Add BLE BPL scale native module and BMI integration

.gitignore

@@ -75,8 +75,6 @@ android/keystores/debug.keystore
 # Turborepo
 .turbo/
 
-# generated by bob
-lib/
 
 # React Native Codegen
 ios/generated

android/src/main/AndroidManifest.xml

@@ -1,2 +1,8 @@
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
+<uses-permission android:name="android.permission.BLUETOOTH" />
+<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+<uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
 </manifest>

android/src/main/java/com/bplscale/BodyFat.kt

@@ -0,0 +1,105 @@
+package com.bplscale
+
+/**
+ * BodyFat calculation wrapper
+ * Loads the native libbodyfat.so library
+ */
+object BodyFat {
+    init {
+        System.loadLibrary("bodyfat") // libbodyfat.so
+    }
+
+    external fun getVersion(): String
+    external fun getAuthToken(): String
+
+    /**
+     * Calculate body fat percentage
+     * @param sex Boolean - true for female, false for male
+     * @param age Float - user age
+     * @param cm Float - height in cm
+     * @param wtkg Float - weight in kg
+     * @param imp Float - body impedance (Ohm)
+     * @param althlevel Int - athletic level (keep 0)
+     * @return Float - body fat percentage
+     */
+    external fun getFat(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate total body water (TBW)
+     */
+    external fun getTbw(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate muscle mass percentage
+     */
+    external fun getMus(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate bone mass percentage
+     */
+    external fun getBone(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate basal metabolic rate (BMR) in Kcal
+     */
+    external fun getKcal(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate visceral fat
+     */
+    external fun getVfat(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate body age
+     */
+    external fun getBage(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate best weight
+     */
+    external fun getBestWeight(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate BMI (Body Mass Index)
+     */
+    external fun getBMI(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate protein percentage
+     */
+    external fun getProtein(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate weight without fat (lean body mass)
+     */
+    external fun getWeightWithoutFat(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate obesity rate
+     * obeserate = (actual weight - best weight) / best weight
+     *
+     * Evaluation:
+     * < 10.0    - Healthy
+     * < 20.0    - Over weight
+     * < 30.0    - Mildly obese
+     * < 50.0    - Moderate obesity
+     * > 50      - Severe obesity
+     */
+    external fun getObeseRate(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate body score (0-100)
+     */
+    external fun getScore(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+
+    /**
+     * Calculate body shape type
+     *
+     * < 0.5     - Lean type
+     * < 1.5     - Normal type
+     * < 2.5     - Over weight type
+     * < 3.5     - Over fat
+     * > 3.5     - Obese
+     */
+    external fun getBodyShape(sex: Boolean, age: Float, cm: Float, wtkg: Float, imp: Float, althlevel: Int): Float
+}

android/src/main/java/com/bplscale/BplScaleModule.kt

@@ -1,20 +1,133 @@
 package com.bplscale
 
-import com.facebook.react.bridge.ReactApplicationContext
+import android.bluetooth.BluetoothAdapter
+import android.bluetooth.BluetoothManager
+import android.bluetooth.le.BluetoothLeScanner
+import android.bluetooth.le.ScanCallback
+import android.bluetooth.le.ScanResult
+import android.bluetooth.le.ScanSettings
+import android.content.Context
+import android.os.Handler
+import android.os.Looper
+import com.facebook.react.bridge.*
 import com.facebook.react.module.annotations.ReactModule
 
 @ReactModule(name = BplScaleModule.NAME)
-class BplScaleModule(reactContext: ReactApplicationContext) :
+class BplScaleModule(
-  NativeBplScaleSpec(reactContext) {
+    reactContext: ReactApplicationContext
+) : ReactContextBaseJavaModule(reactContext) {
 
-  override fun getName(): String {
+    private val bluetoothAdapter: BluetoothAdapter? by lazy {
-    return NAME
+        val manager =
+            reactContext.getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
+        manager.adapter
     }
 
-  // Example method
+    private var scanner: BluetoothLeScanner? = null
-  // See https://reactnative.dev/docs/native-modules-android
+    private var scanCallback: ScanCallback? = null
-  override fun multiply(a: Double, b: Double): Double {
+
-    return a * b
+    override fun getName(): String = NAME
+
+    data class ScaleData(val weight: Float, val impedance: Float)
+
+    /**
+     * Scan BLE devices and return weight and impedance
+     */
+    @ReactMethod
+    fun scanDevices(scanDurationMs: Int, promise: Promise) {
+        val adapter = bluetoothAdapter
+        if (adapter == null || !adapter.isEnabled) {
+            promise.reject("BLE_DISABLED", "Bluetooth is disabled")
+            return
+        }
+
+        scanner = adapter.bluetoothLeScanner
+        if (scanner == null) {
+            promise.reject("BLE_ERROR", "BLE scanner unavailable")
+            return
+        }
+
+        val devicesMap = HashMap<String, WritableMap>()
+        val resultArray = Arguments.createArray()
+
+        val settings = ScanSettings.Builder()
+            .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
+            .setCallbackType(ScanSettings.CALLBACK_TYPE_ALL_MATCHES)
+            .build()
+
+        scanCallback = object : ScanCallback() {
+            override fun onScanResult(callbackType: Int, result: ScanResult) {
+                processDevice(result, devicesMap)
+            }
+
+            override fun onBatchScanResults(results: MutableList<ScanResult>) {
+                results.forEach { processDevice(it, devicesMap) }
+            }
+
+            override fun onScanFailed(errorCode: Int) {
+                promise.reject("BLE_SCAN_FAILED", "Scan failed with code $errorCode")
+            }
+
+            private fun processDevice(result: ScanResult, map: HashMap<String, WritableMap>) {
+                val device = result.device ?: return
+                val address = device.address ?: return
+                val scanRecord = result.scanRecord?.bytes ?: return
+
+                val scaleData = parseScaleData(scanRecord) ?: return
+
+                if (!map.containsKey(address)) {
+                    val deviceMap = Arguments.createMap()
+                    deviceMap.putString("name", device.name ?: "")
+                    deviceMap.putString("address", address)
+                    deviceMap.putDouble("weight", scaleData.weight.toDouble())
+                    deviceMap.putDouble("impedance", scaleData.impedance.toDouble())
+                    map[address] = deviceMap
+                }
+            }
+        }
+
+        scanner?.startScan(null, settings, scanCallback)
+
+        Handler(Looper.getMainLooper()).postDelayed({
+            scanner?.stopScan(scanCallback)
+            devicesMap.values.forEach { resultArray.pushMap(it) }
+            promise.resolve(resultArray)
+        }, scanDurationMs.toLong())
+    }
+
+    // ────── Parse weight and impedance from advertising packet ──────
+    private fun parseScaleData(scanRecord: ByteArray): ScaleData? {
+        var i = 0
+        while (i < scanRecord.size - 2) {
+            val len = scanRecord[i].toInt() and 0xFF
+            if (len == 0) break
+            val type = scanRecord[i + 1].toInt() and 0xFF
+            if (type == 0xFF && i + len <= scanRecord.size) {
+                val mfg = scanRecord.copyOfRange(i + 2, i + 1 + len)
+                if (mfg.size >= 15) {
+                    val flag = mfg[0].toInt() and 0xFF
+                    return when (flag) {
+                        0xC0 -> parseV30Protocol(mfg)
+                        0xCA -> parseV21Protocol(mfg)
+                        else -> null
+                    }
+                }
+            }
+            i += len
+        }
+        return null
+    }
+
+    private fun parseV30Protocol(data: ByteArray): ScaleData {
+        val weight = ((data[2].toInt() and 0xFF) shl 8 or (data[3].toInt() and 0xFF)) / 10f
+        val impedance = ((data[4].toInt() and 0xFF) shl 8 or (data[5].toInt() and 0xFF)) / 10f
+        return ScaleData(weight, impedance)
+    }
+
+    private fun parseV21Protocol(data: ByteArray): ScaleData {
+        val weight = ((data[10].toInt() and 0xFF) shl 8 or (data[11].toInt() and 0xFF)) / 10f
+        val impedance = ((data[12].toInt() and 0xFF) shl 8 or (data[13].toInt() and 0xFF)) / 10f
+        return ScaleData(weight, impedance)
     }
 
     companion object {

android/src/main/java/com/bplscale/BplScalePackage.kt

@@ -1,33 +1,19 @@
 package com.bplscale
 
-import com.facebook.react.BaseReactPackage
+import com.facebook.react.ReactPackage
 import com.facebook.react.bridge.NativeModule
 import com.facebook.react.bridge.ReactApplicationContext
-import com.facebook.react.module.model.ReactModuleInfo
+import com.facebook.react.uimanager.ViewManager
-import com.facebook.react.module.model.ReactModuleInfoProvider
-import java.util.HashMap
 
-class BplScalePackage : BaseReactPackage() {
+class BplScalePackage : ReactPackage {
-  override fun getModule(name: String, reactContext: ReactApplicationContext): NativeModule? {
+
-    return if (name == BplScaleModule.NAME) {
+    override fun createNativeModules(reactContext: ReactApplicationContext): List<NativeModule> {
-      BplScaleModule(reactContext)
+        // Return a list with your BplScaleModule
-    } else {
+        return listOf(BplScaleModule(reactContext))
-      null
-    }
     }
 
-  override fun getReactModuleInfoProvider(): ReactModuleInfoProvider {
+    override fun createViewManagers(reactContext: ReactApplicationContext): List<ViewManager<*, *>> {
-    return ReactModuleInfoProvider {
+        // No custom view managers for this module
-      val moduleInfos: MutableMap<String, ReactModuleInfo> = HashMap()
+        return emptyList()
-      moduleInfos[BplScaleModule.NAME] = ReactModuleInfo(
-        BplScaleModule.NAME,
-        BplScaleModule.NAME,
-        false,  // canOverrideExistingModule
-        false,  // needsEagerInit
-        false,  // isCxxModule
-        true // isTurboModule
-      )
-      moduleInfos
-    }
     }
 }

example/android/settings.gradle

@@ -1,6 +1,6 @@
-pluginManagement { includeBuild("../node_modules/@react-native/gradle-plugin") }
+pluginManagement { includeBuild("../../node_modules/@react-native/gradle-plugin") }
 plugins { id("com.facebook.react.settings") }
 extensions.configure(com.facebook.react.ReactSettingsExtension){ ex -> ex.autolinkLibrariesFromCommand() }
 rootProject.name = 'bplscale.example'
 include ':app'
-includeBuild('../node_modules/@react-native/gradle-plugin')
+includeBuild('../../node_modules/@react-native/gradle-plugin')

package.json

@@ -2,16 +2,8 @@
   "name": "react-native-bpl-scale",
   "version": "0.1.0",
   "description": "React Native Bluetooth BPL weighing scale library",
-  "main": "./lib/module/index.js",
+  "main": "lib/module/index.js",
-  "types": "./lib/typescript/src/index.d.ts",
+  "types": "lib/typescript/src/index.d.ts",
-  "exports": {
-    ".": {
-      "source": "./src/index.tsx",
-      "types": "./lib/typescript/src/index.d.ts",
-      "default": "./lib/module/index.js"
-    },
-    "./package.json": "./package.json"
-  },
   "files": [
     "src",
     "lib",
@@ -32,7 +24,7 @@
     "!**/.*"
   ],
   "scripts": {
-    "example": "yarn workspace react-native-bpl-scale-example",
+    "example": "npm --prefix example run android",
     "clean": "del-cli android/build example/android/build example/android/app/build example/ios/build lib",
     "prepare": "bob build",
     "typecheck": "tsc"
@@ -46,7 +38,7 @@
     "type": "git",
     "url": "git+.git"
   },
-  "author": " <> ()",
+  "author": "",
   "license": "MIT",
   "bugs": {
     "url": "/issues"
@@ -62,7 +54,6 @@
     "react": "19.2.0",
     "react-native": "0.83.0",
     "react-native-builder-bob": "^0.40.13",
-    "turbo": "^2.5.6",
     "typescript": "^5.9.2"
   },
   "peerDependencies": {

react-native-bpl-scale/android/build.gradle

@@ -0,0 +1,27 @@
+apply plugin: "com.android.library"
+apply plugin: "org.jetbrains.kotlin.android"
+
+android {
+    namespace "com.bplscale"
+    compileSdk 34
+
+    defaultConfig {
+        minSdk 24
+        targetSdk 34
+    }
+
+    buildFeatures {
+        buildConfig true
+    }
+
+    sourceSets {
+        main {
+            jniLibs.srcDirs = ['src/main/jniLibs']
+        }
+    }
+}
+
+dependencies {
+    implementation "com.facebook.react:react-android"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib"
+}

react-native-bpl-scale/android/src/main/AndroidManifest.xml

@@ -0,0 +1 @@
+<manifest package="com.bplscale" />

react-native-bpl-scale/android/src/main/java/com/bplscale/BPLScaleModule.kt

@@ -0,0 +1,19 @@
+package com.bplscale
+
+import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.module.annotations.ReactModule
+import com.facebook.react.turbomodule.core.interfaces.TurboModule
+
+@ReactModule(name = BPLScaleModule.NAME)
+class BPLScaleModule(
+  reactContext: ReactApplicationContext
+) : NativeBPLScaleSpec(reactContext), TurboModule {
+
+  override fun hello(name: String): String {
+    return "Hello $name from Kotlin TurboModule"
+  }
+
+  companion object {
+    const val NAME = "BPLScale"
+  }
+}

react-native-bpl-scale/android/src/main/java/com/bplscale/BPLScalePackage.kt

@@ -0,0 +1,30 @@
+package com.bplscale
+
+import com.facebook.react.bridge.*
+import com.facebook.react.turbomodule.core.TurboReactPackage
+
+class BPLScalePackage : TurboReactPackage() {
+
+  override fun getModule(
+    name: String,
+    context: ReactApplicationContext
+  ): NativeModule? {
+    return if (name == BPLScaleModule.NAME) {
+      BPLScaleModule(context)
+    } else null
+  }
+
+  override fun getReactModuleInfoProvider() =
+    ReactModuleInfoProvider {
+      mapOf(
+        BPLScaleModule.NAME to ReactModuleInfo(
+          BPLScaleModule.NAME,
+          BPLScaleModule.NAME,
+          false,
+          false,
+          true,
+          false
+        )
+      )
+    }
+}

react-native-bpl-scale/package.json

@@ -0,0 +1,21 @@
+{
+  "name": "react-native-bpl-scale",
+  "version": "1.0.0",
+  "main": "src/index.ts",
+"codegenConfig": {
+    "name": "BPLScale",
+    "type": "modules",
+    "jsSrcsDir": "src",
+    "android": {
+      "javaPackageName": "com.bplscale"
+    }
+  },
+  "peerDependencies": {
+    "react-native": ">=0.73"
+  },
+
+  "devDependencies": {
+    "react-native": "^0.73.0",
+    "typescript": "^5.0.0"
+  }
+}

react-native-bpl-scale/src/NativeBPLScale.ts

@@ -0,0 +1,8 @@
+import type { TurboModule } from 'react-native';
+import { TurboModuleRegistry } from 'react-native';
+
+export interface Spec extends TurboModule {
+  hello(name: string): string;
+}
+
+export default TurboModuleRegistry.getEnforcing<Spec>('BPLScale');

react-native-bpl-scale/src/index.ts

@@ -0,0 +1 @@
+export { default } from './NativeBPLScale';

react-native-bpl-scale/tsconfig.json

@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "target": "ES2019",
+    "module": "ESNext",
+    "lib": ["ES2019"],
+    "strict": true,
+    "skipLibCheck": true,
+    "moduleResolution": "node",
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "types": ["react-native"],
+    "baseUrl": "."
+  },
+  "include": ["src"]
+}

react-native.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+  name: 'react-native-bpl-scale',
+  version: '0.1.0',
+  dependencies: {},
+};

src/NativeBplScale.ts

@@ -1,7 +1,15 @@
-import { TurboModuleRegistry, type TurboModule } from 'react-native';
+import { NativeModules } from 'react-native';
 
-export interface Spec extends TurboModule {
+export interface NativeBplScale {
-  multiply(a: number, b: number): number;
+  startDiscovery(): void;
+  cancelDiscovery(): void;
+  getBondedDevices(): Promise<any[]>;
+  parseBluetoothScaleData(data: string): any;
+
+  // ✅ ADD THIS
+  scanDevices(scanDurationMs: number): Promise<any[]>;
 }
 
-export default TurboModuleRegistry.getEnforcing<Spec>('BplScale');
+const { BplScale } = NativeModules;
+
+export default BplScale as NativeBplScale;

src/index.tsx

@@ -1,5 +1,37 @@
-import BplScale from './NativeBplScale';
+import { NativeModules, Platform } from 'react-native';
 
-export function multiply(a: number, b: number): number {
+export type BLEDevice = {
-  return BplScale.multiply(a, b);
+  name: string;
-}
+  address: string;
+  weight: number;
+  impedance: number;
+};
+
+type BplScaleModuleType = {
+  scanDevices(scanDurationMs: number): Promise<BLEDevice[]>;
+};
+
+const { BplScale } = NativeModules as { BplScale: BplScaleModuleType };
+
+/**
+ * Scan BLE devices and return weight and impedance.
+ * @param scanDurationMs Duration of scan in milliseconds
+ * @returns Promise resolving to a list of BLE devices with weight & impedance
+ */
+export const scanDevices = async (scanDurationMs: number): Promise<BLEDevice[]> => {
+  if (Platform.OS !== 'android') {
+    throw new Error('BplScale module is only supported on Android.');
+  }
+
+  try {
+    const devices = await BplScale.scanDevices(scanDurationMs);
+    return devices;
+  } catch (error) {
+    console.error('BLE Scan Error:', error);
+    throw error;
+  }
+};
+
+export default {
+  scanDevices,
+};