How the Service Discovery Works?

Question

Hi,
What will happen when we press the service discovery button in the master control panel? do we get any event like BLE_GAP_EVT_CONNECTED? I couldn't find any detail regarding this in the documents i have. Please provide me some information on this. I need to implement one logic, when i get service discovery request, which may consume 10 to 20 sec time. Is it possible? 
 Regards,
Balaji

Ole Morten · Accepted Answer

You don't get any events on a service discovery being done from a Central device, since there isn't anything you can do about it anyway. The GATT Table is entirely contained inside the softdevice's memory, and hence there shouldn't be any reason to notify the application about it. 
 You should therefore either trigger your action on the CONNECTED event, or on a write to a particular characteristic. Is there any specific reason this won't work for your use case?