Set the Environment Variable "MAC" for the MAC-Address of the PC that you want to wake up and the Variable "CODE" for the secret that you must enter over the site. You must click on the symbol buttons to generate the secret code. The ON button send the code to the server (app is listen on environment variable "PORT"). Your PC will start if the code was correct. The App writes the received code to the console.
I must set the the network of the container to the network of the host (DS716+ii) to get it to work.