Building a wifi remote control

[From Hell]

Hi every one,

I'm building an esp8266 remote control to pilot my moode player.
It's an easy projet, just check buttons and rotaty encoder to send orders trougn Http commands .

i'v found the classic command like this one :

       http://moode/command/?cmd=play

i'v found PLAY, STOP, PAUSE/RESUME, NEXT and VOL n .
And also get Json of playing song.

Is there any other commands ? like PREV and maybe a power managment acces ? (http://moode/command/?cmd=shutdown) 

Thanks in advance for your answers

Greetings from Belgium
Fabian