On Wednesday 27 July 2016 09:15:44 Arun Raghavan wrote: > On Tue, 26 Jul 2016, at 03:42 PM, Philippe Latulippe wrote: > > Hello! > > > > I would like to connect many Bluetooth sources (devices that emit > > audio over bluetooth) and listen to them simultaneously. I am using > > Pulseaudio 5.0 and BlueZ 5.23. > > > > I managed to connect a single device and listen to it using the > > loopback module. But when I try to connect a second device, it > > immediately disconnects. > > > > Using hcidump, I can see that it all goes wrong with this packet, sent > > by the device receiving audio: > > > > < ACL data: handle 62 flags 0x00 dlen 10 > > L2CAP(d): cid 0x0042 len 6 [psm 25] > > AVDTP(s): Discover rsp: transaction 0 nsp 0x00 > > ACP SEID 1 - Audio Source > > ACP SEID 2 - Audio Sink (InUse) > > > > Notice how the sink is marked as InUse. After seeing this, the source > > ends the Bluetooth connection. > > > > It would seem that a BlueZ sink can only be used by one device. Is > > Pulseaudio supposed to register multiple endpoints with BlueZ, one for > > each device? Or is this an issue with BlueZ? > > My understanding is that this is broadly a limitation of how most (but > not all) Bluetooth devices work. You can't send multiple A2DP streams > at the same time. > > Depending on how many streams you're sending, you might even end up > hitting bandwidth restrictions quite quickly -- just something to keep > in mind. You can perfectly create A2DP "server" on linux machine. That will accept both Audio Sink & Source... I have tested it more times (between linux and linux machines) and that work fine. -- Pali Rohár pali.rohar at gmail.com
