zmq_connect_peer - create outgoing connection from socket and return the connection routing id in thread-safe and atomic way.
uint32_t zmq_connect_peer (void '*socket', const char '*endpoint');
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:
unicast transport using TCP, see zmq_tcp
local inter-process communication transport, see zmq_ipc
local in-process (inter-thread) communication transport, see zmq_inproc
unicast transport using WebSockets, see zmq_ws
unicast transport using WebSockets over TLS, see zmq_wss
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.
The endpoint supplied is invalid.
The requested 'transport' protocol is not supported with 'ZMQ_PEER'.
The requested 'transport' protocol is not compatible with the socket type.
The 0MQ 'context' associated with the specified 'socket' was terminated.
The provided 'socket' was invalid.
No I/O thread is available to accomplish the task.
The socket is not of type 'ZMQ_PEER'.
The 'ZMQ_IMMEDIATE' option is set on the socket.
/* 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);
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