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MODBUS_SET_SOCKET(3) | libmodbus Manual | MODBUS_SET_SOCKET(3) |
NAME¶
modbus_set_socket - set socket of the contextSYNOPSIS¶
int modbus_set_socket(modbus_t *ctx, int s);DESCRIPTION¶
The modbus_set_socket() function shall set the socket or file descriptor in the libmodbus context. This function is useful for managing multiple 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", 1502); 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(3)AUTHORS¶
The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>02/28/2020 | libmodbus v3.1.6 |