Central S120 and Authenticate

Question

Hello, 
 I want to implement a proximity central. At the moment, I do not get a bonded connection from central to proximity peripheral (For peripheral i use the proximity application for evalutaion board). As described in documentation a bonded state is needed. Is there a central example in which a bonded state is established? Do i also need the bond manager in central device? 
 At the moment, I proceed as follows: 
 
 conn_mngr_start() 
 After receive CONN_MNGR_CONN_COMPLETE_IND event --> start sd_ble_gap_authenticate() 
 After receive BLE_GAP_EVT_SEC_PARAMS_REQUEST evnt --> start sd_ble_gap_sec_params_reply() 
 After receive BLE_GAP_EVT_AUTH_STATUS --> start ble_db_discovery_start 
 
 The function start ble_db_discovery_start returns error code 0x3001. 
 Is this procedure correct? Or what is the best practice here?

Ole Morten · Accepted Answer

Could it be that the proximity application is already bonded to some other Central? If so, it will advertise with a whitelist for 30 s upon start, in which period it will be impossible for any other than the already bonded Central to connect. 
 If this is the case, you can either delete bond information from the proximity device, or modify the code of it so that it doesn't use whitelisting. Deleting bond information can be done by holding button 1 when powering on the kit.