[stable20] Improve setting initial audio and video status when the HPB is used#4375

Merged

danxuliu merged 9 commits intostable20from

backport/4181/stable20

Oct 19, 2020

Commits on Oct 15, 2020

Fix some signaling messages not handled with external signaling server

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Send initial state messages for connections also through signaling

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Extract function to send current media state

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Repeat initial state messages when the HPB is used

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Fix sending initial media state to participants without audio or video

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Remove unneeded code

danxuliu
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Remove unneeded condition

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Extract functions to stop checking audio and media state

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Stop checking for peer media if audio/video status is received

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