for example, ATT Command - Read By Group Type Request
0000: 02 47 00 0b 00 07 00 04 00 10 01 00 ff ff 00 28
0x02 is HCI ACL Data Packet (Table 2.1 HCI Packet Indicator)
0x47 is Handle
0x00 means PB Flag and BC Flag is 0
0x000b is Data Total Length
then follows the L2CAP packet
0x0004 is CID (Attribute Protocol PDU)
and then Attribute Protocol PDU
primary [UUID] Primary Service Discover
the UUID means "Discover Primary Services By Service UUID"
If left UUID blank:
Read by Group Type Request
< ACL Data TX: Handle 71 flags 0x00 dlen 11
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x0001-0xffff
Attribute group type: Primary Service (0x2800)
0000: 02 47 00 0b 00 07 00 04 00 10 01 00 ff ff 00 28
Number of Completed Packets Event
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 22:57:39.703757
Num handles: 1
Handle: 71
Count: 1
> 0000: 04 13 05 01 47 00 01 00
Read by Group Type Response
> ACL Data RX: Handle 71 flags 0x02 dlen 24
ATT: Read By Group Type Response (0x11) len 19
Attribute data length: 6
Attribute group list: 3 entries
Handle range: 0x0001-0x000b
UUID: Generic Access Profile (0x1800)
Handle range: 0x000c-0x000f
UUID: Generic Attribute Profile (0x1801)
Handle range: 0x0010-0x0022
UUID: Device Information (0x180a)
> 0000: 02 47 20 18 00 14 00 04 00 11 06 01 00 0b 00 00 0010: 18 0c 00 0f 00 01 18 10 00 22 00 0a 18
It looks like that one response delivers a group a time, so successive request/response continues until handle reaches 0xffff
< ACL Data TX: Handle 71 flags 0x00 dlen 11 [hci0] 22:57:39.844179
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x0023-0xffff
Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 22:57:39.913884
Num handles: 1
Handle: 71
Count: 1
> ACL Data RX: Handle 71 flags 0x02 dlen 26 [hci0] 22:57:39.983445
ATT: Read By Group Type Response (0x11) len 21
Attribute data length: 20
Attribute group list: 1 entry
Handle range: 0x0023-0x002d
UUID: Unknown (f000aa00-0451-4000-b000-000000000000)
< ACL Data TX: Handle 71 flags 0x00 dlen 11 [hci0] 22:57:39.983995
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x002e-0xffff
Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 22:57:40.060765
Num handles: 1
Handle: 71
Count: 1
> ACL Data RX: Handle 71 flags 0x02 dlen 26 [hci0] 22:57:40.123327
ATT: Read By Group Type Response (0x11) len 21
Attribute data length: 20
Attribute group list: 1 entry
Handle range: 0x002e-0x0038
UUID: Unknown (f000aa10-0451-4000-b000-000000000000)
< ACL Data TX: Handle 71 flags 0x00 dlen 11 [hci0] 22:57:40.123544
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x0039-0xffff
Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 22:57:40.193685
Num handles: 1
Handle: 71
Count: 1
> ACL Data RX: Handle 71 flags 0x02 dlen 26 [hci0] 22:57:40.263413
ATT: Read By Group Type Response (0x11) len 21
Attribute data length: 20
Attribute group list: 1 entry
Handle range: 0x0039-0x0043
UUID: Unknown (f000aa20-0451-4000-b000-000000000000)
< ACL Data TX: Handle 71 flags 0x00 dlen 11 [hci0] 22:57:40.263720
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x0044-0xffff
Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 22:57:40.403808
Num handles: 1
Handle: 71
Count: 1
> ACL Data RX: Handle 71 flags 0x02 dlen 26 [hci0] 22:57:40.404839
ATT: Read By Group Type Response (0x11) len 21
Attribute data length: 20
Attribute group list: 1 entry
Handle range: 0x0044-0x004e
UUID: Unknown (f000aa30-0451-4000-b000-000000000000)
< ACL Data TX: Handle 71 flags 0x00 dlen 11 [hci0] 22:57:40.405062
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x004f-0xffff
Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 22:57:40.473655
Num handles: 1
Handle: 71
Count: 1
> ACL Data RX: Handle 71 flags 0x02 dlen 26 [hci0] 22:57:40.549909
ATT: Read By Group Type Response (0x11) len 21
Attribute data length: 20
Attribute group list: 1 entry
Handle range: 0x004f-0x005d
UUID: Unknown (f000aa40-0451-4000-b000-000000000000)
< ACL Data TX: Handle 71 flags 0x00 dlen 11 [hci0] 22:57:40.550199
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x005e-0xffff
Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 22:57:40.613695
Num handles: 1
Handle: 71
Count: 1
> ACL Data RX: Handle 71 flags 0x02 dlen 26 [hci0] 22:57:40.683447
ATT: Read By Group Type Response (0x11) len 21
Attribute data length: 20
Attribute group list: 1 entry
Handle range: 0x005e-0x0068
UUID: Unknown (f000aa50-0451-4000-b000-000000000000)
< ACL Data TX: Handle 71 flags 0x00 dlen 11 [hci0] 22:57:40.683942
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x0069-0xffff
Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 22:57:40.753660
Num handles: 1
Handle: 71
Count: 1
> ACL Data RX: Handle 71 flags 0x02 dlen 12 [hci0] 22:57:40.823257
ATT: Read By Group Type Response (0x11) len 7
Attribute data length: 6
Attribute group list: 1 entry
Handle range: 0x0069-0x006d
UUID: Unknown (0xffe0)
< ACL Data TX: Handle 71 flags 0x00 dlen 11 [hci0] 22:57:40.823554
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x006e-0xffff
Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 22:57:40.893657
Num handles: 1
Handle: 71
Count: 1
> ACL Data RX: Handle 71 flags 0x02 dlen 26 [hci0] 22:57:40.970015
ATT: Read By Group Type Response (0x11) len 21
Attribute data length: 20
Attribute group list: 1 entry
Handle range: 0x006e-0x0074
UUID: Unknown (f000aa60-0451-4000-b000-000000000000)
< ACL Data TX: Handle 71 flags 0x00 dlen 11 [hci0] 22:57:40.970332
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x0075-0xffff
Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 22:57:41.033661
Num handles: 1
Handle: 71
Count: 1
> ACL Data RX: Handle 71 flags 0x02 dlen 26 [hci0] 22:57:41.103462
ATT: Read By Group Type Response (0x11) len 21
Attribute data length: 20
Attribute group list: 1 entry
Handle range: 0x0075-0x007f
UUID: Unknown (f000ccc0-0451-4000-b000-000000000000)
< ACL Data TX: Handle 71 flags 0x00 dlen 11 [hci0] 22:57:41.103968
ATT: Read By Group Type Request (0x10) len 6
Handle range: 0x0080-0xffff
Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 22:57:41.173666
Num handles: 1
Handle: 71
Count: 1
> ACL Data RX: Handle 71 flags 0x02 dlen 26 [hci0] 22:57:41.243343
ATT: Read By Group Type Response (0x11) len 21
Attribute data length: 20
Attribute group list: 1 entry
Handle range: 0x0080-0xffff
UUID: Unknown (f000ffc0-0451-4000-b000-000000000000)
If UUID is used (0x1801 for example):
Find By Type Value Request
< ACL Data TX: Handle 71 flags 0x00 dlen 13 [hci0] 01:01:43.451403
ATT: Find By Type Value Request (0x06) len 8
Handle range: 0x0001-0xffff
Attribute type: Primary Service (0x2800)
UUID: Generic Attribute Profile (0x1801)
< 0000: 02 47 00 0d 00 09 00 04 00 06 01 00 ff ff 00 28
0010: 01 18
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 01:01:44.241679
Num handles: 1
Handle: 71
Count: 1
Find By Type Value Response
Note: The Group End Handle may be greater than the Ending Handle in the Find By Type Value Request.
> ACL Data RX: Handle 71 flags 0x02 dlen 9 [hci0] 01:01:44.311128
ATT: Find By Type Value Response (0x07) len 4
Handle range: 0x000c-0x000f
> 0000: 02 47 20 09 00 05 00 04 00 07 0c 00 0f 00
Then another Find By Type Value Request is sent with the rest of handle replied by the response above
< ACL Data TX: Handle 71 flags 0x00 dlen 13 [hci0] 01:01:44.311737
ATT: Find By Type Value Request (0x06) len 8
Handle range: 0x0010-0xffff
Attribute type: Primary Service (0x2800)
UUID: Generic Attribute Profile (0x1801)
> HCI Event: Number of Completed Packets (0x13) plen 5 [hci0] 01:01:44.381585
Num handles: 1
Handle: 71
Count: 1
Error Response
> ACL Data RX: Handle 71 flags 0x02 dlen 9 [hci0] 01:01:44.450990
ATT: Error Response (0x01) len 4
Find By Type Value Request (0x06)
Handle: 0x0010
Error: Attribute Not Found (0x0a)
> 0000: 02 47 20 09 00 05 00 04 00 01 06 10 00 0a
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