https://devzone.nordicsemi.com/f/nordic-q-a/3529/question-of-nrf51822-ble-stack-api-firmwareThe nRF51822 BLE stack API source for the above question ... fp_handler = conn_mw_item [i] .fp_handler; For fp_handler function pointer, I want to get information about a function is executed internally .... And err_code = fp_handler (p_rx_bufen-USTelligent Community 13Wed, 20 Aug 2014 13:18:24 GMThttps://devzone.nordicsemi.com/thread/12774?ContentTypeID=1Wed, 20 Aug 2014 13:18:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2fb2648c-f13b-47ff-999f-1c40726a9375Sebastian<p>Please have a look at conn_mw_items.c - there you&#39;ll find table of pointers to functions. In same directory you&#39;ll find those functions implementation.</p> <p>The code you have shown is fragment of serialization module. Function pointed by fp_handler decodes request that came through serial port and is located in p_rx_buf then call required soft device function and finally encodes response in p_tx_buf.</p><div style="clear:both;"></div>