hci_usb, zephyr and bluez

RE: hci_usb, zephyr and bluez

Kenneth — Tue, 30 Jan 2024 14:03:53 GMT

I don't see any problem configuring 7.5ms interval and 2Mbps phy, however whether you will be able to push max data (one-way or bidirectional) for all the potentially serial interfaces is (afaik) not something we have tested in specific no.

Kenneth

RE: hci_usb, zephyr and bluez

john23094 — Tue, 30 Jan 2024 11:54:47 GMT

Hi Kenneth,

Yes that's correct. I learned that hci_uart is ok to flash to nrf52840 dongle as I saw it has USB CDC enabled if you target that board.

I still unsure whether this means I am able to get 2MB PHY and 7.5ms conn. interval with this setup. If USB CDC speed is much higher than I thought this should work. Is there any other KConfig options I need to define in hci_uart to get this?

RE: hci_usb, zephyr and bluez

Kenneth — Sun, 28 Jan 2024 21:45:17 GMT

From my understanding you already have a chat on zephyr discord about this, I suggest to continue there, but please update here any findings that may potentially be helpful for others.

Kenneth

RE: hci_usb, zephyr and bluez

john23094 — Sun, 28 Jan 2024 00:01:06 GMT

Hi Kenneth,

I've had success moving to a nrf52840dk, using HCI UART example.

I think I'm starting to get it that the transport for HCI needs to be fast or it will not be able to keep up and cause issues like I've seen. I guess USB transport on the dongle is too slow.

This made me realise also, the UART speed on the dk is still limited to 1mbps.

On a side note, what would be the best approach for getting a bluetooth controller using NRF52 which bluez can use that can reliably achieve 2MB PHY and 7.5ms conn. interval? USB to SPI? USB to UART? Using CDC UART?

RE: hci_usb, zephyr and bluez

john23094 — Fri, 26 Jan 2024 12:12:33 GMT

Hi Kenneth,

Sorry got pulled aside by some other priorities.

That's interesting I didn't know that. I only used the nrf52840 dongle purely for convenience. I can switch to using an nrf52840dk that I also have, with the HCI UART example and report back if there is any improvement.

RE: hci_usb, zephyr and bluez

Kenneth — Wed, 24 Jan 2024 21:04:00 GMT

Hello,

I have spoken to the developers, maybe I should have done so earlier, but I get the impression that hci over usb as a transport layer is slightly unstable by design; for simple use cases where transfer is not stressed then hci_usb is functional, but for stability you should use uart or spi as hci transport. It seems as most vendors use uart hci transport due to this, e.g. in phones, laptops etc. We plan to add a disclaimer to the hci_usb sample. A suggested workaround is to use compile hci_uart with the cdc uart driver instead (if you need to use usb, and cant use uart or spi directly).

Kenneth

RE: hci_usb, zephyr and bluez

Kenneth — Wed, 24 Jan 2024 12:57:12 GMT

Hello,

Thanks for all the details, I can't find anything wrong, but let me check with the developers what and if they have any comment.

Kenneth

RE: hci_usb, zephyr and bluez

john23094 — Wed, 24 Jan 2024 10:19:54 GMT

Hi Kenneth,

Sure thing. Here is the btmon log for when I delete all device cache from

/var/lib/bluetooth/static-XX:XX:XX:XX:XX:XX

< HCI Command: LE Set Random Address (0x08|0x0005) plen 6                                                                                                   #636 [hci0] 22.534586
        Address: C2:1B:F6:8A:19:72 (Static)
> HCI Event: Command Complete (0x0e) plen 4                                                                                                                 #637 [hci0] 22.536541
      LE Set Random Address (0x08|0x0005) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Add Device To Accept List (0x08|0x0011) plen 7                                                                                            #638 [hci0] 22.538022
        Address type: Random (0x01)
        Address: E4:05:AA:E4:7B:4E (Static)
> HCI Event: Command Complete (0x0e) plen 4                                                                                                                 #639 [hci0] 22.540766
      LE Add Device To Accept List (0x08|0x0011) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7                                                                                                  #640 [hci0] 22.541309
        Type: Passive (0x00)
        Interval: 60.000 msec (0x0060)
        Window: 60.000 msec (0x0060)
        Own address type: Random (0x01)
        Filter policy: Ignore not in accept list (0x01)
> HCI Event: Command Complete (0x0e) plen 4                                                                                                                 #641 [hci0] 22.543977
      LE Set Scan Parameters (0x08|0x000b) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2                                                                                                      #642 [hci0] 22.544203
        Scanning: Enabled (0x01)
        Filter duplicates: Enabled (0x01)
> HCI Event: Command Complete (0x0e) plen 4                                                                                                                 #643 [hci0] 22.547272
      LE Set Scan Enable (0x08|0x000c) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 33                                                                                                                   #644 [hci0] 22.558118
      LE Advertising Report (0x02)
        Num reports: 1
        Event type: Connectable undirected - ADV_IND (0x00)
        Address type: Random (0x01)
        Address: E4:05:AA:E4:7B:4E (Static)
        Data length: 21
        Flags: 0x06
          LE General Discoverable Mode
          BR/EDR Not Supported
        128-bit Service UUIDs (complete): 1 entry
          Vendor specific
        RSSI: -54 dBm (0xca)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2                                                                                                      #645 [hci0] 22.558734
        Scanning: Disabled (0x00)
        Filter duplicates: Disabled (0x00)
> HCI Event: Command Complete (0x0e) plen 4                                                                                                                 #646 [hci0] 22.560328
      LE Set Scan Enable (0x08|0x000c) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Create Connection (0x08|0x000d) plen 25                                                                                                   #647 [hci0] 22.560563
        Scan interval: 60.000 msec (0x0060)
        Scan window: 60.000 msec (0x0060)
        Filter policy: Accept list is not used (0x00)
        Peer address type: Random (0x01)
        Peer address: E4:05:AA:E4:7B:4E (Static)
        Own address type: Random (0x01)
        Min connection interval: 30.00 msec (0x0018)
        Max connection interval: 50.00 msec (0x0028)
        Connection latency: 0 (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                                                                                                                   #648 [hci0] 22.562509
      LE Create Connection (0x08|0x000d) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 31                                                                                                                   #649 [hci0] 22.669880
      LE Enhanced Connection Complete (0x0a)
        Status: Success (0x00)
        Handle: 0
        Role: Central (0x00)
        Peer address type: Random (0x01)
        Peer address: E4:05:AA:E4:7B:4E (Static)
        Local resolvable private address: 00:00:00:00:00:00 (Non-Resolvable)
        Peer resolvable private address: 00:00:00:00:00:00 (Non-Resolvable)
        Connection interval: 50.00 msec (0x0028)
        Connection latency: 0 (0x0000)
        Supervision timeout: 420 msec (0x002a)
        Central clock accuracy: 0x00
@ MGMT Event: Device Connected (0x000b) plen 34                                                                                                         {0x0001} [hci0] 22.670060
        LE Address: E4:05:AA:E4:7B:4E (Static)
        Flags: 0x00000008
          Connection Locally Initiated
        Data length: 21
        Flags: 0x06
          LE General Discoverable Mode
          BR/EDR Not Supported
        128-bit Service UUIDs (complete): 1 entry
          Vendor specific
> HCI Event: LE Meta Event (0x3e) plen 4                                                                                                                    #650 [hci0] 22.673147
      LE Channel Selection Algorithm (0x14)
        Handle: 0
        Algorithm: #2 (0x01)
< HCI Command: LE Read Remote Used Features (0x08|0x0016) plen 2                                                                                            #651 [hci0] 22.690059
        Handle: 0
> HCI Event: Command Status (0x0f) plen 4                                                                                                                   #652 [hci0] 22.691466
      LE Read Remote Used Features (0x08|0x0016) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 11                                                                                                                   #653 [hci0] 22.780370
      LE Data Length Change (0x07)
        Handle: 0
        Max TX octets: 27
        Max TX time: 2120
        Max RX octets: 27
        Max RX time: 2120
> HCI Event: LE Meta Event (0x3e) plen 12                                                                                                                   #654 [hci0] 22.834449
      LE Read Remote Used Features (0x04)
        Status: Success (0x00)
        Handle: 0
        Features: 0x2d 0x41 0x00 0x00 0x00 0x00 0x00 0x00
          LE Encryption
          Extended Reject Indication
          Peripheral-initiated Features Exchange
          LE Data Packet Length Extension
          LE 2M PHY
          Channel Selection Algorithm #2
= bluetoothd: src/device.c:load_gatt_db() No cache for E4:05:AA:E4:7B:4E                                                                                                22.838793
< ACL Data TX: Handle 0 flags 0x00 dlen 7                                                                                                                   #655 [hci0] 22.838264
      ATT: Exchange MTU Request (0x02) len 2
        Client RX MTU: 517
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                      #656 [hci0] 22.888721
        Num handles: 1
        Handle: 0
        Count: 1
< HCI Command: Disconnect (0x01|0x0006) plen 3                                                                                                              #657 [hci0] 54.958014
        Handle: 0
        Reason: Remote User Terminated Connection (0x13)
> HCI Event: Command Status (0x0f) plen 4                                                                                                                   #658 [hci0] 54.961438
      Disconnect (0x01|0x0006) ncmd 1
        Status: Success (0x00)
> HCI Event: Disconnect Complete (0x05) plen 4                                                                                                              #659 [hci0] 55.062179
        Status: Success (0x00)
        Handle: 0
        Reason: Connection Terminated By Local Host (0x16)
@ MGMT Event: Device Disconnected (0x000c) plen 8                                                                                                       {0x0001} [hci0] 55.062295
        LE Address: E4:05:AA:E4:7B:4E (Static)
        Reason: Connection terminated by local host (0x02)

And here is the btmon log now on the 2nd connection attempt, keeping the device cache now:

< HCI Command: LE Set Random Address (0x08|0x0005) plen 6                                                                                                 #1008 [hci0] 178.408369
        Address: C2:1B:F6:8A:19:72 (Static)
> HCI Event: Command Complete (0x0e) plen 4                                                                                                               #1009 [hci0] 178.410590
      LE Set Random Address (0x08|0x0005) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7                                                                                                #1010 [hci0] 178.410656
        Type: Passive (0x00)
        Interval: 60.000 msec (0x0060)
        Window: 60.000 msec (0x0060)
        Own address type: Random (0x01)
        Filter policy: Ignore not in accept list (0x01)
> HCI Event: Command Complete (0x0e) plen 4                                                                                                               #1011 [hci0] 178.413844
      LE Set Scan Parameters (0x08|0x000b) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2                                                                                                    #1012 [hci0] 178.413918
        Scanning: Enabled (0x01)
        Filter duplicates: Enabled (0x01)
> HCI Event: Command Complete (0x0e) plen 4                                                                                                               #1013 [hci0] 178.417104
      LE Set Scan Enable (0x08|0x000c) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 33                                                                                                                 #1014 [hci0] 178.487598
      LE Advertising Report (0x02)
        Num reports: 1
        Event type: Connectable undirected - ADV_IND (0x00)
        Address type: Random (0x01)
        Address: E4:05:AA:E4:7B:4E (Static)
        Data length: 21
        Flags: 0x06
          LE General Discoverable Mode
          BR/EDR Not Supported
        128-bit Service UUIDs (complete): 1 entry
          Vendor specific
        RSSI: -55 dBm (0xc9)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2                                                                                                    #1015 [hci0] 178.487664
        Scanning: Disabled (0x00)
        Filter duplicates: Disabled (0x00)
> HCI Event: Command Complete (0x0e) plen 4                                                                                                               #1016 [hci0] 178.490795
      LE Set Scan Enable (0x08|0x000c) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Create Connection (0x08|0x000d) plen 25                                                                                                 #1017 [hci0] 178.490891
        Scan interval: 60.000 msec (0x0060)
        Scan window: 60.000 msec (0x0060)
        Filter policy: Accept list is not used (0x00)
        Peer address type: Random (0x01)
        Peer address: E4:05:AA:E4:7B:4E (Static)
        Own address type: Random (0x01)
        Min connection interval: 30.00 msec (0x0018)
        Max connection interval: 50.00 msec (0x0028)
        Connection latency: 0 (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                                                                                                                 #1018 [hci0] 178.494044
      LE Create Connection (0x08|0x000d) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 31                                                                                                                 #1019 [hci0] 178.710815
      LE Enhanced Connection Complete (0x0a)
        Status: Success (0x00)
        Handle: 0
        Role: Central (0x00)
        Peer address type: Random (0x01)
        Peer address: E4:05:AA:E4:7B:4E (Static)
        Local resolvable private address: 00:00:00:00:00:00 (Non-Resolvable)
        Peer resolvable private address: 00:00:00:00:00:00 (Non-Resolvable)
        Connection interval: 50.00 msec (0x0028)
        Connection latency: 0 (0x0000)
        Supervision timeout: 420 msec (0x002a)
        Central clock accuracy: 0x00
@ MGMT Event: Device Connected (0x000b) plen 34                                                                                                        {0x0001} [hci0] 178.710935
        LE Address: E4:05:AA:E4:7B:4E (Static)
        Flags: 0x00000008
          Connection Locally Initiated
        Data length: 21
        Flags: 0x06
          LE General Discoverable Mode
          BR/EDR Not Supported
        128-bit Service UUIDs (complete): 1 entry
          Vendor specific
> HCI Event: LE Meta Event (0x3e) plen 4                                                                                                                  #1020 [hci0] 178.713131
      LE Channel Selection Algorithm (0x14)
        Handle: 0
        Algorithm: #2 (0x01)
< HCI Command: LE Read Remote Used Features (0x08|0x0016) plen 2                                                                                          #1021 [hci0] 178.730017
        Handle: 0
> HCI Event: Command Status (0x0f) plen 4                                                                                                                 #1022 [hci0] 178.731280
      LE Read Remote Used Features (0x08|0x0016) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 11                                                                                                                 #1023 [hci0] 178.821351
      LE Data Length Change (0x07)
        Handle: 0
        Max TX octets: 27
        Max TX time: 2120
        Max RX octets: 27
        Max RX time: 2120
> HCI Event: LE Meta Event (0x3e) plen 12                                                                                                                 #1024 [hci0] 178.875574
      LE Read Remote Used Features (0x04)
        Status: Success (0x00)
        Handle: 0
        Features: 0x2d 0x41 0x00 0x00 0x00 0x00 0x00 0x00
          LE Encryption
          Extended Reject Indication
          Peripheral-initiated Features Exchange
          LE Data Packet Length Extension
          LE 2M PHY
          Channel Selection Algorithm #2
= bluetoothd: src/device.c:load_gatt_db() No cache for E4:05:AA:E4:7B:4E                                                                                               178.876464
< ACL Data TX: Handle 0 flags 0x00 dlen 7                                                                                                                 #1025 [hci0] 178.877312
      ATT: Exchange MTU Request (0x02) len 2
        Client RX MTU: 517
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1026 [hci0] 178.928551
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 7                                                                                                                 #1027 [hci0] 179.036965
      ATT: Exchange MTU Response (0x03) len 2
        Server RX MTU: 498
< ACL Data TX: Handle 0 flags 0x00 dlen 11                                                                                                                #1028 [hci0] 179.037497
      ATT: Read By Type Request (0x08) len 6
        Handle range: 0x0001-0xffff
        Attribute type: Server Supported Features (0x2b3a)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1029 [hci0] 179.092234
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 9                                                                                                                 #1030 [hci0] 179.145242
      ATT: Error Response (0x01) len 4
        Read By Type Request (0x08)
        Handle: 0x0001
        Error: Attribute Not Found (0x0a)
< ACL Data TX: Handle 0 flags 0x00 dlen 11                                                                                                                #1031 [hci0] 179.146071
      ATT: Read By Group Type Request (0x10) len 6
        Handle range: 0x0001-0xffff
        Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1032 [hci0] 179.254730
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 18                                                                                                                #1033 [hci0] 179.307787
      ATT: Read By Group Type Response (0x11) len 13
        Attribute data length: 6
        Attribute group list: 2 entries
        Handle range: 0x0001-0x0008
        UUID: Generic Attribute Profile (0x1801)
        Handle range: 0x0009-0x000f
        UUID: Generic Access Profile (0x1800)
< ACL Data TX: Handle 0 flags 0x00 dlen 11                                                                                                                #1034 [hci0] 179.308215
      ATT: Read By Group Type Request (0x10) len 6
        Handle range: 0x0010-0xffff
        Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1035 [hci0] 179.363051
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 26                                                                                                                #1036 [hci0] 179.416189
      ATT: Read By Group Type Response (0x11) len 21
        Attribute data length: 20
        Attribute group list: 1 entry
        Handle range: 0x0010-0x0013
        UUID: Vendor specific (8d53dc1d-1db7-4cd3-868b-8a527460aa84)
< ACL Data TX: Handle 0 flags 0x00 dlen 11                                                                                                                #1037 [hci0] 179.416630
      ATT: Read By Group Type Request (0x10) len 6
        Handle range: 0x0014-0xffff
        Attribute group type: Primary Service (0x2800)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1038 [hci0] 179.471264
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 9                                                                                                                 #1039 [hci0] 179.524255
      ATT: Error Response (0x01) len 4
        Read By Group Type Request (0x10)
        Handle: 0x0014
        Error: Attribute Not Found (0x0a)
< ACL Data TX: Handle 0 flags 0x00 dlen 11                                                                                                                #1040 [hci0] 179.524596
      ATT: Read By Group Type Request (0x10) len 6
        Handle range: 0x0001-0xffff
        Attribute group type: Secondary Service (0x2801)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1041 [hci0] 179.579608
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 9                                                                                                                 #1042 [hci0] 179.632597
      ATT: Error Response (0x01) len 4
        Read By Group Type Request (0x10)
        Handle: 0x0001
        Error: Attribute Not Found (0x0a)
< ACL Data TX: Handle 0 flags 0x00 dlen 11                                                                                                                #1043 [hci0] 179.633199
      ATT: Read By Type Request (0x08) len 6
        Handle range: 0x0001-0x0013
        Attribute type: Include (0x2802)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1044 [hci0] 179.686980
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 9                                                                                                                 #1045 [hci0] 179.741089
      ATT: Error Response (0x01) len 4
        Read By Type Request (0x08)
        Handle: 0x0001
        Error: Attribute Not Found (0x0a)
< ACL Data TX: Handle 0 flags 0x00 dlen 11                                                                                                                #1046 [hci0] 179.741625
      ATT: Read By Type Request (0x08) len 6
        Handle range: 0x0001-0x0013
        Attribute type: Characteristic (0x2803)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1047 [hci0] 179.795247
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 27                                                                                                                #1048 [hci0] 179.849269
> ACL Data RX: Handle 0 flags 0x01 dlen 21                                                                                                                #1049 [hci0] 179.850236
      ATT: Read By Type Response (0x09) len 43
        Attribute data length: 7
        Attribute data list: 6 entries
        Handle: 0x0002
        Value: 200300052a
        Handle: 0x0005
        Value: 0a0600292b
        Handle: 0x0007
        Value: 0208002a2b
        Handle: 0x000a
        Value: 0a0b00002a
        Handle: 0x000c
        Value: 020d00012a
        Handle: 0x000e
        Value: 020f00042a
< ACL Data TX: Handle 0 flags 0x00 dlen 11                                                                                                                #1050 [hci0] 179.850465
      ATT: Read By Type Request (0x08) len 6
        Handle range: 0x000f-0x0013
        Attribute type: Characteristic (0x2803)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1051 [hci0] 179.903692
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 27                                                                                                                #1052 [hci0] 179.957987
      ATT: Read By Type Response (0x09) len 22
        Attribute data length: 21
        Attribute data list: 1 entry
        Handle: 0x0011
        Value: 141200487c997411269eae014ecefb28782eda
< ACL Data TX: Handle 0 flags 0x00 dlen 11                                                                                                                #1053 [hci0] 179.958628
      ATT: Read By Type Request (0x08) len 6
        Handle range: 0x0012-0x0013
        Attribute type: Characteristic (0x2803)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1054 [hci0] 180.011926
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 9                                                                                                                 #1055 [hci0] 180.066114
      ATT: Error Response (0x01) len 4
        Read By Type Request (0x08)
        Handle: 0x0012
        Error: Attribute Not Found (0x0a)
< ACL Data TX: Handle 0 flags 0x00 dlen 11                                                                                                                #1056 [hci0] 180.066656
      ATT: Read By Type Request (0x08) len 6
        Handle range: 0x0001-0xffff
        Attribute type: Database Hash (0x2b2a)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1057 [hci0] 180.120217
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 24                                                                                                                #1058 [hci0] 180.174341
      ATT: Read By Type Response (0x09) len 19
        Attribute data length: 18
        Attribute data list: 1 entry
        Handle: 0x0008
        Value: 850395f13e6ee0d61c35cd65f2649921
< ACL Data TX: Handle 0 flags 0x00 dlen 11                                                                                                                #1059 [hci0] 180.174760
      ATT: Read By Type Request (0x08) len 6
        Handle range: 0x0009-0xffff
        Attribute type: Database Hash (0x2b2a)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1060 [hci0] 180.228549
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 9                                                                                                                 #1061 [hci0] 180.283014
      ATT: Error Response (0x01) len 4
        Read By Type Request (0x08)
        Handle: 0x0009
        Error: Attribute Not Found (0x0a)
< ACL Data TX: Handle 0 flags 0x00 dlen 8                                                                                                                 #1062 [hci0] 180.288344
      ATT: Write Request (0x12) len 3
        Handle: 0x0006
          Data: 05
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1063 [hci0] 180.336891
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 5                                                                                                                 #1064 [hci0] 180.391196
      ATT: Write Response (0x13) len 0
< ACL Data TX: Handle 0 flags 0x00 dlen 9                                                                                                                 #1065 [hci0] 180.391885
      ATT: Write Request (0x12) len 4
        Handle: 0x0004
          Data: 0200
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1066 [hci0] 180.445129
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 5                                                                                                                 #1067 [hci0] 180.499211
      ATT: Write Response (0x13) len 0
< ACL Data TX: Handle 0 flags 0x00 dlen 7                                                                                                                 #1068 [hci0] 180.499364
      ATT: Read Request (0x0a) len 2
        Handle: 0x000b
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1069 [hci0] 180.553488
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 12                                                                                                                #1070 [hci0] 180.607552
      ATT: Read Response (0x0b) len 7
        Value: 4f524220444655
< ACL Data TX: Handle 0 flags 0x00 dlen 7                                                                                                                 #1071 [hci0] 180.607706
      ATT: Read Request (0x0a) len 2
        Handle: 0x000d
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1072 [hci0] 180.661812
        Num handles: 1
        Handle: 0
        Count: 1
> ACL Data RX: Handle 0 flags 0x02 dlen 7                                                                                                                 #1073 [hci0] 180.717933
      ATT: Read Response (0x0b) len 2
        Value: 0000
> ACL Data RX: Handle 0 flags 0x02 dlen 16                                                                                                                #1074 [hci0] 184.128488
      LE L2CAP: Connection Parameter Update Request (0x12) ident 2 len 8
        Min interval: 24
        Max interval: 40
        Peripheral latency: 0
        Timeout multiplier: 42
@ MGMT Event: New Connection Parameter (0x001c) plen 16                                                                                                {0x0001} [hci0] 184.128587
        Store hint: Reserved (0x4e)
        LE Address: 02:E4:05:AA:E4:7B (OUI 02-E4-05)
        Min connection interval: 24
        Max connection interval: 40
        Connection latency: 0 (0x0000)
        Supervision timeout: 42
< ACL Data TX: Handle 0 flags 0x00 dlen 10                                                                                                                #1075 [hci0] 184.128691
      LE L2CAP: Connection Parameter Update Response (0x13) ident 2 len 2
        Result: Connection Parameters accepted (0x0000)
< HCI Command: LE Connection Update (0x08|0x0013) plen 14                                                                                                 #1076 [hci0] 184.128721
        Handle: 0
        Min connection interval: 30.00 msec (0x0018)
        Max connection interval: 50.00 msec (0x0028)
        Connection latency: 0 (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                                                                                                                 #1077 [hci0] 184.130608
      LE Connection Update (0x08|0x0013) ncmd 1
        Status: Success (0x00)
> HCI Event: Number of Completed Packets (0x13) plen 5                                                                                                    #1078 [hci0] 184.237399
        Num handles: 1
        Handle: 0
        Count: 1
> HCI Event: LE Meta Event (0x3e) plen 10                                                                                                                 #1079 [hci0] 184.507661
      LE Connection Update Complete (0x03)
        Status: Success (0x00)
        Handle: 0
        Connection interval: 50.00 msec (0x0028)
        Connection latency: 0 (0x0000)
        Supervision timeout: 420 msec (0x002a)

Some more info:

Bluez Version: 5.64-0ubuntu1.1

nRF Connect SDK v2.5.1

Like I said with the steps in my first post, you should be able to recreate it quite easily on any ubuntu machine, it's very recreate-able for me every time.

Ideally I'd like to be able to reliably get connections to work first time without having to have the device cache available as I need to perform some batch testing of new boards via BLE.

RE: hci_usb, zephyr and bluez

Kenneth — Wed, 24 Jan 2024 08:58:27 GMT

Hello again,

Do you also have the btmon log of second attempt that succeeds?

Edit: Which release of ncs are you using btw?

Kenneth

RE: hci_usb, zephyr and bluez

john23094 — Tue, 23 Jan 2024 16:41:09 GMT

Here is the log, I also have

CONFIG_BT_CTLR_PHY_2M=n

CONFIG_BT_AUTO_DATA_LEN_UPDATE=n

CONFIG_BT_AUTO_PHY_UPDATE=n

All set to see if it is any of those negotiations causing the issue, but it seems the same

devzone.nordicsemi.com/.../failed-connect_2C00_-auto-DL-extension-disabled.pcapng

RE: hci_usb, zephyr and bluez

Kenneth — Tue, 23 Jan 2024 15:27:28 GMT

The only difference is the sequence of the two first packets, ref:

Out of curiosity, if you on the peripheral side disable the auto length update procedure, does this make any difference?

E.g. try CONFIG_BT_AUTO_DATA_LEN_UPDATE=n on the peripheral. This test may narrow down a bit the issue.

Kenneth

RE: hci_usb, zephyr and bluez

john23094 — Tue, 23 Jan 2024 14:55:46 GMT

Ah sorry - I see what you mean, here is the logs from when bluez connects and succeeds on the 2nd attempt. From what I can see it looks the same, but just continues immediately to read the GATT table, at least from what I understand.

I'm still completely unsure why this is the case, it seems like some kind of state machine issue, but I'm struggling to find the culprit, is it zephyr, bluez or the hci_usb dongle

devzone.nordicsemi.com/.../successful-connect-bluez-on-2nd-attempt.pcapng

RE: hci_usb, zephyr and bluez

Kenneth — Tue, 23 Jan 2024 14:42:06 GMT

Thank you for this, but you write that the second time you connect with bluez it works, so I would like to get the sniffer log for that one also. I want to understand the difference between first and second attempt.

Kenneth

RE: hci_usb, zephyr and bluez

john23094 — Tue, 23 Jan 2024 12:55:30 GMT

Sure, you mean the wireshark logs? here they are for both scenarios, linux host and bluez vs galaxy S23

devzone.nordicsemi.com/.../sucessful-connect-with-s23.pcapng

devzone.nordicsemi.com/.../failed-conect-bluez.pcapng

RE: hci_usb, zephyr and bluez

Kenneth — Tue, 23 Jan 2024 12:51:35 GMT

Can you share the actual logs? Also it would be good to look at the second connection that works, to compare if there is any difference between the first and second in regards to the sequence up until it stops.

Kenneth