zmq_connect_peer - create outgoing connection from socket and return the connection routing id in

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

       The zmq_connect_peer() function connects a ZMQ_PEER socket to an endpoint and then returns the endpoint
       routing_id.

       The endpoint is a string consisting of a transport:// followed by an address. The transport specifies the
       underlying protocol to use. The address specifies the transport-specific address to connect to.

       The function is supported only on the ZMQ_PEER socket type and would return 0 with errno set to ENOTSUP
       otherwise.

       The zmq_connect_peer() support the following transports:

       tcp
           unicast transport using TCP, see zmq_tcp(7)

       ipc
           local inter-process communication transport, see zmq_ipc(7)

       inproc
           local in-process (inter-thread) communication transport, see zmq_inproc(7)

       ws
           unicast transport using WebSockets, see zmq_ws(7)

       wss
           unicast transport using WebSockets over TLS, see zmq_wss(7)

EINVAL
           The endpoint supplied is invalid.

       EPROTONOSUPPORT
           The requested transport protocol is not supported with ZMQ_PEER.

       ENOCOMPATPROTO
           The requested transport protocol is not compatible with the socket type.

       ETERM
           The 0MQ context associated with the specified socket was terminated.

       ENOTSOCK
           The provided socket was invalid.

       EMTHREAD
           No I/O thread is available to accomplish the task.

       ENOTSUP
           The socket is not of type ZMQ_PEER.

       EFAULT
           The ZMQ_IMMEDIATE option is set on the socket.

ConnectingapeersockettoaTCPtransportandsendingamessage.

           /* Create a ZMQ_SUB socket */
           void *socket = zmq_socket (context, ZMQ_PEER);
           assert (socket);
           /* Connect it to the host server001, port 5555 using a TCP transport */
           uint32_t routing_id = zmq_connect (socket, "tcp://server001:5555");
           assert (routing_id == 0);
           /* Sending a message to the peer  */
           zmq_msg_t msg;
           int rc = zmq_msg_init_data (&msg, "HELLO", 5, NULL, NULL);
           assert (rc == 0);
           rc = zmq_msg_set_routing_id (&msg, routing_id);
           assert (rc == 0);
           rc = zmq_msg_send (&msg, socket, 0);
           assert (rc == 5);
           rc = zmq_msg_close (&msg);
           assert (rc == 0);

       zmq_connect_peer - create outgoing connection from socket and return the connection routing id in
       thread-safe and atomic way.

       The zmq_connect_peer() function returns the peer routing_id if successful. Otherwise it returns 0 and
       sets errno to one of the values defined below.

zmq_connect(3) zmq_bind(3) zmq_socket(3) zmq(7)

uint32_tzmq_connect_peer(void*socket,constchar*endpoint);