LMS-CLI: telnet - "playlist index +1" does not work

Hi everyone,

I am new to Squeezebox and am happy to have set up my first LMS with
local Squeezelite on a RPi - with lots of help from your forum.

Intended application:
- run internet radio stations
- user interface (with reduced user interaction)
-- display lms "status_header.html" on MagicMirror
-- control playlist of preferred stations via Apple remote A1156
(play/pause, volume up/down, next/previous station)

Setup:
- RPi 3b+
$ cat /etc/debian_version
10.10
$ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
- LMS via mysqueezebox.com/download
Version: 8.1.1
Platform: Debian/Ubuntu Linux ARM
File: logitechmediaserver_8.1.1_arm.deb
- Squeezelite on same RPi via 
$ sudo apt install squeezelite
squeezelite is already the newest version (1.8-4.1+b1).
- LMS and Squeezelite startup on boot
- lirc to receive A1156 data and python script to send commands to LMS
via telnet; python code for completeness of documentation of the issue

Code:
--------------------
    
  import lirc
  import time
  import telnetlib
  
  sockid = lirc.init("monitor", config_filename="~/App/SqueezeBoxIRController/monitor.lircrc", blocking=False)
  telnetid = telnetlib.Telnet("localhost", 9090)
  playpause = True
  
  while True:
  codeIR = lirc.nextcode()
  if codeIR != []:
  if codeIR[0] == "KEY_DOWN":
  print "mixer volume -5"
  telnetid.write("mixer volume -5 \r");
  elif codeIR[0] == "KEY_LEFT":
  print "playlist index -1"
  telnetid.write("playlist index -1 \r")
  elif codeIR[0] == "KEY_RIGHT":
  print "playlist index +1"
  telnetid.write("playlist index %2B1 \r")
  elif codeIR[0] == "KEY_UP":
  print "mixer volume +5"
  telnetid.write("mixer volume +5 \r");
  elif codeIR[0] == "KEY_MENU":
  print "stop"
  telnetid.write("stop\r")
  playpause = False
  elif codeIR[0] == "KEY_PLAYPAUSE":
  if playpause==True:
  print "pause"
  telnetid.write("pause\r")
  playpause = False
  else:
  print "play"
  telnetid.write("play\r")
  playpause = True
  else:
  print codeIR
  
  time.sleep(0.05)
  
--------------------


Issue:
- all commands work fine except for "playlist index +1" (resp. "playlist
index %2B1") EVEN VIA COMMAND LINE (so no issue with the python part)
-- e.g. with 2 stations in the playlist, "playlist index -1" will toggle
correctly but "playlist index +1" will not do anything (well, playback
stops for a moment but the same station keeps on playing)

Code:
--------------------
    
  $ telnet localhost 9090
  Trying ::1...
  Trying 127.0.0.1...
  Connected to localhost.
  Escape character is '^]'.
  playlist index -1
  00%3A00%3A00%3A00%3A00%3A00 playlist index -1   
  playlist index +1
  00%3A00%3A00%3A00%3A00%3A00 playlist index %2B1   
  playlist index %2B1
  00%3A00%3A00%3A00%3A00%3A00 playlist index %2B1  
  
--------------------


Is there another lms-cli command to get the next track in the playlist
to play?

Thx in advance.

Keep save, Jens


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