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ble_db_discovery_start doesn't complete with specific phone

My project uses nRF52840-DK to connect, bond and discover a custom service with two characteristics (TX and RX) and RX Characteristic has a CCCD (0x2902).

The flow of the software goes as follow:

1) the nRF connects to the phone

2) the nRF bonds to the phone

3) the nRF starts discovery of the service

4) the nRF reads/writes from/to the phone using the service

This works as expected with different phones I tried (Galaxy S6, S6 Edge and S7, android versions 7.0, 7.0 and 8.0). but when using Galaxy A31 android version 10.0 I can't complete discovery. I added a print to ble_db_discovery_on_ble_evt() and noticed that with the issued phone I don't get the events with BLE_GATTC_EVT_CHAR_DISC_RSP (50) and BLE_GATTC_EVT_DESC_DISC_RSP (51) which I do get with the working phones.

Furthermore, the issued phone gets a disconnect after some time with error BLE_HCI_CONNECTION_TIMEOUT, which I believe happens because the discovery prevents the nRF to maintain the connection (I saw that with out calling  ble_db_discovery_start the connection doesn't disconnect after a long time).

Does anyone have an idea why this happens?

Thanks in advance

Log of working phone:

<debug> ble_db_disc: Starting discovery of service with UUID 0x1101 on connection handle 0x0.
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Primary Services Discovery Request
<debug> nrf_ble_gq: Processing the request queue...
<debug> ble_db_disc: XXXX: ble_db_discovery_on_ble_evt 48
<debug> ble_db_disc: Found service UUID 0x1101.
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Characteristic Discovery Request
<debug> nrf_ble_gq: SD GATT procedure (3) succeeded on connection handle: 0.
<debug> nrf_ble_gq: Processing the request queue...
<debug> ble_db_disc: XXXX: ble_db_discovery_on_ble_evt 50
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Characteristic Discovery Request
<debug> nrf_ble_gq: SD GATT procedure (3) succeeded on connection handle: 0.
<debug> nrf_ble_gq: Processing the request queue...
<debug> ble_db_disc: XXXX: ble_db_discovery_on_ble_evt 50
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Characteristic Descriptor Request
<debug> nrf_ble_gq: SD GATT procedure (4) succeeded on connection handle: 0.
<debug> nrf_ble_gq: Processing the request queue...
<debug> ble_db_disc: XXXX: ble_db_discovery_on_ble_evt 51
<info> ble_db_disc: 0 cccd_handle 43
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Characteristic Descriptor Request
<debug> nrf_ble_gq: SD GATT procedure (4) succeeded on connection handle: 0.
<debug> nrf_ble_gq: Processing the request queue...
<debug> ble_db_disc: XXXX: ble_db_discovery_on_ble_evt 51
<debug> ble_db_disc: Discovery of service with UUID 0x1101 completed with success on connection handle 0x0.
<info> app: Discovery complete.

Log of issued phone:

<debug> ble_db_disc: Starting discovery of service with UUID 0x1101 on connection handle 0x0.
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Primary Services Discovery Request
<debug> nrf_ble_gq: Processing the request queue...
<debug> ble_db_disc: XXXX: ble_db_discovery_on_ble_evt 48
<debug> ble_db_disc: Found service UUID 0x1101.
<debug> nrf_ble_gq: Adding item to the request queue
<debug> nrf_ble_gq: GATTC Characteristic Discovery Request
<debug> nrf_ble_gq: SD GATT procedure (3) succeeded on connection handle: 0.
****AFTER A FEW SECONDS*****
<debug> ble_db_disc: XXXX: ble_db_discovery_on_ble_evt 17
<info> app: Disconnected. conn_handle: 0x0, reason: 0x8

Parents Reply Children
  • Then the disconnect is not caused by out of spec LFCLK, which can cause BLE_HCI_CONNECTION_TIMEOUT.

    For further debugging I think I need an on-air sniffer log:
    https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Sniffer-for-Bluetooth-LE 
    https://infocenter.nordicsemi.com/pdf/nRF_Sniffer_BLE_UG_v3.2.pdf 

    Kenneth

  • I'm currently getting mixed up with the sniffer so I tried using the nRF connect app to get the log out.

    I saw the disconnect happens with the error: Error 8 (0x8): GATT CONN TIMEOUT.

    and not BLE_HCI_CONNECTION_TIMEOUT as I wrote.

    looking in the forum I saw this post from two years ago and wondered if the bug is a compatibility issue.

    https://devzone.nordicsemi.com/f/nordic-q-a/43081/gatt-conn-timeout

  • I would really like to know why the function sd_ble_gattc_characteristics_discover() which I see is called during the discovery process doesn't trigger the BLE_GATTC_EVT_CHAR_DISC_RSP event as the old androids do. This is the only difference I see between the two flows.

    Any ideas?

    Thanks.

  • A sniffer log should quickly show the reason.

    Kenneth

  • Thanks for all help until now.
    I did the sniffer with the problematic phone (A31) and with the phone that works as wanted (S6 edge). Not sure how to show you the log. I'm attaching the wireshark captures and logs.

    Thanks

    problematic phone log:

    30389	180.939787	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	33	Sent Exchange MTU Request, Client Rx MTU: 247
    30391	180.939787	Master_0x11f6c9b7	Slave_0x11f6c9b7	LE LL	35	Control Opcode: LL_LENGTH_REQ
    30392	180.939787	Slave_0x11f6c9b7	Master_0x11f6c9b7	LE LL	35	Control Opcode: LL_SLAVE_FEATURE_REQ
    30393	180.955413	Master_0x11f6c9b7	Slave_0x11f6c9b7	LE LL	28	Control Opcode: LL_UNKNOWN_RSP
    30394	180.955413	Slave_0x11f6c9b7	Master_0x11f6c9b7	LE LL	35	Control Opcode: LL_LENGTH_RSP
    30396	180.955413	Slave_0x11f6c9b7	Master_0x11f6c9b7	LE LL	32	Control Opcode: LL_VERSION_IND
    30397	180.971037	Master_0x11f6c9b7	Slave_0x11f6c9b7	LE LL	32	Control Opcode: LL_VERSION_IND
    30398	180.971037	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	37	Rcvd Handle Value Indication, Handle: 0x0003 (Unknown)
    30400	180.971037	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	33	Rcvd Exchange MTU Response, Server Rx MTU: 247
    30404	180.986660	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	37	Rcvd Read By Group Type Request, GATT Primary Service Declaration, Handles: 0x0001..0xffff
    30405	181.002284	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	44	Sent Read By Group Type Response, Attribute List Length: 2, Generic Access Profile, Generic Attribute Profile
    30406	181.002284	Slave_0x11f6c9b7	Master_0x11f6c9b7	L2CAP	42	Connection Parameter Update Request
    30407	181.002284	Master_0x11f6c9b7	Slave_0x11f6c9b7	L2CAP	36	Connection Parameter Update Response (Accepted)
    30408	181.002284	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	37	Rcvd Read By Type Request, GATT Include Declaration, Handles: 0x0001..0x0009
    30409	181.017911	Master_0x11f6c9b7	Slave_0x11f6c9b7	LE LL	38	Control Opcode: LL_CONNECTION_UPDATE_REQ
    30411	181.017911	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x0001 (Generic Access Profile)
    30414	181.033530	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x0001..0x0009
    30415	181.033530	Master_0x11f6c9b7	Slave_0x11f6c9b7	LE LL	53	L2CAP Fragment Start
    30417	181.033530	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	33	Sent Read By Type Response, Attribute List Length: 4, Device Name, Appearance, Peripheral Preferred Connection Parameters, Central Address Resolution
    30420	181.049120	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x0009..0x0009
    30421	181.049120	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x0009 (Generic Access Profile: Central Address Resolution)
    30424	181.064719	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	37	Rcvd Read By Type Request, GATT Include Declaration, Handles: 0x000a..0xffff
    30425	181.064719	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x000a (Generic Attribute Profile)
    30428	181.080343	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x000a..0xffff
    30429	181.080343	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x000a (Generic Attribute Profile)
    30432	181.095968	Slave_0x11f6c9b7	Master_0x11f6c9b7	L2CAP	42	Connection Parameter Update Request
    30433	181.095968	Master_0x11f6c9b7	Slave_0x11f6c9b7	L2CAP	36	Connection Parameter Update Response (Accepted)
    30435	181.095968	Master_0x11f6c9b7	Slave_0x11f6c9b7	LE LL	38	Control Opcode: LL_CONNECTION_UPDATE_REQ
    30557	181.971015	Master_0x11f6c9b7	Slave_0x11f6c9b7	SMP	37	Sent Pairing Request: AuthReq: Bonding | Initiator Key(s): LTK, IRK | Responder Key(s): LTK, IRK
    30836	184.080333	Slave_0x11f6c9b7	Master_0x11f6c9b7	SMP	37	Rcvd Pairing Response: AuthReq: Bonding, MITM | Initiator Key(s): LTK, IRK | Responder Key(s): LTK, IRK
    30837	184.095906	Master_0x11f6c9b7	Slave_0x11f6c9b7	SMP	47	Sent Pairing Confirm
    30840	184.111597	Slave_0x11f6c9b7	Master_0x11f6c9b7	SMP	47	Rcvd Pairing Confirm
    30841	184.127219	Master_0x11f6c9b7	Slave_0x11f6c9b7	SMP	47	Sent Pairing Random
    30844	184.142848	Slave_0x11f6c9b7	Master_0x11f6c9b7	SMP	47	Rcvd Pairing Random
    30847	184.174096	Master_0x11f6c9b7	Slave_0x11f6c9b7	LE LL	49	Control Opcode: LL_ENC_REQ
    30850	184.189721	Slave_0x11f6c9b7	Master_0x11f6c9b7	LE LL	39	Control Opcode: LL_ENC_RSP
    30852	184.205346	Slave_0x11f6c9b7	Master_0x11f6c9b7	LE LL	27	Control Opcode: LL_START_ENC_REQ
    30853	184.220971	Master_0x11f6c9b7	Slave_0x11f6c9b7	LE LL	27	Control Opcode: LL_START_ENC_RSP
    30856	184.236596	Slave_0x11f6c9b7	Master_0x11f6c9b7	LE LL	27	Control Opcode: LL_START_ENC_RSP
    30858	184.252156	Slave_0x11f6c9b7	Master_0x11f6c9b7	SMP	47	Rcvd Encryption Information
    30860	184.267778	Slave_0x11f6c9b7	Master_0x11f6c9b7	SMP	41	Rcvd Master Identification
    30862	184.283429	Slave_0x11f6c9b7	Master_0x11f6c9b7	SMP	47	Rcvd Identity Information
    30864	184.299052	Slave_0x11f6c9b7	Master_0x11f6c9b7	SMP	38	Rcvd Identity Address Information
    30865	184.314677	Master_0x11f6c9b7	Slave_0x11f6c9b7	SMP	47	Sent Encryption Information
    30867	184.314677	Master_0x11f6c9b7	Slave_0x11f6c9b7	SMP	41	Sent Master Identification
    30869	184.314677	Master_0x11f6c9b7	Slave_0x11f6c9b7	SMP	47	Sent Identity Information
    30871	184.314677	Master_0x11f6c9b7	Slave_0x11f6c9b7	SMP	38	Sent Identity Address Information
    30940	184.830266	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	39	Rcvd Find By Type Value Request, GATT Primary Service Declaration, Handles: 0x0001..0xffff
    30941	184.830266	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	35	Sent Find By Type Value Response
    30944	184.861518	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x0001..0xffff
    30945	184.861518	Master_0x11f6c9b7	Slave_0x11f6c9b7	LE LL	53	L2CAP Fragment Start
    30947	184.877147	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	33	Sent Read By Type Response, Attribute List Length: 4, Device Name, Appearance, Peripheral Preferred Connection Parameters, Central Address Resolution
    30950	184.877147	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	37	Rcvd Read By Type Request, Device Name, Handles: 0x0001..0xffff
    30951	184.892770	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	39	Sent Read By Type Response, Attribute List Length: 1
    30954	184.908429	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x0009..0xffff
    30955	184.924045	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x0009 (Generic Access Profile: Central Address Resolution)
    31143	186.330238	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	53	Sent Find By Type Value Request, GATT Primary Service Declaration, Handles: 0x0001..0xffff
    31146	186.345877	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	35	Rcvd Find By Type Value Response
    31147	186.361552	Master_0x11f6c9b7	Slave_0x11f6c9b7	ATT	37	Sent Read By Type Request, GATT Characteristic Declaration, Handles: 0x0028..0xffff
    31150	186.377177	Slave_0x11f6c9b7	Master_0x11f6c9b7	ATT	74	Rcvd Read By Type Response, Attribute List Length: 2, Unknown, Unknown
    

    working phone log:

    28401	262.933643	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	33	Sent Exchange MTU Request, Client Rx MTU: 247
    28402	262.933643	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	33	Sent Exchange MTU Request, Client Rx MTU: 247
    28404	262.933643	Master_0x9027eb1f	Slave_0x9027eb1f	LE LL	35	Control Opcode: LL_LENGTH_REQ
    28407	262.949267	Slave_0x9027eb1f	Master_0x9027eb1f	LE LL	35	Control Opcode: LL_SLAVE_FEATURE_REQ
    28408	262.949267	Master_0x9027eb1f	Slave_0x9027eb1f	LE LL	28	Control Opcode: LL_UNKNOWN_RSP
    28411	262.949267	Slave_0x9027eb1f	Master_0x9027eb1f	LE LL	28	Control Opcode: LL_UNKNOWN_RSP
    28415	262.964891	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	33	Rcvd Exchange MTU Response, Server Rx MTU: 247
    28419	262.980585	Slave_0x9027eb1f	Master_0x9027eb1f	LE LL	32	Control Opcode: LL_VERSION_IND
    28420	262.996208	Master_0x9027eb1f	Slave_0x9027eb1f	LE LL	32	Control Opcode: LL_VERSION_IND
    28473	263.183703	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Group Type Request, GATT Primary Service Declaration, Handles: 0x0001..0xffff
    28474	263.199267	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	44	Sent Read By Group Type Response, Attribute List Length: 2, Generic Access Profile, Generic Attribute Profile
    28479	263.214887	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, GATT Include Declaration, Handles: 0x0001..0x0009
    28480	263.214887	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x0001 (Generic Access Profile)
    28483	263.230557	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x0001..0x0009
    28484	263.230557	Master_0x9027eb1f	Slave_0x9027eb1f	LE LL	53	L2CAP Fragment Start
    28486	263.230557	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	33	Sent Read By Type Response, Attribute List Length: 4, Device Name, Appearance, Peripheral Preferred Connection Parameters, Central Address Resolution
    28489	263.246140	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x0009..0x0009
    28490	263.246140	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x0009 (Generic Access Profile: Central Address Resolution)
    28493	263.261764	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, GATT Include Declaration, Handles: 0x000a..0xffff
    28494	263.261764	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x000a (Generic Attribute Profile)
    28499	263.277386	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x000a..0xffff
    28500	263.277386	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x000a (Generic Attribute Profile)
    28672	263.933649	Master_0x9027eb1f	Slave_0x9027eb1f	SMP	37	Sent Pairing Request: AuthReq: Bonding | Initiator Key(s): LTK, IRK | Responder Key(s): LTK, IRK
    28687	263.980563	Slave_0x9027eb1f	Master_0x9027eb1f	SMP	37	Rcvd Pairing Response: AuthReq: Bonding, MITM | Initiator Key(s): LTK, IRK | Responder Key(s): LTK, IRK
    28688	263.996187	Master_0x9027eb1f	Slave_0x9027eb1f	SMP	47	Sent Pairing Confirm
    28693	264.011812	Slave_0x9027eb1f	Master_0x9027eb1f	SMP	47	Rcvd Pairing Confirm
    28694	264.011812	Master_0x9027eb1f	Slave_0x9027eb1f	SMP	47	Sent Pairing Random
    28697	264.027372	Slave_0x9027eb1f	Master_0x9027eb1f	SMP	47	Rcvd Pairing Random
    28700	264.043017	Master_0x9027eb1f	Slave_0x9027eb1f	LE LL	49	Control Opcode: LL_ENC_REQ
    28703	264.043017	Slave_0x9027eb1f	Master_0x9027eb1f	LE LL	39	Control Opcode: LL_ENC_RSP
    28707	264.058618	Slave_0x9027eb1f	Master_0x9027eb1f	LE LL	27	Control Opcode: LL_START_ENC_REQ
    28708	264.058618	Master_0x9027eb1f	Slave_0x9027eb1f	LE LL	27	Control Opcode: LL_START_ENC_RSP
    28711	264.074242	Slave_0x9027eb1f	Master_0x9027eb1f	LE LL	27	Control Opcode: LL_START_ENC_RSP
    28715	264.089933	Slave_0x9027eb1f	Master_0x9027eb1f	SMP	47	Rcvd Encryption Information
    28717	264.089933	Slave_0x9027eb1f	Master_0x9027eb1f	SMP	41	Rcvd Master Identification
    28719	264.089933	Slave_0x9027eb1f	Master_0x9027eb1f	SMP	47	Rcvd Identity Information
    28721	264.089933	Slave_0x9027eb1f	Master_0x9027eb1f	SMP	38	Rcvd Identity Address Information
    28722	264.089933	Master_0x9027eb1f	Slave_0x9027eb1f	SMP	47	Sent Encryption Information
    28724	264.105492	Master_0x9027eb1f	Slave_0x9027eb1f	SMP	41	Sent Master Identification
    28726	264.105492	Master_0x9027eb1f	Slave_0x9027eb1f	SMP	47	Sent Identity Information
    28728	264.105492	Master_0x9027eb1f	Slave_0x9027eb1f	SMP	38	Sent Identity Address Information
    28867	264.621107	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	39	Rcvd Find By Type Value Request, GATT Primary Service Declaration, Handles: 0x0001..0xffff
    28868	264.621107	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Find By Type Value Response
    28875	264.636731	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x0001..0xffff
    28876	264.652356	Master_0x9027eb1f	Slave_0x9027eb1f	LE LL	53	L2CAP Fragment Start
    28878	264.652356	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	33	Sent Read By Type Response, Attribute List Length: 4, Device Name, Appearance, Peripheral Preferred Connection Parameters, Central Address Resolution
    28887	264.683672	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x0009..0xffff
    28888	264.683672	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x0009 (Generic Access Profile: Central Address Resolution)
    28899	264.730546	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Group Type Request, GATT Primary Service Declaration, Handles: 0x0001..0xffff
    28900	264.730546	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	44	Sent Read By Group Type Response, Attribute List Length: 2, Generic Access Profile, Generic Attribute Profile
    28903	264.746169	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, Device Name, Handles: 0x0001..0xffff
    28904	264.746169	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	39	Sent Read By Type Response, Attribute List Length: 1
    28907	264.761794	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, GATT Include Declaration, Handles: 0x0001..0x0009
    28908	264.761794	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x0001 (Generic Access Profile)
    28911	264.777353	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x0001..0x0009
    28912	264.777353	Master_0x9027eb1f	Slave_0x9027eb1f	LE LL	53	L2CAP Fragment Start
    28914	264.777353	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	33	Sent Read By Type Response, Attribute List Length: 4, Device Name, Appearance, Peripheral Preferred Connection Parameters, Central Address Resolution
    28917	264.792979	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x0009..0x0009
    28918	264.792979	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x0009 (Generic Access Profile: Central Address Resolution)
    28921	264.808603	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, GATT Include Declaration, Handles: 0x000a..0xffff
    28922	264.808603	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x000a (Generic Attribute Profile)
    28925	264.824233	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Read By Type Request, GATT Characteristic Declaration, Handles: 0x000a..0xffff
    28926	264.824233	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Error Response - Attribute Not Found, Handle: 0x000a (Generic Attribute Profile)
    29318	266.292947	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	53	Sent Find By Type Value Request, GATT Primary Service Declaration, Handles: 0x0001..0xffff
    29321	266.308574	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	35	Rcvd Find By Type Value Response
    29322	266.308574	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	37	Sent Read By Type Request, GATT Characteristic Declaration, Handles: 0x0028..0xffff
    29325	266.308574	Slave_0x9027eb1f	Master_0x9027eb1f	LE LL	53	L2CAP Fragment Start
    29327	266.324198	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	47	Rcvd Read By Type Response, Attribute List Length: 2, Unknown, Unknown
    29328	266.324198	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	37	Sent Read By Type Request, GATT Characteristic Declaration, Handles: 0x002e..0xffff
    29331	266.324198	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	35	Rcvd Error Response - Attribute Not Found, Handle: 0x002e (Generic Attribute Profile: Unknown: Unknown)
    29332	266.339879	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Find Information Request, Handles: 0x002b..0x002b
    29335	266.339879	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	36	Rcvd Find Information Response, Handle: 0x002b (Generic Attribute Profile: Unknown: Client Characteristic Configuration)
    29336	266.355454	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Find Information Request, Handles: 0x002e..0xffff
    29339	266.355454	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	35	Rcvd Error Response - Attribute Not Found, Handle: 0x002e (Generic Attribute Profile: Unknown: Unknown)
    29412	266.636758	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	35	Sent Write Request, Handle: 0x002b (Generic Attribute Profile: Unknown: Client Characteristic Configuration)
    29419	266.667968	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	31	Rcvd Write Response, Handle: 0x002b (Generic Attribute Profile: Unknown: Client Characteristic Configuration)
    29692	267.683570	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	53	Sent Write Command, Handle: 0x002d (Generic Attribute Profile: Unknown)
    29717	267.777354	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29718	267.792917	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29723	267.808544	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29724	267.808544	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29731	267.824166	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29732	267.839858	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29739	267.855443	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29740	267.871042	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29745	267.886695	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29746	267.886695	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29751	267.902317	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29752	267.917941	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29757	267.933569	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29758	267.933569	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29761	267.949203	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	37	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29762	267.949203	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29771	267.980413	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29772	267.996038	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29777	268.011662	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29778	268.011662	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29783	268.027289	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29784	268.027289	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29786	268.042916	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	42	Sent Write Command, Handle: 0x002d (Generic Attribute Profile: Unknown)
    29789	268.042916	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29790	268.058538	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29795	268.074163	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29796	268.074163	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29801	268.089788	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29802	268.105414	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29809	268.121037	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29810	268.136663	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29815	268.152308	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29816	268.152308	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29821	268.167911	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29822	268.167911	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29827	268.183535	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29828	268.199160	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29833	268.214785	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29834	268.214785	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29839	268.230409	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29840	268.246033	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29845	268.261662	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29846	268.261662	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29851	268.277284	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29852	268.292908	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29857	268.308534	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29858	268.308534	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29863	268.324164	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29864	268.339783	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29869	268.355406	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29870	268.355406	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29877	268.371031	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29878	268.386655	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29883	268.402295	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29884	268.402295	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29889	268.417934	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29890	268.433556	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29897	268.449183	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29898	268.464839	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29903	268.480404	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29904	268.480404	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29906	268.480404	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	42	Sent Write Command, Handle: 0x002d (Generic Attribute Profile: Unknown)
    29911	268.496029	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29912	268.511653	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29933	268.574191	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29934	268.589792	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29989	268.792964	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29990	268.792964	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29995	268.808548	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    29996	268.824212	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30043	268.996078	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30044	268.996078	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30097	269.199181	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30098	269.199181	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30106	269.230445	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	42	Sent Write Command, Handle: 0x002d (Generic Attribute Profile: Unknown)
    30147	269.386643	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30148	269.386643	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30203	269.589757	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30204	269.605382	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30259	269.808502	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	53	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30260	269.808502	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30265	269.824127	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30266	269.839790	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30306	269.980431	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	42	Sent Write Command, Handle: 0x002d (Generic Attribute Profile: Unknown)
    30309	269.996055	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30310	269.996055	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30363	270.199179	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30364	270.199179	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30413	270.386681	Slave_0x9027eb1f	Master_0x9027eb1f	ATT	42	Rcvd Handle Value Indication, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30414	270.386681	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	31	Sent Handle Value Confirmation, Handle: 0x002a (Generic Attribute Profile: Unknown)
    30506	270.730424	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	42	Sent Write Command, Handle: 0x002d (Generic Attribute Profile: Unknown)
    30706	271.480367	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	42	Sent Write Command, Handle: 0x002d (Generic Attribute Profile: Unknown)
    30906	272.230394	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	42	Sent Write Command, Handle: 0x002d (Generic Attribute Profile: Unknown)
    31106	272.980351	Master_0x9027eb1f	Slave_0x9027eb1f	ATT	42	Sent Write Command, Handle: 0x002d (Generic Attribute Profile: Unknown)
    

    a31_withbond.pcapng s6_withbond.pcapng

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