Fail to connect sample bluetooth HID with Tizen OS (BT_HCI_ERR_DIFF_TRANS_COLLISION)

[Olivier-ProGlove]

I am trying to connect Nordic nRF52840 dev kit using last version of Zephyr (859c4ed west: Fix unused import and variable - Tue May 7) with Samsung Gear S3 latest version of Tizen OS 4.0.0.2.

To Reproduce

1. Build sample HID samples/bluetooth/peripheral_hids and flash on nrf52840_pca10056
2. Connect Tizen to Nordic DevKit
3. Tizen cannot connect and Zephyr returns the error <inf> main: Disconnected from (reason 42)

Expected behavior
It is expected Tizen OS to be able to connect to Zephyr board.
FYI, I removed passphrase in the sample HID. So no passphrase is expected to be asked and I confirm it works with other OSes.

Impact
Zephyr Bluetooth devices cannot be connected to Tizen OS.

Screenshots or console output
I have duplicated the issue two times. I have added the btmon traces and the Wireshark Nordic's sniffer traces (I cannot see the disconnection packet in the sniffer trace):
tizen-github-issue1.zip

The log (with the default logging level) does not show much:

***** Booting Zephyr OS zephyr-v1.14.0-578-g7abd268e9db2 *****
Bluetooth initialized
Advertising successfully started
[00:00:00.199,300] <inf> bt_hci_core: HW Platform: Nordic Semiconductor (0x0002)
[00:00:00.199,300] <inf> bt_hci_core: HW Variant: nRF52x (0x0002)
[00:00:00.199,300] <inf> bt_hci_core: Firmware: Standard Bluetooth controller (0x00) Version 1.14 Build 99
[00:00:00.247,600] <wrn> bt_hci_core: No ID address. App must call settings_load()
[00:00:00.283,000] <inf> bt_hci_core: Identity: ea:ac:67:83:44:59 (random)
[00:00:00.283,000] <inf> bt_hci_core: HCI: version 5.0 (0x09) revision 0x0000, manufacturer 0x05f1
[00:00:00.283,000] <inf> bt_hci_core: LMP: version 5.0 (0x09) subver 0xffff
[00:01:13.410,700] <inf> main: Connected to 'e4:d8:e3:3a:14:5a (random)'
[00:01:13.673,000] <inf> main: Disconnected from  (reason 42)

Environment (please complete the following information):

• OS: Tizen 4.0.0.2 (I was told it was working with Tizen 3.x)
• Latest Zephyr: 859c4ed west: Fix unused import and variable - Tue May 7

cc: @carlescufi @joerchan @cvinayak

[joerchan]

@Olivier-ProGlove This seems to be a bug in the phone side.
It initiates 2 LL procedures with overlapping instant. The Zephyr controller is correct in dropping the link with error code transaction collision.

Procedures in error (sniffer-trace1)
3: PHY_UPDATE_IND(instant = 9)
5: CONN_UPDATE_REQ(instant = 12)

As a workaround you could disable CONFIG_BT_AUTO_PHY_UPDATE, since the masters PHY_UPDATE_IND is a response to the peripherals PHY_REQ.

[Olivier-ProGlove]

It looks you are right. I tried to disable CONFIG_BT_PHY_UPDATE=n and I could connect to Tizen OS.

I actually noticed after testing this workaround a similar bug existed for Samsung S8: #13396 with the same workaround :-)