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Man Pages
MODBUS_SET_SOCKET(3) libmodbus Manual MODBUS_SET_SOCKET(3)

modbus_set_socket - set socket of the context

int modbus_set_socket(modbus_t *ctx, int s );

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.

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

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); } }

modbus_get_socket(3)

The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>
12/20/2018 libmodbus v3.1.4

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