[CYW20706] "Reason: LMP Response Timeout / LL Response Timeout" Error

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JoPa_4819621
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I attached CYW20706 to the embedded linux system by referring to the blog below.

https://community.cypress.com/community/software-forums/linux/blog/2019/06/30/running-bluez-on-cy-pa...

And the bluetooth_6lowpan module was loaded in the host Linux and connected with the ble sensor with the following command.

(The linux kernel version is 3.18.)

insmod 6lowpan.ko

insmod bluetooth_6lowpan.ko

hcitool lescan

echo 35> /sys/kernel/debug/bluetooth/6lowpan_psm

echo "connect 00:DD:F6:FF:20:DD 1"> /sys/kernel/debug/bluetooth/6lowpan_control

However, after about 40 seconds, the connection is disconnected with the following log output.

> HCI Event: Disconnect Complete (0x05) plen 4                 [hci0] 52.827451

        Status: Success (0x00)

        Handle: 64

        Reason: LMP Response Timeout / LL Response Timeout (0x22)

What should I check?

Any help will appreciated, thanks in advance.

below is all logs to start from echo "connect 00:DD:F6:FF:20:DD 1"> /sys/kernel/debug/bluetooth/6lowpan_control

------ btmon Log -----

/ # btmon

Bluetooth monitor ver 5.33

= New Index: 51:51:05:97:58:13 (BR/EDR,UART,hci0)               [hci0] 0.844470

< HCI Command: LE Create Connection (0x08|0x000d) plen 25      [hci0] 10.535435

        Scan interval: 60.000 msec (0x0060)

        Scan window: 30.000 msec (0x0030)

        Filter policy: White list is not used (0x00)

        Peer address type: Public (0x00)

        Peer address: 00:9E:42:54:30:32 (OUI 00-9E-42)

        Own address type: Public (0x00)

        Min connection interval: 50.00 msec (0x0028)

        Max connection interval: 70.00 msec (0x0038)

        Connection latency: 0x0000

        Supervision timeout: 420 msec (0x002a)

        Min connection length: 0.000 msec (0x0000)

        Max connection length: 0.000 msec (0x0000)

> HCI Event: Command Status (0x0f) plen 4                      [hci0] 10.545040

      LE Create Connection (0x08|0x000d) ncmd 1

        Status: Success (0x00)

> HCI Event: LE Meta Event (0x3e) plen 19                      [hci0] 12.526027

      LE Connection Complete (0x01)

        Status: Success (0x00)

        Handle: 64

        Role: Master (0x00)

        Peer address type: Public (0x00)

        Peer address: 00:9E:42:54:30:32 (OUI 00-9E-42)

        Connection interval: 67.50 msec (0x0036)

        Connection latency: 0.00 msec (0x0000)

        Supervision timeout: 420 msec (0x002a)

        Master clock accuracy: 0x00

< ACL Data TX: Handle 64 flags 0x00 dlen 18                    [hci0] 12.526401

      LE L2CAP: LE Connection Request (0x14) ident 1 len 10

        PSM: 35 (0x0023)

        Source CID: 64

        MTU: 65535

        MPS: 230

        Credits: 10

@ Device Connected: 00:9E:42:54:30:32 (1) flags 0x0000

> ACL Data RX: Handle 64 flags 0x02 dlen 18                    [hci0] 12.799229

      LE L2CAP: LE Connection Response (0x15) ident 1 len 10

        Destination CID: 64

        MTU: 1280

        MPS: 50

        Credits: 0

        Result: Connection successful (0x0000)

> HCI Event: Number of Completed Packets (0x13) plen 5         [hci0] 12.903041

        Num handles: 1

        Handle: 64

        Count: 1

> ACL Data RX: Handle 64 flags 0x02 dlen 27                    [hci0] 13.270589

> ACL Data RX: Handle 64 flags 0x01 dlen 7                     [hci0] 13.270618

      Channel: 64 len 30 [PSM 35 mode 0] {chan 0}

        1c 00 7b 3b 3a 02 85 00 95 dc 00 00 00 00 01 02  ..{;:...........

        00 9e 42 ff fe 54 30 32 00 00 00 00 00 00        ..B..T02......

> ACL Data RX: Handle 64 flags 0x02 dlen 12                    [hci0] 13.270624

      LE L2CAP: LE Flow Control Credit (0x16) ident 3 len 4

        Source CID: 64

        Credits: 1

> ACL Data RX: Handle 64 flags 0x02 dlen 12                    [hci0] 13.272317

      LE L2CAP: LE Flow Control Credit (0x16) ident 5 len 4

        Source CID: 64

        Credits: 1

< ACL Data TX: Handle 64 flags 0x00 dlen 54                    [hci0] 14.151062

      Channel: 64 len 50 [PSM 35 mode 0] {chan 0}

        50 00 79 3b 00 16 3a 00 05 02 00 00 01 00 8f 00  P.y;..:.........

        63 2f 00 00 00 03 04 00 00 00 ff 02 00 00 00 00  c/..............

        00 00 00 00 00 01 ff 00 00 00 04 00 00 00 ff 02  ................

        00 00                                            ..           

< ACL Data TX: Handle 64 flags 0x00 dlen 36                    [hci0] 14.151105

      Channel: 64 len 32 [PSM 35 mode 0] {chan 0}

        00 00 00 00 00 00 00 01 ff 97 58 13 04 00 00 00  ..........X.....

        ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 02  ................

> ACL Data RX: Handle 64 flags 0x02 dlen 12                    [hci0] 14.217916

      LE L2CAP: LE Flow Control Credit (0x16) ident 7 len 4

        Source CID: 64

        Credits: 3

< ACL Data TX: Handle 64 flags 0x00 dlen 46                    [hci0] 14.279803

      Channel: 64 len 42 [PSM 35 mode 0] {chan 0}

        28 00 79 3b 00 16 3a 00 05 02 00 00 01 00 8f 00  (.y;..:.........

        c1 0d 00 00 00 01 04 00 00 00 ff 02 00 00 00 00  ................

        00 00 00 00 00 01 ff 00 00 00                    ..........   

> HCI Event: Number of Completed Packets (0x13) plen 5         [hci0] 14.283945

        Num handles: 1

        Handle: 64

        Count: 2

< ACL Data TX: Handle 64 flags 0x00 dlen 54                    [hci0] 14.300720

      Channel: 64 len 50 [PSM 35 mode 0] {chan 0}

        50 00 79 3b 00 16 3a 00 05 02 00 00 01 00 8f 00  P.y;..:.........

        63 2f 00 00 00 03 04 00 00 00 ff 02 00 00 00 00  c/..............

        00 00 00 00 00 01 ff 00 00 00 04 00 00 00 ff 02  ................

        00 00                                            ..           

< ACL Data TX: Handle 64 flags 0x00 dlen 36                    [hci0] 14.300776

      Channel: 64 len 32 [PSM 35 mode 0] {chan 0}

        00 00 00 00 00 00 00 01 ff 97 58 13 04 00 00 00  ..........X.....

        ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 02  ................

> HCI Event: Number of Completed Packets (0x13) plen 5         [hci0] 14.421437

        Num handles: 1

        Handle: 64

        Count: 2

> ACL Data RX: Handle 64 flags 0x02 dlen 12                    [hci0] 14.486576

      LE L2CAP: LE Flow Control Credit (0x16) ident 9 len 4

        Source CID: 64

        Credits: 3

> HCI Event: Number of Completed Packets (0x13) plen 5         [hci0] 14.655443

        Num handles: 1

        Handle: 64

        Count: 1

> ACL Data RX: Handle 64 flags 0x02 dlen 27                    [hci0] 27.986759

> ACL Data RX: Handle 64 flags 0x01 dlen 25                    [hci0] 27.986787

      Channel: 64 len 48 [PSM 35 mode 0] {chan 0}

        2e 00 7e 30 20 01 0d b8 00 00 00 00 00 00 00 00  ..~0 ...........

        00 00 00 01 f0 16 33 16 33 3a 16 42 03 00 01 01  ......3.3:.B....

        02 b5 63 68 65 63 6b 11 2a ff 00 9e 42 54 30 32  ..check.*...BT02

< ACL Data TX: Handle 64 flags 0x00 dlen 54                    [hci0] 27.992309

      Channel: 64 len 50 [PSM 35 mode 0] {chan 0}

        50 00 7a 33 3a 01 02 6c 25 00 00 00 00 60 00 00  P.z3:..l%....`..

        00 00 1d 11 40 fe 80 00 00 00 00 00 00 02 9e 42  ....@..........B

        ff fe 54 30 32 20 01 0d b8 00 00 00 00 00 00 00  ..T02 ..........

        00 00                                            ..           

< ACL Data TX: Handle 64 flags 0x00 dlen 36                    [hci0] 27.992381

      Channel: 64 len 32 [PSM 35 mode 0] {chan 0}

        00 00 01 16 33 16 33 00 1d 3a 16 42 03 00 01 01  ....3.3..:.B....

        02 b5 63 68 65 63 6b 11 2a ff 00 9e 42 54 30 32  ..check.*...BT02

> HCI Event: Number of Completed Packets (0x13) plen 5         [hci0] 28.121657

        Num handles: 1

        Handle: 64

        Count: 2

> ACL Data RX: Handle 64 flags 0x02 dlen 12                    [hci0] 28.188928

      LE L2CAP: LE Flow Control Credit (0x16) ident 11 len 4

        Source CID: 64

        Credits: 2

> HCI Event: Disconnect Complete (0x05) plen 4                 [hci0] 52.827451

        Status: Success (0x00)

        Handle: 64

        Reason: LMP Response Timeout / LL Response Timeout (0x22)

@ Device Disconnected: 00:9E:42:54:30:32 (1) reason 0

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2 Replies
AnjanaM_61
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5 comments on KBA First comment on KBA 5 questions asked

Hello,

Can you please let us know what is the peer device you are trying to connect ?

Can you please try sending HCI commands using CyBluetool (CyBluetool (Linux Installer) ) and see if you still getting the disconnection?

Just want to check if the issue happens only with Bluez or not

Regards,

Anjana

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hello

Thank you for your reply.

1. Can you please let us know what is the peer device you are trying to connect ?

     - The device I'm trying to connect is a temperature sensor. (Nordic Semiconductor ASA)

     - below is result of hcitool leinfo <bdaddr>

------------------------------------------------------------ Log Start ------------------------------------------------------------

@ Device Connected: 00:9E:42:54:30:32 (1) flags 0x0000

< HCI Command: Read Remote Version I.. (0x01|0x001d) plen 2  [hci0] 2059.058465

        Handle: 64

> HCI Event: Command Status (0x0f) plen 4                    [hci0] 2059.059763

      Read Remote Version Information (0x01|0x001d) ncmd 1

        Status: Success (0x00)

> HCI Event: Read Remote Version Complete (0x0c) plen 8      [hci0] 2059.103789

        Status: Success (0x00)

        Handle: 64

        LMP version: Reserved (0x09) - Subversion 157 (0x009d)

        Manufacturer: Nordic Semiconductor ASA (89)

< HCI Command: LE Read Remote Used F.. (0x08|0x0016) plen 2  [hci0] 2059.107982

        Handle: 64

> HCI Event: Command Status (0x0f) plen 4                    [hci0] 2059.108906

      LE Read Remote Used Features (0x08|0x0016) ncmd 1

        Status: Success (0x00)

< HCI Command: Disconnect (0x01|0x0006) plen 3               [hci0] 2079.132169

        Handle: 64

        Reason: Remote User Terminated Connection (0x13)

> HCI Event: Command Status (0x0f) plen 4                    [hci0] 2079.133781

      Disconnect (0x01|0x0006) ncmd 1

        Status: Success (0x00)

> HCI Event: LE Meta Event (0x3e) plen 12                    [hci0] 2079.150168

      LE Read Remote Used Features (0x04)

        Status: Connection Terminated By Local Host (0x16)

        Handle: 64

        Features: 0xff 0x00 0x00 0x08 0x00 0x00 0x00 0x00

          LE Encryption

          Connection Parameter Request Procedure

          Extended Reject Indication

          Slave-initiated Features Exchange

          LE Ping

          LE Data Packet Length Extension

          LL Privacy

          Extended Scanner Filter Policies

          Unknown features (0x0000000008000000)

> HCI Event: Disconnect Complete (0x05) plen 4               [hci0] 2079.150205

        Status: Success (0x00)

        Handle: 64

        Reason: Connection Terminated By Local Host (0x16)

@ Device Disconnected: 00:9E:42:54:30:32 (1) reason 2

------------------------------------------------------------ Log End ------------------------------------------------------------

2. Can you please try sending HCI commands using CyBluetool (CyBluetool (Linux Installer) ) and see if you still getting the disconnection?

     - I will reply the results after testing.

3. update the issue

     - kernel version : 3.18.44,     Bluez version : 5.33

     - When connected to sensor by echo "connect 00:DD:F6:FF:20:DD 1"> /sys/kernel/debug/bluetooth/6lowpan_control,

       icmpv6 bad checksum error occurs on the sensor side.

   

      - below is sensor side log.

------------------------------------------------------------ Log Start ------------------------------------------------------------

<info> app: Physical layer: connected.

<info> app: Got IP Application Handler Event on interface 0x0x200058E8

<info> app: New interface added!

<info> app: Sending Router Solicitation to all routers!

<error> ipv6: Packet received on unknown address!

<error> ipv6: Got unsupported protocol packet. Protocol ID = 0x0!

<error> ipv6: Got unsupported protocol packet. Protocol ID = 0x0!

<error> ipv6: Packet received on unknown address!

<error> ipv6: Got unsupported protocol packet. Protocol ID = 0x0!

<error> ipv6: Packet received on unknown address!

<error> ipv6: Packet received on unknown address!

<info> app: Check Cloud Status:0xC344, Code:0x0

<error> icmp6: Bad checksum detected. Got 0x000030B6 but expected 0x00000400, 0x00000045

<info> app: CHECK: 536893672 0 0

<info> app: CHECK SERVER

<error> icmp6: Bad checksum detected. Got 0x000030B6 but expected 0x00000400, 0x00000045

<info> app: Got IP Application Handler Event on interface 0x0x200058E8

<info> app: Interface removed! 

<info> app: Physical layer: disconnected.

<info> app: Physical layer in connectable mode.

<info> app: coap_error_handler: 0xC244

<info> app: Check Cloud Status:0xC344, Code:0x0

<info> app: RETCHK: 0 0 0 0

<info> app: coap_error_handler: 0xC244

<info> app: Check Cloud Status:0xC344, Code:0x0

<info> app: RETCHK: 0 0 0 0

------------------------------------------------------------ Log End ------------------------------------------------------------

     - After connecting to the sensor, I must execute the command below to prevent the sensor from disconnecting.

          hcitool lecup --handle 64 --min 6 --max 100 --latency 30 --timeout 3200

  

      However, the command fails with the following log. And after about 40 seconds, the sensor disconnects.

          Could not change connection params: Connection timed out(110)

     - I think the issue is similar following link.

           HCI UART with Linux host cannot connect to nrf52 6lowpan peripheral · Issue #7999 · zephyrproject-rt...

    

     - If i'm wrong, ignore the following.

     On the link, the nrf52840 is host controller.

     Of course i know cyw20706 and nrf52840 are different.

     But he solved the issue by defining BLE_6LOWPAN_LEGACY_MODE.

     in nordic, BLE_6LOWPAN_LEGACY_MODE is descripted a following.

     https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v14.2.0/group__ble__6lowpan__conf...

     So I would like to ask if cyw20706 has similar features as above.

     The following is the code downloaded to cyw20706 by referring to the link( Re: CYW20719 in HCI mode ).

------------------------------------------------------------ Code Start ------------------------------------------------------------

const wiced_transport_cfg_t transport_cfg =

{

    .type = WICED_TRANSPORT_UART,

    .cfg =

    {

        .uart_cfg =

        {

            .mode = WICED_TRANSPORT_UART_HCI_MODE,

            .baud_rate =  115200

//            .baud_rate =  HCI_UART_DEFAULT_BAUD

        },

    },

    .rx_buff_pool_cfg =

    {

        .buffer_size = 0,

        .buffer_count = 0

    },

    .p_status_handler = NULL,

    .p_data_handler = NULL,

    .p_tx_complete_cback = NULL

};

APPLICATION_START() {

    wiced_transport_init( &transport_cfg );

}

------------------------------------------------------------ Code end ------------------------------------------------------------

Thank you.

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