modbus_tcp_pi_listen - Man Page

create and listen a TCP PI Modbus socket (IPv6)

Synopsis

int modbus_tcp_pi_listen(modbus_t *ctx, int nb_connection);

Description

The modbus_tcp_pi_listen() function shall create a socket and listen to maximum nb_connection incoming connections on the specified nodes. The context ctx must be allocated and initialized with modbus_new_tcp_pi(3) before to set the node to listen, if node is set to NULL or 0.0.0.0, any addresses will be listen.

Return Value

The function shall return a new socket if successful. Otherwise it shall return -1 and set errno.

Example

For detailed examples, see source files in tests directory:

...

ctx = modbus_new_tcp_pi("::0", "502");
s = modbus_tcp_pi_listen(ctx, 1);
modbus_tcp_pi_accept(ctx, &s);

for (;;) {
    rc = modbus_receive(ctx, query);
    modbus_replay(ctx, query, rc, mb_mapping);
}
...

mclose(s);
modbus_free(ctx);

See Also

modbus_new_tcp_pi(3) modbus_tcp_pi_accept(3) modbus_tcp_listen(3)

Authors

The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>

Referenced By

libmodbus(7), modbus_new_tcp_pi(3), modbus_tcp_accept(3), modbus_tcp_listen(3), modbus_tcp_pi_accept(3).

10/18/2021 libmodbus v3.1.6 libmodbus Manual