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Why is Bluetooth audio routing so limited in android?????.........
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Smokey:
What is the deal with bluetooth audio routing limitations in android? 

*Why do you need a hack to play music to a headset with only HSP or HFP profiles?  Is this just an artificial limitation so people are forced to buy more expensive A2DP devices? (yes I know HSP and HFP are only mono)
*Why can you only have one of the same type of audio device active at a time (can't play music on multiple bluetooth speakers at the same time)?
*Why can't you connect multiple bluetooth headsets to the same phone and route audio between them, intercom style?

Is there some technical reason for any of this?  It all seems silly basic.  Why not use the software model that makes a list of connected input and output devices and any input can send to any output like a PC?  Is there some fundamental limitation in bluetooth or android or both?  It sounds like bluetooth5 is picking up some of these issues, but that all sounds like basic stuff that would have been here from the beginning.

...thoughts??
artag:
Initially, it was a limit on bandwidth : you could only have one audio connection without using it all. That was quickly removed when the bandwidth was doubled, and it has since been increased further. I don't know what the current limits are but would have expected it to be more flexible too - even if only handling multiple sets of headphones.
Smokey:
Interesting.  It's hard to believe low bit rate mono phone call quality audio would saturate the bandwidth of anything. 
artag:
I think it was only 1MBit/s in the initial spec, quickly increased to 2MBit/s, and more recently to 4 ?
langwadt:

--- Quote from: artag on May 11, 2019, 10:07:52 pm ---I think it was only 1MBit/s in the initial spec, quickly increased to 2MBit/s, and more recently to 4 ?

--- End quote ---

1Mbit/s was brutto, maximum transfer rate was 721kbit/s, the synchronous mode for audio was much more limited
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