I think you use 'setsockopt' error

[ACK555]

if( (setsockopt(sockfd, SOL_SOCKET, opts.size(), (char *)&opt, sizeof(opt))) < 0 ) {
cerr << "Errore setsockopt" << endl;
return -1;
}
-------------------->>>>>
if( (setsockopt(sockfd, SOL_SOCKET, opts.at(i), (char *)&opt, sizeof(opt))) < 0 ) {
cerr << "Errore setsockopt" << endl;
return -1;
}

[wwd2018]

@kashimAstro

[kashimAstro]

@ACK555 @wwd2018 hi guys sorry for long delay, in this last year i am very busy with work.
if anyone can prepare a pull request i am happy to accept or i try to fix some things in the next few days.

Ciao e grazie!