REQ-REP Hello World
file: bin/raw_req_rep_hello_world_client.pl 12: zmq_send($client,$text); 13: say "client sent >$text<"; 14: 15: my $reply = zmq_msg_data(zmq_recvmsg($client)); 16: say "client got >$reply<";
so we use zmq_send() to send the message.