modbus_tcp_pi_listen3

Usage

Overview

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.

Examples

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);