Updated my loop function should anyone be interested. The udp.print can send numbers - here it sends the time in seconds since it was turned on - every second...
Now I know how to send the data - but how do I get it into SignalK or OpenCPN is the big question...
Code:
void loop()
{
delay(1000);
//Send broadcast on port 3000
// udp.broadcastTo("this is now working", 3000);
Serial.println("Sending packages.... ");
Serial.println(millis()/1000);
udp.print(millis()/1000);
}