添加蓝牙读写功能

lib/controllers/ble_service.dart

@@ -12,6 +12,14 @@ import '../models/dict_entity.dart';
 import '../models/user_model.dart';
 
 class BleService extends GetxService  {
+
+  // 添加一个 StreamController
+  final _readController = StreamController<List<int>>();
+  Stream<List<int>> get readStream => _readController.stream;
+
+  // 添加一个标志，用于控制读取循环是否应该继续
+  bool _shouldContinueReading = false;
+
   static BleService get to => Get.find();
 
   var isScanning = false.obs;
@@ -104,18 +112,87 @@ class BleService extends GetxService  {
     connection.listen((update) async {
       // 如果连接状态为 connected，则显示连接成功的提示
       if (update.connectionState == DeviceConnectionState.connected) {
+        // 发现服务和特性
+        final services = await ble.discoverServices(device.id);
+        for (final service in services) {
+          print('Discovered service ${service.serviceId}');
+          for (final characteristic in service.characteristics) {
+            print('Discovered characteristic ${characteristic.characteristicId} of service ${service.serviceId}');
+          }
+        }
+        // 设置最大传输单元
+        await ble.requestMtu(deviceId: device.id, mtu: 512);
         await Future.delayed(Duration(seconds: 1)); // 添加延迟
         deviceStatus.value = 'Connected'; // 更新设备的连接状态
         Get.snackbar('Connected', 'Connected to ${device.name}');
         // Navigator.of(context).pop();
+
         // 关闭对话框
         DialogUtils.dismissDialog();
       } else {
         deviceStatus.value = 'Disconnected'; // 更新设备的连接状态
       }
     });
+
+
+  }
+
+  // 读取数据
+  Future<List<int>> readData(Uuid serviceUuid, Uuid characteristicUuid) async {
+    if (selectedDevice.value == null) {
+      throw Exception('No device connected');
+    }
+    final characteristic = QualifiedCharacteristic(
+      deviceId: selectedDevice.value!.id,
+      serviceId: serviceUuid,
+      characteristicId: characteristicUuid,
+    );
+
+    final result = await ble.readCharacteristic(characteristic);
+
+    return result;
+  }
+
+// 写入数据
+  Future<void> writeData(Uuid serviceUuid, Uuid characteristicUuid, List<int> data) async {
+    if (selectedDevice.value == null) {
+      throw Exception('No device connected');
+    }
+
+    final characteristic = QualifiedCharacteristic(
+      deviceId: selectedDevice.value!.id,
+      serviceId: serviceUuid,
+      characteristicId: characteristicUuid,
+    );
+
+    await ble.writeCharacteristicWithResponse(characteristic, value: data);
+  }
+
+  // 启动循环读取数据
+  Future<void> startReading(Uuid serviceUuid,Uuid characteristicUuid) async {
+    _shouldContinueReading = true;
+
+    while (_shouldContinueReading) {
+      // 读取数据
+      final data = await readData(serviceUuid,characteristicUuid);
+      // 将数据添加到 Stream 中
+      _readController.add(data);
+      // 等待一段时间，然后再次读取数据
+      await Future.delayed(Duration(seconds: 1));
+    }
   }
 
+  // 停止循环读取数据
+  void stopReading() {
+    _shouldContinueReading = false;
+  }
+  @override
+  void onClose() {
+    _readController.close();
+    super.onClose();
+  }
+
+
   // 检查权限
   Future<bool> requestBlePermissions() async {
     var isLocationGranted = await Permission.locationWhenInUse.request();
@@ -135,4 +212,7 @@ class BleService extends GetxService  {
         isBleConnectGranted == PermissionStatus.granted &&
         isBleAdvertiseGranted == PermissionStatus.granted;
   }
+
+
+
 }