zmq_msg_routing_id - return routing ID for message, if any

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0MQ 4.3.5                                          03/31/2024                              ZMQ_MSG_ROUTING_ID(3)

       The zmq_msg_routing_id() function returns the routing ID for the message, if any. The routing ID is set
       on all messages received from a ZMQ_SERVER socket. To send a message to a ZMQ_SERVER socket you must set
       the routing ID of a connected ZMQ_CLIENT peer. Routing IDs are transient.

ReceivingaclientmessageandroutingID.

           void *ctx = zmq_ctx_new ();
           assert (ctx);

           void *server = zmq_socket (ctx, ZMQ_SERVER);
           assert (server);
           int rc = zmq_bind (server, "tcp://127.0.0.1:8080");
           assert (rc == 0);

           zmq_msg_t message;
           rc = zmq_msg_init (&message);
           assert (rc == 0);

           //  Receive a message from socket
           rc = zmq_msg_recv (server, &message, 0);
           assert (rc != -1);
           uint32_t routing_id = zmq_msg_routing_id (&message);
           assert (routing_id);

       zmq_msg_routing_id - return routing ID for message, if any

       The zmq_msg_routing_id() function shall return zero if there is no routing ID, otherwise it shall return
       an unsigned 32-bit integer greater than zero.

zmq_msg_set_routing_id(3)

uint32_tzmq_msg_routing_id(zmq_msg_t*message);