Using the ser2net extension with piCorePlayer
So I achieved success with building my extension and it is working like a charm.
I will give a little walkthrough for people who want to build and use the ser2net extension with piCore (and specially with with piCorePlayer in order to control old DENON AVR)
What was usedHardware Raspberry Pi 2 DENON AVR USB to serial adapter Software piCorePlayer 8.1.0—see piCorePlayer Downloads StepsStep 1 - Assemble hardware Plug in your USB to serial adapter.