@hangtime/grip-connect-react-native
Version:
React Native module for Grip Connect devices
96 lines • 4.14 kB
JavaScript
import { BleManager, Device } from "react-native-ble-plx";
import { WHC06 as WHC06Base } from "@hangtime/grip-connect";
import { Buffer } from "buffer";
/**
* Represents a Weiheng - WH-C06 (or MAT Muscle Meter) device.
* To use this device enable: `chrome://flags/#enable-experimental-web-platform-features`.
* {@link https://googlechrome.github.io/samples/web-bluetooth/scan.html| Web Bluetooth}
* {@link https://weihengmanufacturer.com}
*/
export class WHC06 extends WHC06Base {
manager;
device;
constructor() {
super();
this.manager = new BleManager();
}
base64ToHex(base64) {
const binary = Buffer.from(base64, "base64").toString("binary");
return Array.from(binary)
.map((char) => char.charCodeAt(0).toString(16).padStart(2, "0"))
.join("");
}
parseWeightData(manufacturerData) {
if (!manufacturerData)
return 0;
try {
const hexData = this.base64ToHex(manufacturerData);
const weightHex = hexData.substring(24, 28);
return parseInt(weightHex, 16) / 100;
}
catch (error) {
console.error("Error parsing weight data:", error);
return 0;
}
}
connect = async (onSuccess = () => console.log("Connected successfully"), onError = (error) => console.error(error)) => {
try {
let hasReportedSuccess = false;
this.manager.startDeviceScan(null, {
allowDuplicates: true, // By allowing duplicates scanning records are received more frequently [iOS only]
scanMode: 2, // Scan mode for Bluetooth LE scan [Android only]
callbackType: 1, // Scan callback type for Bluetooth LE scan [Android only]
}, (error, scannedDevice) => {
if (error) {
onError(error);
return;
}
if (!scannedDevice || (scannedDevice.localName !== "IF_B7" && scannedDevice.name !== "IF_B7")) {
return;
}
// Check if we received data
const manufacturerData = scannedDevice.manufacturerData;
if (!manufacturerData) {
return;
}
// Update timestamp
this.updateTimestamp();
// Device has no services / characteristics, so we directly call onSuccess
if (!hasReportedSuccess) {
hasReportedSuccess = true;
onSuccess();
}
// Handle received data
this.currentSamplesPerPacket = 1;
this.recordPacketReceived();
const receivedTime = Date.now();
const receivedData = this.parseWeightData(manufacturerData);
// Tare correction
const numericData = receivedData - this.applyTare(receivedData) * -1;
const currentMassTotal = Math.max(-1000, numericData);
// Update session stats before building packet
this.peak = Math.max(this.peak, numericData);
this.min = Math.min(this.min, Math.max(-1000, numericData));
this.sum += currentMassTotal;
this.dataPointCount++;
this.mean = this.sum / this.dataPointCount;
// Add data to downloadable Array
this.downloadPackets.push(this.buildDownloadPacket(currentMassTotal, [numericData], {
timestamp: receivedTime,
sampleIndex: this.dataPointCount,
}));
// Check if device is being used
this.activityCheck(numericData);
// Notify with weight data
this.notifyCallback(this.buildForceMeasurement(currentMassTotal));
});
}
catch (error) {
onError(error);
}
};
download = async () => {
throw new Error("Download is not supported on React Native");
};
}
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