You may check out the hello_client app for reference on how things are done, although it may not be applicable if you are developing an Android app. I will point out a few functions/callbacks here:
1) To enable a device to emulate a Client role:
blecm_ConMuxInit(HELLO_CLIENT_MAX_SLAVES); //this allows the central to connect up to 4 (default) peripherals
blecm_enableConMux();
blecm_enablescatternet();
blecen_Create(); //this creates the Central/Client role
2) To receive notification when controller receives advertisement from the peripheral
// register to process peripheral advertisements, notifications and indications
blecm_RegleAdvReportCb((BLECM_FUNC_WITH_PARAM) hello_client_advertisement_report);
// You may then go on to define what you want to do in the callback (hello_client_advertisement_report).
