Problem with attaching devices

[BAzili073]

Hello.
We use nRF52840 as devices. And use a RPi as a border router.
We had a problem of joining attaching devices to the network.
Device may attach and may not depending on which device's Parent Response it will receive last: if it's ot-br on RPi it attaches fine, if it's another device then child ID response from it never arrives so attach timeouts.

During the debug, we found out that disabling OPENTHREAD_CONFIG_DROP_MESSAGE_ON_FRAGMENT_TX_FAILURE for the device that sends Child ID response helped to attaching device finally receive Id responce and enter the network

What is the the root of a problem and is this the correct solution?

dev1_fail_to_dev2_succ_to_Rpi.log
dev1_succ_to_dev.log
dev1_fail.log
dev2_succ.log
dev2_fail.log

[jwhui]

From the logs, it appears that there are many transmission failures with no-ack errors. This could be due to poor RF connectivity between the devices.

Which nRF52840 devices are you using? What is the received signal strength being reported for received messages in the OpenThread logs on the RPi?

[BAzili073]

Thanks for such fast answer!
We use devices of our own production based on nRF52840
Here is the log from RPi.
RPi.log
| PAN | MAC Address | Ch | dBm | LQI |
+------+------------------+----+-----+-----+
| f0c6 | 02925165732a45d4 | 11 | -50 | 172 |
| f0c6 | a6678815ccf4d899 | 11 | -46 | 184 |
| f0c6 | e6fd73c544781877 | 11 | -60 | 124 |
| f0c6 | bafd8b412e0d32cd | 11 | -55 | 148 |

[jwhui]

@BAzili073 , do you have any nRF52840-DK or USB dongles to test with? It would be interesting to see if you can replicate the issue with Nordic dev boards.

[BAzili073]

Yeah, we will try to reproduce it on nRF52840-DK

[jwhui]

Closing stale issue.