modbus_tcp_pi_listen - create and listen a TCP PI Modbus socket (IPv6)
int modbus_tcp_pi_listen(modbus_t *ctx, int
nb_connection);
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.
The function shall return a new socket if successful. Otherwise it shall return
-1 and set errno.
For detailed examples, see source files in tests directory:
•unit-test-server.c, simple but handle only one
connection
...
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);
•bandwidth-server-many-up.c, handles several
connections at once
modbus_new_tcp_pi(3) modbus_tcp_pi_accept(3)
modbus_tcp_listen(3)
The libmodbus documentation was written by Stéphane Raimbault
<stephane.raimbault@gmail.com>