I soldered first on the tiny pads, tested and had no connection. Ser2Net is running thanks to Lutz explenations.
Thought i did solder wrong, resoldered, damaged the Pads and moved Wire to the new spots.
Tested again with no luck.
For me this is not to bad, i use it as Accesspoint at home and already bought the tplink 3020.
Where the serial port is better to reach.