First bluetooth connection proof-of-concept

modules/android/app/build.gradle

@@ -47,4 +47,6 @@ dependencies {
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
     implementation "androidx.navigation:navigation-fragment-ktx:2.4.2"
-    implementation "androidx.navigation:navigation-ui-ktx:2.4.2"}
+    implementation "androidx.navigation:navigation-ui-ktx:2.4.2"
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.0")
+}

modules/android/app/src/main/AndroidManifest.xml

@@ -1,7 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.ghoscht.heliox">
-
+    <uses-feature android:name="android.hardware.bluetooth" android:required="true" />
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"

modules/android/app/src/main/java/com/ghoscht/heliox/LightControlFragment.kt

@@ -8,6 +8,7 @@ import android.view.ViewGroup
 import androidx.databinding.DataBindingUtil
 import androidx.fragment.app.viewModels
 import com.ghoscht.heliox.databinding.FragmentLightControlBinding
+import kotlinx.coroutines.*
 
 /**
  * A simple [Fragment] subclass.
@@ -18,6 +19,11 @@ class LightControlFragment : Fragment() {
     private val viewModel: LightControlViewModel by viewModels()
     private lateinit var binding: FragmentLightControlBinding
 
+    override fun onCreate(savedInstanceState: Bundle?) {
+        viewModel.connect()
+        super.onCreate(savedInstanceState)
+    }
+
     override fun onCreateView(
         inflater: LayoutInflater, container: ViewGroup?,
         savedInstanceState: Bundle?

modules/android/app/src/main/java/com/ghoscht/heliox/LightControlViewModel.kt

@@ -1,27 +1,65 @@
 package com.ghoscht.heliox
 
+import android.bluetooth.BluetoothAdapter
+import android.bluetooth.BluetoothDevice
+import android.bluetooth.BluetoothSocket
+import android.content.Intent
+import android.util.Log
+import androidx.core.app.ActivityCompat.startActivityForResult
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+import java.io.BufferedWriter
+import java.io.IOException
+import java.util.*
 
 class LightControlViewModel : ViewModel() {
-    private val _status = MutableLiveData<String>("0,0,0,0")
+    private val _status = MutableLiveData<String>("Disconnected")
     public val status: LiveData<String>
         get() = _status
+    private lateinit var connectedDevice: BluetoothDevice
+    private lateinit var btSocket: BluetoothSocket
+    val bluetoothAdapter: BluetoothAdapter? = BluetoothAdapter.getDefaultAdapter()
+    var pairedDevices: Set<BluetoothDevice>? = null
 
-    public fun turnOn(){
-        _status.postValue("255,255,255,255")
-    }
-    public fun turnOff(){
-        _status.postValue("0,0,0,0")
-    }
-    public fun toggle(){
-        _status.postValue("420,0,0,0")
-    }
-    public fun inc(){
+    public fun connect() {
+        GlobalScope.launch {
+            pairedDevices = bluetoothAdapter?.bondedDevices
 
+            val pairedDevices: Set<BluetoothDevice>? = bluetoothAdapter?.bondedDevices
+            pairedDevices?.forEach { device ->
+                if (device.name == "Heliox") {
+                    connectedDevice = device
+                    btSocket =
+                        device.createInsecureRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"))
+                    btSocket.connect()
+                    while (true) {
+                        _status.postValue(btSocket.inputStream.bufferedReader().readLine())
+                    }
+                }
+            }
+        }
     }
+
+    public fun turnOn() {
+        btSocket.outputStream.write("on".toByteArray())
+    }
+
+    public fun turnOff() {
+        btSocket.outputStream.write("off".toByteArray())
+    }
+
+    public fun toggle() {
+        btSocket.outputStream.write("0t".toByteArray())
+    }
+
+    public fun inc() {
+        btSocket.outputStream.write("0i".toByteArray())
+    }
+
     public fun dec(){
-
+        btSocket.outputStream.write("0d".toByteArray())
     }
 }