Transmit and receive as beacon at the same time

I need help with Beacons on Android, if anyone can help me. I need to find nearby devices that are using my App and need to read, know their Major and Minor. I've been browsing the altbeacon.org library but for all I understand this lib reads data from Beacons, the little beacons in stores for example, how I configure my App to broadcast as a beacon and at the same time read the other android devices running my app next to your data?