fix: gatt connect transport bug

app/src/main/java/icu/fur93/esp32_car/repository/BluetoothRepository.kt

@@ -3,6 +3,7 @@ package icu.fur93.esp32_car.repository
 import android.annotation.SuppressLint
 import android.bluetooth.BluetoothAdapter
 import android.bluetooth.BluetoothDevice
+import android.bluetooth.BluetoothDevice.TRANSPORT_LE
 import android.bluetooth.BluetoothGatt
 import android.bluetooth.BluetoothGattCallback
 import android.bluetooth.BluetoothGattCharacteristic
@@ -12,6 +13,7 @@ import android.bluetooth.le.ScanCallback
 import android.bluetooth.le.ScanResult
 import android.bluetooth.le.ScanSettings
 import android.content.Context
+import android.widget.Toast
 import icu.fur93.esp32_car.entity.BleDevice
 import icu.fur93.esp32_car.viewmodel.CarCommands
 import icu.fur93.esp32_car.viewmodel.CarState
@@ -26,6 +28,7 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
+import java.util.UUID
 
 // 蓝牙通信接口
 interface BluetoothRepository {
@@ -43,6 +46,10 @@ enum class ConnectionState {
     DISCONNECTING
 }
 
+val serviceUUID = "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"
+val rxCharUUID = "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
+val txCharUUID = "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"
+
 // 蓝牙通信实现
 class BluetoothRepositoryImpl(
     private val context: Context,
@@ -121,7 +128,6 @@ class BluetoothRepositoryImpl(
     @SuppressLint("MissingPermission")
     fun connectToDevice(device: BluetoothDevice) {
         _connectionState.value = ConnectionState.CONNECTING
-        
         device.connectGatt(
             context,
             false,
@@ -131,6 +137,12 @@ class BluetoothRepositoryImpl(
                     status: Int,
                     newState: Int
                 ) {
+                    if (status != BluetoothGatt.GATT_SUCCESS) {
+                        scope.launch(Dispatchers.Main) {
+                            Toast.makeText(context, "连接失败，错误码: $status", Toast.LENGTH_SHORT).show()
+                        }
+                        return
+                    }
                     when (newState) {
                         BluetoothProfile.STATE_CONNECTED -> {
                             bluetoothGatt = gatt
@@ -159,7 +171,7 @@ class BluetoothRepositoryImpl(
                         gatt.services?.forEach { service ->
                             service.characteristics?.forEach { characteristic ->
                                 // 这里需要根据你的设备具体的UUID来匹配
-                                if (characteristic.uuid.toString() == "YOUR_CHARACTERISTIC_UUID") {
+                                if (characteristic.uuid == UUID.fromString(rxCharUUID)) {
                                     rxCharacteristic = characteristic
                                 }
                             }
@@ -172,9 +184,12 @@ class BluetoothRepositoryImpl(
                     characteristic: BluetoothGattCharacteristic,
                     value: ByteArray
                 ) {
-                    onReceivePacket(value)
+                    if (characteristic.uuid == UUID.fromString(txCharUUID)) {
+                        onReceivePacket(value)
+                    }
                 }
-            }
+            },
+            TRANSPORT_LE
         )
     }
 
@@ -209,6 +224,8 @@ class BluetoothRepositoryImpl(
         if (!isValidPacket(packet)) return
 
         when (packet[2].toUByte().toUInt()) {
+
+            // `01 0C E0 电机A_IN_1_2 电机A_PWM 电机B_IN_1_2 电机B_PWM 电机C_IN_1_2 电机C_PWM 电机D_IN_1_2 电机D_PWM FE`
             CarCommands.CMD_STATUS_MOTOR -> updateMotorStatus(packet)
         }
     }