dagb wrote: 
> Thank you for checking in, Philippe.
> 
> 
> >   >   > 
  - Single network interface
  - no docker/vm - running straight
  - no SELinux
  - no firewall
  - all in the same subnet,
  - on the same wifi network
  - Wireshark reveals that the Sonos devices are broadcasting SSDP
  > packets to 255.255.255.255:1900
  - I can talk to both devices (Sonos) on port 1400.
  - There are no active network interfaces on my laptop but lo and
  > wlan0.
  > > > 
> 
> 
> mylaptop ~ $ ifconfig 
> lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
> inet 127.0.0.1  netmask 255.0.0.0
> inet6 ::1  prefixlen 128  scopeid 0x10<host>
> loop  txqueuelen 1000  (Local Loopback)
> RX packets 2250828  bytes 3618279852 (3.3 GiB)
> RX errors 0  dropped 0  overruns 0  frame 0
> TX packets 2250828  bytes 3618279852 (3.3 GiB)
> TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
> 
> wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
> inet 192.168.100.22  netmask 255.255.255.0  broadcast
> 192.168.100.255
> ether xx:yy:zz:aa:bb:cc  txqueuelen 1000  (Ethernet)
> RX packets 44915013  bytes 37332713136 (34.7 GiB)
> RX errors 0  dropped 17  overruns 0  frame 0
> TX packets 25109437  bytes 15041952391 (14.0 GiB)
> TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
> 
> 
> mylaptop ~
> $/var/lib/logitechmediaserver/cache/InstalledPlugins/Plugins/UPnPBridge/Bin/squeeze2upnp-x86-64-static
> -i /tmp/sq2pnp.conf -f /tmp/sq2pnp.debug -d all=debug
> 
> results in:
> 
> [12:10:46.417544] main:1756 Starting squeeze2upnp version: v1.42.0
> (Nov 15 2020 @ 16:16:15)
> [12:10:46.417659] main:1764 
> 
> !!!!!!!!!!!!!!!!!! ERROR LOADING CONFIG FILE !!!!!!!!!!!!!!!!!!!!!
> 
> [12:10:46.419682] register_alac:550 using alac to decode alc
> [12:10:46.419724] register_mad:433 using mad to decode mp3
> [12:10:46.419738] register_faad:647 using faad to decode aac
> [12:10:46.419750] register_vorbis:346 using vorbis to decode ogg
> [12:10:46.419761] register_pcm:339 using pcm
> [12:10:46.419773] register_flac:313 using flac to decode flc
> [12:10:46.419784] register_opus:286 using opus to decode ops
> [12:10:46.419795] register_m4a_thru:307 using mp4 to aac (ADTS)
> [12:10:46.419806] register_flac_thru:247 using flac
> [12:10:46.419817] register_thru:106 using thru
> [12:10:46.419828] register_soxr:394 using soxr for resampling
> [12:10:46.419840] Start:1519 Binding to 192.168.100.22:49152
> [12:11:06.001377] UpdateThread:1092 Presence checking
> [12:11:06.201797] UpdateThread:1092 Presence checking
> [12:11:07.821851] Stop:1541 stopping squeezelite devices ...
> [12:11:07.821997] Stop:1545 terminate update thread ...
> [12:11:07.822166] Stop:1550 terminate main thread ...
> [12:11:07.822336] Stop:1554 stopping UPnP devices ...
> [12:11:07.822378] Stop:1557 un-register libupnp callbacks ...
> [12:11:07.822399] Stop:1559 end libupnp ...
> 
> 
> ....and no config file is written to /tmp/sq2pnp.conf 
> 
> I find it highly likely that I am overlooking something immensely
> stupid and simple, but I normally figure out stupid and simple stuff
> by sleeping on it.
> 
> The debugfile does not explicitly state that it found players. Or that
> it did not. I assume 'UpdateThread:1092 Presence checking' hints at
> finding a player. (I have two.)

I have not completely resolved this, but getting closer. My wifi
hardware is Unifi-based. By enabling 'IGMP Snooping' for the network and
'Multicast Enhancement' for the wireless network, I am at least able to
get a config file and have the players appear in the LNMS drop-down
list. Managed to start the music.  Now it stopped again. And the players
are gone from the drop-down list. I suspect something related to the
wifi network. Got multiple APs. And switches.


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