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modbus_set_socket()					   modbus_set_socket()

Name
       modbus_set_socket - set socket of the context

Synopsis
       int modbus_set_socket(modbus_t *ctx, int	s);

Description
       The  modbus_set_socket()	function shall set the socket or file descrip-
       tor in the libmodbus context. This function is useful for managing mul-
       tiple client connections	to the same server.

Return value
       The function shall return 0 if successful. Otherwise it shall return -1
       and set errno.

Example
       ctx = modbus_new_tcp("127.0.0.1", 502);
       server_socket = modbus_tcp_listen(ctx, NB_CONNECTION);

       FD_ZERO(&rdset);
       FD_SET(server_socket, &rdset);

       /* .... */

       if (FD_ISSET(master_socket, &rdset)) {
	   modbus_set_socket(ctx, master_socket);
	   rc =	modbus_receive(ctx, query);
	   if (rc != -1) {
	       modbus_reply(ctx, query,	rc, mb_mapping);
	   }
       }

See also
       • modbus_get_socket <modbus_get_socket.md>

							   modbus_set_socket()

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=modbus_set_socket&sektion=3&manpath=FreeBSD+Ports+15.0>

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