Send data to all participants registered as receivers, using the current timeStamp,
dynamic sequence number and the current payload type specified for the session.
Send data to all participants registered as receivers, using the specified timeStamp,
sequence number and the current payload type specified for the session.
Send RTCP App packet to receiver specified by ssrc
Return values:
0 okay
-1 no RTCP session established
-2 name is not byte[4];
-3 data is not byte[x], where x = 4*y for syme y
-4 type is not a 5 bit unsigned integer
Note that a return value of 0 does not guarantee delivery.