localhost:~> sudo hcidump avdtp
HCI sniffer - Bluetooth packet analyzer ver 5.49
device: hci0 snap_len: 1500 filter: 0x400
< AVDTP(s): Discover cmd: transaction 14 nsp 0x00
> AVDTP(s): Discover rsp: transaction 14 nsp 0x00
ACP SEID 1 - Audio Sink
ACP SEID 2 - Audio Sink
ACP SEID 3 - Audio Sink
< AVDTP(s): All Capabilities cmd: transaction 15 nsp 0x00
ACP SEID 1
> AVDTP(s): All Capabilities rsp: transaction 15 nsp 0x00
Media Transport
Media Codec - SBC
16kHz 32kHz 44.1kHz 48kHz
Mono DualChannel Stereo JointStereo
4 8 12 16 Blocks
4 8 Subbands
SNR Loudness
Bitpool Range 2-53
Content Protection
02 00
Delay Reporting
< AVDTP(s): All Capabilities cmd: transaction 0 nsp 0x00
ACP SEID 2
> AVDTP(s): All Capabilities rsp: transaction 0 nsp 0x00
Media Transport
Media Codec - MPEG-2,4 AAC
MPEG-2 AAC LC
44.1kHz 48kHz
1 2 Channels
0bps VBR
Content Protection
02 00
Delay Reporting
< AVDTP(s): All Capabilities cmd: transaction 1 nsp 0x00
ACP SEID 3
> AVDTP(s): All Capabilities rsp: transaction 1 nsp 0x00
Media Transport
Media Codec - non-A2DP (LDAC)
3C 07
Content Protection
02 00
Delay Reporting
< AVDTP(s): Set config cmd: transaction 2 nsp 0x00
ACP SEID 1 - INT SEID 1
Media Transport
Media Codec - SBC
44.1kHz
JointStereo
16 Blocks
8 Subbands
Loudness
Bitpool Range 2-53
> AVDTP(s): Set config rsp: transaction 2 nsp 0x00
> AVDTP(s): Delay Report cmd: transaction 0 nsp 0x00
ACP SEID 1 delay 240.0ms
< AVDTP(s): Open cmd: transaction 3 nsp 0x00
ACP SEID 1
< AVDTP(s): Delay Report rsp: transaction 0 nsp 0x00
> AVDTP(s): Open rsp: transaction 3 nsp 0x00
By comparison, here is info when connecting a Sony WH-H800 Wireless Headphones:
localhost:~> sudo hcidump avdtp
HCI sniffer - Bluetooth packet analyzer ver 5.49
device: hci0 snap_len: 1500 filter: 0x400
< AVDTP(s): Discover cmd: transaction 8 nsp 0x00
> AVDTP(s): Discover rsp: transaction 8 nsp 0x00
ACP SEID 1 - Audio Sink
ACP SEID 5 - Audio Sink
ACP SEID 6 - Audio Sink
ACP SEID 3 - Audio Sink
ACP SEID 2 - Audio Sink
< AVDTP(s): All Capabilities cmd: transaction 9 nsp 0x00
ACP SEID 1
> AVDTP(s): All Capabilities rsp: transaction 9 nsp 0x00
Media Transport
Media Codec - SBC
44.1kHz 48kHz
Mono DualChannel Stereo JointStereo
4 8 12 16 Blocks
4 8 Subbands
SNR Loudness
Bitpool Range 2-53
Content Protection
02 00
Delay Reporting
< AVDTP(s): All Capabilities cmd: transaction 10 nsp 0x00
ACP SEID 5
> AVDTP(s): All Capabilities rsp: transaction 10 nsp 0x00
Media Transport
Media Codec - non-A2DP (LDAC)
3C 07
Content Protection
02 00
Delay Reporting
< AVDTP(s): All Capabilities cmd: transaction 11 nsp 0x00
ACP SEID 6
> AVDTP(s): All Capabilities rsp: transaction 11 nsp 0x00
Media Transport
Media Codec - non-A2DP (Unknown)
32 00 00 00 00
Content Protection
02 00
Delay Reporting
< AVDTP(s): All Capabilities cmd: transaction 12 nsp 0x00
ACP SEID 3
> AVDTP(s): All Capabilities rsp: transaction 12 nsp 0x00
Media Transport
Media Codec - non-A2DP (aptX)
44.1kHz 48kHz
Stereo
Content Protection
02 00
Delay Reporting
< AVDTP(s): All Capabilities cmd: transaction 13 nsp 0x00
ACP SEID 2
> AVDTP(s): All Capabilities rsp: transaction 13 nsp 0x00
Media Transport
Media Codec - MPEG-2,4 AAC
MPEG-2 AAC LC MPEG-4 AAC LC
44.1kHz 48kHz
1 2 Channels
320000bps VBR
Content Protection
02 00
Delay Reporting
< AVDTP(s): Set config cmd: transaction 14 nsp 0x00
ACP SEID 1 - INT SEID 1
Media Transport
Media Codec - SBC
44.1kHz
JointStereo
16 Blocks
8 Subbands
Loudness
Bitpool Range 2-53
> AVDTP(s): Set config rsp: transaction 14 nsp 0x00
< AVDTP(s): Open cmd: transaction 15 nsp 0x00
ACP SEID 1
> AVDTP(s): Open rsp: transaction 15 nsp 0x00
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