Device disconnected");
setConnectedDevice(null);
setConnectedDeviceServices(null);
});
connectedDeviceServices.forEach((service_data, index) => {
connectedDevice
.characteristicsForService(service_data.uuid)
.then((characteristics) => {
characteristics.forEach((characteristic_data) => {
if (characteristic_data.isNotifiable) {
moniterCharacteristic =
connectedDevice.monitorCharacteristicForService(
characteristic_data.serviceUUID,
characteristic_data.uuid,
(error, characteristic) => {
// error handling
if (error || !characteristic) {
alert(
"Something went wrong in moniter the characteristic"
);
return;
} else if (characteristic) {
var value = base64.decode(characteristic.value); // base64 is import from "react-native-base64" library for convert the base64 format to human readable string format
console.log(value) // Displaying value of weighing device
}
}
);
}
});
})
.catch((error) => {
alert(
"Something went wrong in get the characteristics for service"
);
});
});
}
return () => {
moniterCharacteristic && moniterCharacteristic.remove();
unSubscribeListener && unSubscribeListener.remove();
};
}, [connectedDevice, connectedDeviceServices]);
//Connect BLE weighing device
const connectWeightMachine = (deviceId) => {
_BleManager
.connectToDevice(deviceId, { autoConnect: false })
.then((device) => {
console.log("connected");
console.log("device data - ",device)
device.discoverAllServicesAndCharacteristics().then(() => {
device
.services()
.then((device_services) => {
console.log("device services", device_services)
setConnectedDevice(device);
setConnectedDeviceServices(device_services);
})
.catch((error) => {
console.log("service error ", error);
alert("Getting BLE service error");
});
});
})
.catch((error) => {
console.log("connect device error ", error);
alert("Connect to device error");
});
};
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