LWiFi.begin();
    LWiFiUDP u;
    u.begin(1234);  // host UDP port on 1234
    u.beginPacket(IPAddress(127.0.0.1), 123);  // start sending UDP datagram to 127.0.0.1 port 123
    u.write(0);  // the content is a single byte of value 0
    u.endPacket();  // actually send the packet