问题描述
我正在尝试使用Flutter_blue库打开与设备的Bluetooth LE连接。 一切正常，除了方法connect总是会超时。
final device = await startScanAndListenForDevice();
print('norDIC -> Found device. Analysing ...');
print('norDIC -> Found JT Tag device. Relevant info:');
print('norDIC -> - id : ${device.id}');
print('norDIC -> - type : ${device.type}');
print('norDIC -> - name : ${device.name}');
print('norDIC -> Connecting ...');
// Check if device is already connected
try {
// Hangs here
await device.connect(autoConnect: true,timeout: const Duration(seconds: 30));
} on PlatformException catch (e) {
if (e.code != 'already_connected') {
print('norDIC -> Failed to connect: $e');
return null;
}
print('norDIC -> Already connected. Ignoring.');
} on Exception catch (e) {
print('norDIC -> Failed to connect: $e');
return null;
}
// Code to run after connection
...
以下是输出：
I/Flutter (30273): norDIC -> Found device 38:9A:F6:25:BC:DC/galaxy J5 Prime
I/Flutter (30273): norDIC -> Bluetooth scan cleared
I/Flutter (30273): norDIC -> Closing stream
I/Flutter (30273): norDIC -> Found device. Analysing ...
I/Flutter (30273): norDIC -> Found JT Tag device. Relevant info:
I/Flutter (30273): norDIC -> - id : 38:9A:F6:25:BC:DC
I/Flutter (30273): norDIC -> - type : BluetoothDeviceType.classic
I/Flutter (30273): norDIC -> - name : galaxy J5 Prime
I/Flutter (30273): norDIC -> Connecting ...
D/BluetoothManager(30273): getConnectedDevices
D/BluetoothGatt(30273): connect() - device: 38:9A:F6:25:BC:DC,auto: true
D/BluetoothGatt(30273): registerapp()
D/BluetoothGatt(30273): registerapp() - UUID=d490238f-6fd1-4d5b-805b-6ad0ff46a260
D/BluetoothGatt(30273): onClientRegistered() - status=0 clientIf=7
D/BluetoothAdapter(30273): isLeEnabled(): ON
D/BluetoothLeScanner(30273): Could not find callback wrapper
D/BluetoothManager(30273): getConnectionState()
D/BluetoothManager(30273): getConnectedDevices
... timeout ...
OBS：我使用带Bluetooth LE，笔记本电脑和其他智能手机的真实设备进行了测试，错误始终是相同的。尝试连接到其他智能手机（Android）时生成了此日志。另外，该设备正在运行，我使用某些第三方蓝牙工具对其进行了测试，并且能够接收一些数据。
解决方法
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