FB_UDPPeer - Method JoinMulticastGroup
Functional Description
Joins a multicast group for receiving messages sent to that group address by sending an IGMP AddMembership message (Internet Group Management Protocol).
The BOOL return value is TRUE if the function was executed successfully. Evaluate the property Result, in case the return value is FALSE.
NOTE: In order to receive multicast messages, the Bind method must first be used with a null string for the input i_sLocalIp, or leave the input unconnected.
Also refer to the implementation examples.