OpenThread Reconnection Max Count

Nikhil Komalan

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Jul 19, 2021, 4:33:11 AM7/19/21

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Hello,

I would like to know, when a FTD device disconnects from a network how many times it will try to reconnect to a previous network it was connected to.

And how i can increase the retry count for the same.

Jonathan Hui

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Jul 19, 2021, 6:22:43 PM7/19/21

to Nikhil Komalan, openthread-users

An OpenThread device is generally configured to attach to only a single network (i.e. it stores a single Operational Dataset). As a result, a Thread device will always attempt to attach to the same Thread network.

If by "network" you meant "partition", a router-capable device will attempt to attach to the same partition twice (by sending MLE Parent Request messages) before looking for any other partition - see src/core/thread/mle.cpp. This is currently defined by Thread specification, so no this is not currently configurable.

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Jonathan Hui

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Nikhil Komalan

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Jul 19, 2021, 9:35:56 PM7/19/21

to Jonathan Hui, openthread-users

Okay thanks for clarification.

Yeah I was talking about partition in above query. So what can I do on application level if my one FTD device isn't able to reconnect to a thread partition.

If I turn my device into MTD and turn on the parent search feature (child supervision) where parent are periodically searched after some period of time. Will this be helpful.

Jonathan Hui

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Jul 20, 2021, 1:51:01 AM7/20/21

to Nikhil Komalan, openthread-users

Router-capable Thread devices continuously look for partitions to merge by sending MLE Advertisement messages. If two router-capable devices in different partitions are able to communicate with each other, they will eventually merge into a single partition.

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Jonathan Hui

Nikhil Komalan

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Jul 20, 2021, 5:48:48 AM7/20/21

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Have you came across any issue were FTD device isn't able to rejoin or just gets disconnected after few hours 17-18 hours of running. The issue I'm talking about doesn't happen all times but sometimes it does happen.

I would like to know what can be the possible reason a device gets disconnected even if they aren't moved. Can it happen ?

I flashed 2ftds with same example, one was able to run till it's battery went off and another device just ran for 16-17 hours. Also the device which served it's battery period was far in distance compared to the device that went off.

Jonathan Hui

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Jul 21, 2021, 12:06:15 AM7/21/21

to Nikhil Komalan, openthread-users

As I've previously mentioned, radio driver issues failing to send/receive messages is a likely cause.

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Jonathan Hui

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Nikhil Komalan

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Jul 21, 2021, 2:28:33 AM7/21/21

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Okay thanks i have reported the issue again. Hopefully they will help.

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