Castalia is a simulator for  Body Area Networks (BAN) and generally networks of low-power embedded devices. It is based on the OMNeT++ platform to test distributed protocols in realistic wireless channel and radio models, with a realistic node behaviour especially relating to access of the radio.  

There are many resources are avialble to learn this simulator. Please send details, which type of protocol (MAC,Network)  you want to test in Castaila. 

What exactly you wanted to do with castalia? 

Thanks all of you for replying me. I want to implement my own routing protocol for WBAN scenario in castalia but there is no any routing protocol implementation found for WBAN. If any one implemented the routing protocol specially for BAN so please share it with me so I can have an idea how to implement my own protocol. 

Read the attached report, The attached report provides a throughout description of the

mechanisms and structure of Castalia-based implementation.

Thanks Muneer Bani