The 'ZMQ_RCVMORE' option shall return a boolean value indicating if the multi-part message currently being
read from the specified 'socket' has more message parts to follow.
The 'ZMQ_MCAST_LOOP' option shall control whether data sent via multicast transports using the specified
'socket' can also be received by the sending host via loopback.
The 'ZMQ_RATE' option shall set the maximum send or receive data rate for multicast transports such as in the
man page of zmq_pgm[7] using the specified 'socket'.
ZContext provides a high-level ZeroMQ context management class
The ZContext class wraps java org.zeromq.Context objects, which in turn wrap native 0MQ contexts.