feat: discover services

app/src/main/java/com/example/sensortestingapp/MainActivity.kt

@@ -50,6 +50,25 @@ fun Context.hasRequiredRuntimePermissions(): Boolean {
     }
 }
 
+private fun BluetoothGatt.printGattTable() {
+    if (services.isEmpty()) {
+        Log.i(
+            "printGattTable",
+            "No service and characteristic available, call discoverServices() first?"
+        )
+        return
+    }
+    services.forEach { service ->
+        val characteristicsTable = service.characteristics.joinToString(
+            separator = "\n|--",
+            prefix = "|--"
+        ) { it.uuid.toString() }
+        Log.i(
+            "printGattTable", "\nService ${service.uuid}\nCharacteristics:\n$characteristicsTable"
+        )
+    }
+}
+
 @SuppressLint("MissingPermission")
 class MainActivity : AppCompatActivity() {
 
@@ -89,6 +108,13 @@ class MainActivity : AppCompatActivity() {
                         "BluetoothGattCallback",
                         "Successfully connected to $deviceAddress (${deviceName})"
                     )
+                    val serviceDiscoveryStarted = gatt.discoverServices()
+                    if (!serviceDiscoveryStarted) {
+                        Log.e(
+                            "BluetoothGattCallback",
+                            "Service discovery did not start"
+                        )
+                    }
                     // TODO: Store a reference to BluetoothGatt
                 } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                     Log.w(
@@ -105,6 +131,16 @@ class MainActivity : AppCompatActivity() {
                 gatt.close()
             }
         }
+
+        override fun onServicesDiscovered(gatt: BluetoothGatt, status: Int) {
+            with(gatt) {
+                Log.i(
+                    "BluetoothGattCallback",
+                    "Discovered ${services.size} services for ${device.address} (${device.name})"
+                )
+                printGattTable()
+            }
+        }
     }
 
     private val scanResultAdapter: ScanResultAdapter by lazy {