Uh, that was a mean one.... updated today from 1.4.1 to 1.5 and MYSController did not work anymore.
After change client.write(serialBuffer); to server.write(serialBuffer); old behavior was back.

I work since a few years with french based LCJ Ultrasonic anemometers which works quite well.
Output is NMEA based and i access them with the TinyGPSplus library. But not as MySensor node, because the update rate is 2Hz.