RE: BLE Custom Services - nRF52840 - SDK15.3

Simon — Tue, 14 Apr 2020 22:18:27 GMT

If you want to send (notify) data from the server ( often a peripheral) to the client (often a central), you use the call sd_ble_gatts_hvx(). Take a look at the example \examples\ble_peripheral\ble_app_blinky and the function ble_lbs_on_button_change() in \nRF5_SDK_15.3\components\ble\ble_services\ble_lbs\ble_lbs.c for guidance how to use this. In your case, the server is the nRF52840 device and the client is the phone (Bluetooth terminal)

In order to receive the data (written from client to server), you have to create a BLE observer function through NRF_SDH_BLE_OBSERVER() and then look for the event BLE_GATTS_EVT_WRITE in the observer function. Take a look at the file \components\ble\ble_services\ble_lbs\ble_lbs.h, where ble_lbs_on_ble_evt() is added as a BLE observer, and at the file \components\ble\ble_services\ble_lbs\ble_lbs.c, where the function ble_lbs_on_ble_evt() is implemented. The received data is located in &p_ble_evt->evt.gatts_evt.params.write->data[0].

Best regards,

Simon