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@@ -2,22 +2,192 @@ package com.weightscalebridge
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import com.facebook.react.bridge.ReactApplicationContext
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import com.facebook.react.module.annotations.ReactModule
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import android.bluetooth.BluetoothAdapter
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import android.bluetooth.BluetoothManager
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import android.bluetooth.le.*
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import android.content.Context
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import android.content.pm.PackageManager
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import android.os.Build
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import android.os.CountDownTimer
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import androidx.core.content.ContextCompat
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import com.facebook.react.bridge.*
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import com.facebook.react.modules.core.DeviceEventManagerModule
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import kotlin.math.abs
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@ReactModule(name = WeightScaleBridgeModule.NAME)
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class WeightScaleBridgeModule(reactContext: ReactApplicationContext) :
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NativeWeightScaleBridgeSpec(reactContext) {
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class WeightScaleModule(reactContext: ReactApplicationContext) : ReactContextBaseJavaModule(reactContext) {
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override fun getName(): String {
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return NAME
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}
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override fun getName(): String = "WeightScale"
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// Example method
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// See https://reactnative.dev/docs/native-modules-android
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override fun multiply(a: Double, b: Double): Double {
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return a * b
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}
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private var bluetoothAdapter: BluetoothAdapter? = null
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private var scanner: BluetoothLeScanner? = null
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private var isScanning = false
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private var timer: CountDownTimer? = null
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companion object {
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const val NAME = "WeightScaleBridge"
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}
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}
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private var candidateKg: Double = Double.NaN
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private var stableSince: Long = 0L
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private val STABLE_WINDOW_MS = 4000L
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private val WEIGHT_TOL = 0.1
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private val MIN_VALID_KG = 5.0
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private val MAX_VALID_KG = 250.0
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private val MEASURE_WINDOW_MS = 20000L // 20 seconds timeout
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private val TARGET_MAC = "34:5C:F3:40:2C:D8" // Your scale MAC
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private fun sendEvent(eventName: String, params: WritableMap) {
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reactApplicationContext
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.getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter::class.java)
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.emit(eventName, params)
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}
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@ReactMethod
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fun startMeasuring() {
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if (isScanning) return
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val bluetoothManager = reactApplicationContext.getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
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bluetoothAdapter = bluetoothManager.adapter
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if (bluetoothAdapter == null || !bluetoothAdapter!!.isEnabled) {
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val params = Arguments.createMap().apply {
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putString("message", "Bluetooth is not enabled. Please turn it on in settings.")
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}
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sendEvent("onScaleError", params)
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return
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}
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if (!hasRequiredPermissions()) {
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val params = Arguments.createMap().apply {
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putString("message", "Required permissions not granted.")
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}
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sendEvent("onScaleError", params)
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return
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}
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scanner = bluetoothAdapter!!.bluetoothLeScanner
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// Reset stability tracking
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candidateKg = Double.NaN
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stableSince = 0L
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isScanning = true
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// Send initial status
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sendEvent("onStatusChange", Arguments.createMap().apply { putString("status", "scanning") })
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// Use filter for your specific scale MAC (more efficient)
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val scanFilter = ScanFilter.Builder()
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.setDeviceAddress(TARGET_MAC)
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.build()
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val scanFilters = listOf(scanFilter)
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val scanSettings = ScanSettings.Builder()
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.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
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.build()
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try {
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scanner!!.startScan(scanFilters, scanSettings, scanCallback)
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} catch (e: Exception) {
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val params = Arguments.createMap().apply { putString("message", e.message ?: "Scan start failed") }
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sendEvent("onScaleError", params)
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stopMeasuring()
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return
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}
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// 20-second timeout
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timer = object : CountDownTimer(MEASURE_WINDOW_MS, 1000) {
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override fun onTick(millisUntilFinished: Long) {
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// Optional: send remaining seconds if needed
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}
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override fun onFinish() {
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stopMeasuring()
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sendEvent("onStatusChange", Arguments.createMap().apply { putString("status", "timeout") })
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}
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}.start()
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}
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@ReactMethod
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fun stopMeasuring() {
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if (!isScanning) return
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try {
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scanner?.stopScan(scanCallback)
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} catch (e: Exception) {
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// Ignore
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}
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timer?.cancel()
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timer = null
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isScanning = false
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sendEvent("onStatusChange", Arguments.createMap().apply { putString("status", "stopped") })
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}
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private val scanCallback = object : ScanCallback() {
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override fun onScanResult(callbackType: Int, result: ScanResult?) {
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result ?: return
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val scanRecord = result.scanRecord ?: return
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val manufacturerData = scanRecord.manufacturerSpecificData
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if (manufacturerData != null && manufacturerData.size() > 0) {
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for (i in 0 until manufacturerData.size()) {
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val data = manufacturerData.valueAt(i) ?: continue
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if (data.size >= 2) {
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val tenths = ((data[0].toInt() and 0xFF) shl 8) or (data[1].toInt() and 0xFF)
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val kg = tenths / 10.0
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if (kg in MIN_VALID_KG..MAX_VALID_KG) {
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processWeight(kg)
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}
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}
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}
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}
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}
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override fun onScanFailed(errorCode: Int) {
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val params = Arguments.createMap().apply {
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putString("message", "Scan failed with code: $errorCode")
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}
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sendEvent("onScaleError", params)
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stopMeasuring()
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}
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}
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private fun processWeight(kg: Double) {
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// Send live weight update
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val liveParams = Arguments.createMap().apply { putDouble("weight", kg) }
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sendEvent("onLiveWeight", liveParams)
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// Update status to measuring
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sendEvent("onStatusChange", Arguments.createMap().apply { putString("status", "measuring") })
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val now = System.currentTimeMillis()
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// Stability detection
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if (candidateKg.isNaN() || abs(kg - candidateKg) > WEIGHT_TOL) {
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candidateKg = kg
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stableSince = now
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} else if (now - stableSince >= STABLE_WINDOW_MS) {
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// Stable weight achieved
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val stableParams = Arguments.createMap().apply { putDouble("weight", candidateKg) }
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sendEvent("onStableWeight", stableParams)
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sendEvent("onStatusChange", Arguments.createMap().apply { putString("status", "stable") })
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stopMeasuring()
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}
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}
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private fun hasRequiredPermissions(): Boolean {
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val perms = mutableListOf<String>()
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perms.add(android.Manifest.permission.ACCESS_FINE_LOCATION)
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
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perms.add(android.Manifest.permission.BLUETOOTH_SCAN)
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perms.add(android.Manifest.permission.BLUETOOTH_CONNECT)
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}
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return perms.all {
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ContextCompat.checkSelfPermission(reactApplicationContext, it) == PackageManager.PERMISSION_GRANTED
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}
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}
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override fun onCatalystInstanceDestroy() {
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super.onCatalystInstanceDestroy()
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stopMeasuring() // Cleanup when RN instance destroys
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}
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}
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