The node resets on connection negotiation timer timeout

RE: The node resets on connection negotiation timer timeout

Karl Ylvisaker — Mon, 07 Sep 2020 07:07:18 GMT

[quote user="hardikp"]The reset issue occurrence frequency very low. We hardly get it 2 3 times per day. We will put the system in debug mode and will share the result.[/quote]

It will be much easier to investigate the cause when we see the logs for the occurrence with debug enabled. Great!
It seems strange that you only see this 2-3 times a day, if it indeed is a disconnect due to connection parameter negotiation mismatch.

[quote user="hardikp"]We are using the nRF52840 module on the central side and similar ble_app_uart_c example code. So it should support the minimum and maximum connection intervals as mentioned above. [/quote]

Could you verify for me whether you are using an unmodified ble_app_uart_c example on your central side?
Could you also share with me the exact MIN_ and MAX_ connection interval specified for your central?
The default supported connection interval for the ble_app_uart_c is 7.5 - 30 ms ( which has some overlap with your peripheral device ).
Is your central connected to multiple peripheral devices at the same time?

Best regards,
Karl

RE: The node resets on connection negotiation timer timeout

hardikp — Mon, 07 Sep 2020 06:46:45 GMT

[quote userid="87869" url="~/f/nordic-q-a/65531/the-node-resets-on-connection-negotiation-timer-timeout/267825"]Which function is returning the error?[/quote]

The reset issue occurrence frequency very low. We hardly get it 2 3 times per day. We will put the system in debug mode and will share the result.

[quote userid="87869" url="~/f/nordic-q-a/65531/the-node-resets-on-connection-negotiation-timer-timeout/267825"]do you know what interval your central supports?[/quote]

We are using the nRF52840 module on the central side and similar ble_app_uart_c example code. So it should support the minimum and maximum connection intervals as mentioned above.

RE: The node resets on connection negotiation timer timeout

Karl Ylvisaker — Thu, 03 Sep 2020 12:01:10 GMT

Hello,

As @Awneil says, it would be helpful if you could narrow down the problem, perhaps with the logs of your application or central side.

[quote user=""]it throws the invalid state error (0x08) and causes the software reset.[/quote]

Which function is returning the error?
If you define DEBUG in your preprocessor defines, as shown in the included image, then you may see the exact error generated, if an error is passed to APP_ERROR_CHECK.

[quote user=""]Is it ok to increase the FIRST_CONN_PARAMS_UPDATE_DELAY from 5 seconds to 8 seconds?[/quote]

Yes. The FIRST_CONN_PARAMS_UPDATE_DELAY determines how long the peripheral will wait before initiating an update of the connection parameters, if the connection parameters of the central is outside of the specified peripheral's parameters. You are currently using MIN_ 20, MAX_ 60, do you know what interval your central supports?

Best regards,
Karl

RE: The node resets on connection negotiation timer timeout

awneil — Thu, 03 Sep 2020 10:41:19 GMT

Have you tried adding some debug logs and/or using the debugger to see exactly what is happening?