BluetoothGatt.writeCharacteristic()始终返回false. [英] BluetoothGatt.writeCharacteristic() always returns false.

问题描述

我正在编写一个Android应用程序，以使用BLE与Arduino对话.我已经能够扫描设备，连接到目标，发现服务，获取特征并读取可读的特征.但是，当我尝试编写可写特征时，该方法始终返回false.当我调试到android.bluetooth代码时，会发生以下顺序:Characteristics.getService().getDevice始终返回null，这会导致writeCharacteristic失败.

I am writing an Android app to talk with an Arduino using BLE. I have been able to scan devices, connect to the target, discover services, get characteristics, and read those that are readable. However, when I try to write a writeable characteristics, the method always returns false. When I debugged into the android.bluetooth code, the following sequence occurs: characteristic.getService().getDevice always returns null, which causes the writeCharacteristic to fail.

任何帮助将不胜感激！

推荐答案

请按照相应的顺序检查对象.每次需要写入BLE设备时，我仅保留BluetoothGatt对象并创建BluetoothGattService和BluetoothGattCharacteristic.

Please check your objects in the corresponding sequence. I keep only the BluetoothGatt object and create BluetoothGattService and BluetoothGattCharacteristic every time I need to write to the BLE device.

byte[] data_to_write; // Your data
BluetoothManager mBluetoothManager = (BluetoothManager) context.getSystemService(Context.BLUETOOTH_SREVICE);
BluetoothAdapter mBluetoothAdapter = mBluetoothManager.getAdapter();
BluetoothDevice mDevice = mBluetoothAdapter.getRemoteDevice(....);
BluetoothGatt mBG = mDevice.connectGatt(....);

BluetoothGattService mSVC = mBG.getService(service_uuid);
BluetoothGattCharacteristic mCH = mSVC.getCharacteristic(characteristic_uuid);
mCH.setValue(data_to_write);
mBG.writeCharacteristic(mCH);

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