static void scan_interface_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, void* userdata) {
AvahiSRecordBrowser *b = userdata;
static void scan_interface_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, void* userdata) {
AvahiSRecordBrowser *b = userdata;