following example definitely works with 2. Generation echoDot, but in java. I just need to grind the udp-Signal out to another esp in homeNet. Anyone interested in changing experience? Unfortunately im am not taff enough to parse the libraries...
https://github.com/kakopappa/arduino-esp8266-alexa-multiple-wemo-switch
... practicable, but probably not necessary to grind out the signal by a second esp over the serial port and from there to UDP...
... but easy, to take the serial signal directly to the PC by wire and proceed there...