node playback.js play doesn't work

[kenny.chen]

Hi guys,
I am trying to control Volmio2(v2.041) using CLI. however, I’ve found the playback.js (in /volumio/app/plugins/system_controller/volumio_command_line_client/commands) seems not working for some commands. It just hung there by typing ‘node playback.js play’, while ‘node playback.js next’ works fine. According to the WebSockets-API-Reference, there are a couple of commands available for Basic Playback:

Play: play
Pause: pause
Stop: stop
Previous: previous
Next: next
Seek seek N (N is the time in seconds that the playback will keep)
Random setRandom(true|false)
repeat setRepeat(true|false)

the following commands I’ve tested are working:
pause
stop
next
prev (not previous)

I also try the volumio (link to volumio.sh), it is almost the same, even the ‘prev’ doesn’t work either!
Any idea?

[Jellby]

I think playback.js, and some documentation I can’t find now, uses “socket.emit(‘play’,’’)”, but in my experience what works is “socket.emit(‘play’)”, without the second empty argument.

[kenny.chen]

Thanks Jellby!

yes, it works fine with “socket.emit(‘play’)” or “socket.emit(‘play’, null)”, but it gets hung with “socket.emit(‘play’, ‘’)”.

The document https://volumio.github.io/docs/API/WebSocket_APIs.html describes:

Typically, every message we send or receive to Volumio’s Backend will have this structure:

io.emit(‘message’,‘data’);
Where message can be for example “play” and data can be the song number.

I am just wondering what the data format of the song number is. Is it the position of a song or something else?
I tried “socket.emit(‘play’, ‘3’)” or “socket.emit(‘play’, 3)”, but the same, it is freezing too…

Is it a bug there?

[kenny.chen]

it is the same in the version 2.129. Well, i may change my question to: How can I start playing a song in a specific position in the command line? For example, start playing with the third song.
Any recommendation is appreciated.