ENUM: zmq_socket_type
    ZMQ_PAIR
    ZMQ_PUB
    ZMQ_SUB
    ZMQ_REQ
    ZMQ_REP
    ZMQ_XREQ
    ZMQ_XREP
    ZMQ_PULL
    ZMQ_PUSH
    ;

FUNCTION: void* zmq_socket ( void* context, zmq_socket_type type ) ;