Airplay - auto standby function did not work

VINSHINE AUDIO reported a client issue:

When MOTIVO is used as Airplay endpoint, it seems that the device is always engaged/connected, not in 'Idle' state, hence, it doesn't go into standby mode.

Auto-Standby function works for Volumio OS native playback, i.e. NAS, Spotify

Software department suggestion: When airplay playback stops or the sender device disconnects, the airplay plugin does not report to the state machine that the status is stop.

VINSHINE AUDIO test cases are as follows:

Settings (common for all test cases)

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• Auto-Standby 'On'
• Standby Timeout: 1minute

Test #1 - Volumio OS

• Use Volumio OS to play music from NAS, Spotify
• Pause the music
• Wait for >= 1minute
• Motivo goes into standby mode
• Repeat the test several times, it is repeatable and works

Test #2 - roon /MOTIVO Airplay /Pause/Stop

• MOTIVO as Airplay endpoint
• Stream music from roon to MOTIVO
• Pause/Stop the music
• MOTIVO does not go into Standby mode automatically
• Repeat the test several times, it is consistent, i.e. MOTIVO does not go into Standby mode

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Test #3 - roon /MOTIVO Airplay /Exit roon

• MOTIVO as Airplay endpoint
• Stream music from roon to MOTIVO
• Pause the music
• Exit roon (close the application)
• MOTIVO does not go into Standby mode automatically
• Repeat the test several times, it is consistent, i.e. MOTIVO does not go into Standby mode