What is BLE_GAP_EVT_ADV_REPORT

Question

I am trying to build a basic communication system without GATT or GAP services.
I don't have any device that is advertising, but it seems that my device get a 
 
 BLE_GAP_EVT_ADV_REPORT 
 
 event all the time.
I simply run the Scan_Start() function from BLE_Central samples. It seems to catch packets all the time even without device advertising? 
 So I want to ask what the scan program got in 
 
 p_gap_evt->params.adv_report 
 
 . I mean literally what's inside

endnode · Accepted Answer

Assuming you run S132 V5 stack (Soft Device) on nRF52832 chip then you can see all the details of GAP layer functions like Advertising and Scanning here . If you wonder what is inside event data structure upon reception of BLE_GAP_EVT_ADV_REPORT event then again read the API description . Depending on scanning mode (active or passive) you will get indication in scan_rsp flag saying if data field contains Advertising Data or Scan Response data. These strings will be literally the same as transmitted by your GAP Broadcaster/Peripheral (if that is another nRF5x device with Nordic stack then it matches one of the strings you provide in sd_ble_gap_sdv_data_set function call ). 
 Believe or not most of things are documented on Infocenter, if you use different stack version just find particular API reference (but these basic GAP functions and events are mostly unchanged for several years).