Esp32 Lyrat 4.3 user guide

[Freeck]

Hello there,
I received a Lyrat 4.3 board and started the module and played some mp3-files copied to the microSD-card, just as decribed in the standard user guide.
Via the usb-serial interface a set of commands are exposed to control the board (play, mute, next, adduri..).
Question: is there a specification or user guide available which describes these commands?

FYI: this is the startup banner:
----------------------------- ESP Audio Platform ----------------------------
Player_Version 0.9-rc1 |
| Compile date: Jun 14 2018-16:58:26 |
| Commit SHA1:d55cade052283bccb3023c34e07064fe27addb01 |
| ESP-IDF :v3.0-6-g462de45-dirty |
------------------------------------------------------------------------------
In case I do a Smartconfig via the smartconfig-App or set my Wifi-credentials via the usb-serial interface (wifiset "user" "password"),
after resetting the board, the old password is restored!
TERM_CTRL: Connected Wifi SSID:"steven"[0m , No idea who steven is!!??