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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