如何在Android BLE 發送數據 ESP32 ?

woff

上篇 Android BLE ESP32的onCharacteristicChanged沒有回撥及getDescriptor null

接著就是要寫入數據到 ESP32 了

1. public boolean send(byte[] data) {
   
2.     if (mBluetoothGatt == null || mBluetoothGattService == null) {
   
3.         Log.w(TAG, "BluetoothGatt not initialized");
   
4.         return false;
   
5.     }
   
6. 
   
7.     BluetoothGattCharacteristic characteristic =
   
8.             mBluetoothGattService.getCharacteristic(UUID_SEND);
   
9. 
   
10.     if (characteristic == null) {
    
11.         Log.w(TAG, "Send characteristic not found");
    
12.         return false;
    
13.     }
    
14. 
    
15.     characteristic.setValue(data);
    
16.     characteristic.setWriteType(BluetoothGattCharacteristic.WRITE_TYPE_NO_RESPONSE);
    
17.     return mBluetoothGatt.writeCharacteristic(characteristic);
    
18. }

複製代碼

這時必須給予BluetoothGattServicer及BluetoothGattCharacteristic的UUID
就可以了

這時就會遇到下篇的問題
如何在Android BLE 發送到 ESP32 超過20個字元的數據？
展示影片


參考文章
https://stackoverflow.com/questions/24135682/android-sending-data-20-bytes-by-ble

來源
http://www.netyea.com