I know I can send a packet with data length 1~20 using sd_ble_gatts_hvx(), then how to send an empty notification packet(data length 0)?

[irarykim]

Hi, I am using nrf51822 (128k). Softdevice 6.0 (s110), SDK 5.2. How can I send an empty notification packet (data length 0) to master device? If I send a packet with data length 0, nrf51822 reset...

Thank you.

[Pål Håland]

Hi

If you would like to send an empty notification, the hvx_params have to be something like this:

unit8_t buffer[20], len=0;

hvx_params.p_data = &buffer[0];
hvx_params.p_len = &len;
hvx_params.offset = 0;
hvx_params.type = BLE_GATT_HVX_NOTIFICATION;
hvx_params.handle = 0x000F

sd_ble_gatts_hvx(gs_conn_handle, &hvx_params);

[irarykim]

Thank you very much! It is strange, I tried in this way two days ago, but my nrf51822 resets when send zero-length-data packet. But not works without reset~

I will test more.

[Petter Myhre]

Please thank him by accepting his answer, and please remember to vote: devzone.nordicsemi.com/.../ .

[irarykim]

I hope the [accept] button would be bigger so that I can easilly find where it is~