PCA10056/NRF52840 used android Blinky source code.

Question

If I want to send two byte, how can I do? I use the https://github.com/NordicSemiconductor/Android-nRF-Blinky sample code. 
 In BlinkyManage.jave 
 
 public void send(final boolean onOff) { // Are we connected? if (mLedCharacteristic == null) return; 
 final byte[] command = new byte[] {(byte) (onOff ? 1 : 0)}; log(LogContract.Log.Level.VERBOSE, "Turning LED " + (onOff ? "ON" : "OFF") + "..."); writeCharacteristic(mLedCharacteristic, command); } 
 Just only send one byte.

ovrebekk · Accepted Answer

Hi Ray 
 On the Android side, all you have to do is to initialize the command variable with two bytes instead of one: 
 // Set the command buffer to {0x01, 0x02} final byte[] command = new byte[]{(byte)0x01, (byte)0x02}; 
 Please note that the blinky service is only set up to send/receive one byte on each of the two characteristics. To change this you would have to modify the characteristic configuration in ble_lbs.c to increase the max length to more than 1 byte (excerpt from line 119): 
 attr_char_value.p_uuid = &ble_uuid; attr_char_value.p_attr_md = &attr_md; attr_char_value.init_len = sizeof(uint8_t) ; attr_char_value.init_offs = 0; attr_char_value.max_len = sizeof(uint8_t) ; attr_char_value.p_value = NULL; 
 If you do this I would recommend making a copy of the ble_lbs.c and ble_lbs.h files, and change the LBS_UUID_BASE define to avoid mixing your service up with the original blinky service. 
 Best regards Torbjørn

PCA10056/NRF52840 used android Blinky source code.

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