NAME¶
modbus_tcp_listen - create and listen a TCP Modbus socket
SYNOPSIS¶
int modbus_tcp_listen(modbus_t *ctx, int
nb_connection );
DESCRIPTION¶
The
modbus_tcp_listen() function shall create a socket and listen for
nb_connection incoming connections.
RETURN VALUE¶
The
modbus_tcp_listen() function shall return a new socket if successful.
Otherwise it shall return -1 and set errno.
EXAMPLE¶
For a detailed example, see source file bandwith-server-many-up.c provided in
tests directory.
...
ctx = modbus_new_tcp("127.0.0.1", 502);
if (modbus_connect(ctx) == -1) {
fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));
modbus_free(ctx);
return -1;
}
/* Handle until 10 established connections */
server_socket = modbus_tcp_listen(ctx, 10);
/* Clear the reference set of socket */
FD_ZERO(&refset);
/* Add the server socket */
FD_SET(server_socket, &refset);
if (select(server_socket + 1, &refset, NULL, NULL, NULL) == -1) {
}
...
close(server_socket);
modbus_free(ctx);
SEE ALSO¶
modbus_tcp_accept(3)
modbus_tcp_pi_accept(3)
modbus_tcp_pi_listen(3)
AUTHORS¶
The libmodbus documentation was written by Stéphane Raimbault <
stephane.raimbault@gmail.com[1]>
NOTES¶
- 1.
- stephane.raimbault@gmail.com
mailto:stephane.raimbault@gmail.com
