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I finally broke some of the code. Following information is very interesting:

Playing a URL on the Speakers and Older (non SoundPlus) Soundbars. This is used in playTrackAndResume, playTrackAndRestore, and playTrack in the SmartThings. It is a NEW command to the lexicon.

/UIC?cmd=onSetUrlPlayback

Variables: ${urlTrack} is a text string, no quotes. Example: http://s3.amazonaws.com/smartapp-media/sonos/dogs.mp3
${resume} is 0 or 1 (with quotes). 0 is do not resume. 1 is resume playing.

Playing a URL on the SoundPlus (newer) Soundbars: Use the port 9797 DMR / AVTransport UPnP commands.

Software versions:

There are two software versions for the Speakers and Soundbars. They are different

Speakers and non-SoundPlus Soundbars: Current version 3117.1 / 181R
a. Does not have the UPnP DMR capability (which includes AVTransport).
b. Uses “SetUrlPlayback” for URL play.

SoundPlus (Sound+) Soundbars (i.e., HS-MS650): Current version 1146.4 / 196R
a. Supports the UPnP DMR capability (which includes AVTransport).
b. Does not have the SetUrlPlayback command.

I have soundbar Samsung HW-Q900a and having an issue to get a input response when Airplay / Wi-Fi.

When I switch to Spotify i.e. AirPlay Wi-Fi and excute the command, there is no reponse at all

$ curl 'http://192.168.1.112:56001/UIC?cmd=%3Cname%3EGetFunc%3C/name%3E'
^C
$

For instance HDMI1 or HDMI2 input, there is an instant response to command:

$ curl 'http://192.168.1.112:56001/UIC?cmd=%3Cname%3EGetFunc%3C/name%3E'
<?xml version="1.0" encoding="UTF-8"?><UIC><method>CurrentFunc</method><version>1.0</version><speakerip>192.168.1.112</speakerip><user_identifier></user_identifier><response result="ok"><function>hdmi1</function><submode></submode><connection>on</connection></response></UIC>pi@ebusd:~/zigbee2mqtt $
$

Firmware verions is HW-Q900AWWB-1009.2:

$ curl 'http://192.168.1.112:56001/UIC?cmd=%3Cname%3EGetSoftwareVersion%3C/name%3E'
<?xml version="1.0" encoding="UTF-8"?><UIC><method>SoftwareVersion</method><version>1.0</version><speakerip>192.168.1.112</speakerip><user_identifier></user_identifier><response result="ok"><version>HW-Q900AWWB-1009.2</version><displayversion>HW-Q900AWWB-1009.2</displayversion></response></UIC>
$

1.) Is there any other command to identify Airplay / Wi-Fi as input ?
2.) Is this related to soundbar version or firmware ?

Thanks