Socket.ipv4Only

Misc. socket properties.

Each of these has a one-to-one correspondence with an option passed to $(ZMQREF zmq_msg_getsockopt()) and $(ZMQREF zmq_msg_setsockopt()). For example, identity corresponds to ZMQ_IDENTITY, receiveBufferSize corresponds to ZMQ_RCVBUF, etc.

Notes:

• sck.identity = "foobar";
  assert (sck.identity.asString() == "foobar");

  For convenience, the setter for the identity property accepts strings. To retrieve a string with the getter, use the asString function.
• The fd property is an int on POSIX and a SOCKET on Windows.
• The ZMQ_SUBSCRIBE and ZMQ_UNSUBSCRIBE options are treated differently from the others; see Socket.subscribe and Socket.unsubscribe