[英]BLE Device disconnect with Android device automatically. Android BLE
I'm using Android Nexus 7 to connect a device via Bluetooth Low Energy link. 我正在使用Android Nexus 7通过Bluetooth Low Energy链接连接设备。 I'm able to connect the device, and stay connected if I don't do any communication with the device.
如果我不与设备进行任何通信,我可以连接设备并保持连接。
However, if I enable the notification of one specific characteristic by clicking a button, then the device would disconnect with the tablet after a few seconds' data transmission. 但是,如果我通过单击按钮启用一个特定特征的通知,则设备将在数秒传输数据后与平板电脑断开连接。
Does anyone know what might be the problem? 有谁知道可能是什么问题? Thank you very much!
非常感谢你!
Here's my code: 这是我的代码:
public boolean setCharacteristicNotification(boolean enabled){
if (mBluetoothAdapter == null || mBluetoothGatt == null) {
Log.w(TAG, "BluetoothAdapter not initialized");
return false;
}
BluetoothGattService Service = mBluetoothGatt.getService(UUID_MY_SERVICE);
if (Service == null) {
Log.e(TAG, "service not found!");
return false;
}
BluetoothGattCharacteristic characteristic = Service.getCharacteristic(UUID_MY_CHARACTERISTIC);
final int charaProp = characteristic.getProperties();
if ((charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) {
mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
mBluetoothGatt.writeDescriptor(descriptor);
return true;
}
return false;
}
(Answered in a question edit. Converted to a community wiki answer. See What is the appropriate action when the answer to a question is added to the question itself? ) (在问题编辑中回答。转换为社区维基答案。请参阅问题答案添加到问题本身时,适当的操作是什么? )
The OP wrote: OP写道:
I solved this problem today.
我今天解决了这个问题。
Just change
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
只需更改
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
to
descriptor.setValue(BluetoothGattDescriptor.ENABLE_INDICATION_VALUE);
到
descriptor.setValue(BluetoothGattDescriptor.ENABLE_INDICATION_VALUE);
Follow Up:
跟进:
After I did some research and testing, I found that the automatically disconnection problem has something to do with the interference between Bluetooth and WIFI on Nexus 7. If I turned off the WIFI, then the disconnection problem of Bluetooth has gone.
在我做了一些研究和测试之后,我发现自动断线问题与Nexus 7上的蓝牙和WIFI之间的干扰有关。如果我关闭了WIFI,那么蓝牙的断开问题已经消失。 And this problem did not occur on Galaxy 3,4,5.
并且这个问题在Galaxy 3,4,5上没有发生。
Problem: I was having same problem on Tesco Hudl 2, if i transmit some data soon as Bluetooth is connected, it will disconnect. 问题:我在Tesco Hudl 2上遇到了同样的问题,如果我在连接蓝牙后立即传输一些数据,它将断开连接。
Solution: Wait for few seconds after connection, it seems to work okay. 解决方案:连接后等待几秒钟,似乎工作正常。
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