// rather than using this generic listen() call.
snprintf( bind_info, sizeof( bind_info ), "%s://%s:%s", proto, interface, port );
if( (state = nng_listen( ctx->nn_sock, bind_info, NULL, NO_FLAGS )) != 0 ) {
// rather than using this generic listen() call.
snprintf( bind_info, sizeof( bind_info ), "%s://%s:%s", proto, interface, port );
if( (state = nng_listen( ctx->nn_sock, bind_info, NULL, NO_FLAGS )) != 0 ) {