nRF BLE MESH light switch server fails after a period

[Honey]

Hi,

We are running a setup that pumps sensor data from light switch server to light switch client. After provisioning/configuration the setup is working fine without any issue. After some random period(may be 1 or 2 days) light switch server comes out of network and not going back to mesh. It is able to connect to that node using nrf mesh android app and read or write parameters but not able to access other nodes through this failed node(because of not in mesh). We are using nrf5SDKforMeshv310src and nRF52840 chip.

Is it a bug in the SDK or flash corruption due to power failure? How can we resolve this problem?

Regards

Honey

[Joakim Jakobsen]

Hi!

Do you know if there is a particular reason that the device is leaving the network? You mention power failure in your last sentence.

Have you had the chance to debug your device as when the device leaves the network? Are you getting any errors or similar?

Regards,
Joakim

[Honey]

Hi joakim,

The reason for leaving the network is completely unknown. Power failure is just an assumption.

I spend time to debug the device.It's not showing any error. I could connect it with nRF Mesh App. But it is not participating in the mesh network.

Regards

Honey

[Joakim Jakobsen]

That sounds strange.

When you reconnect to the node using the nRF Mesh application, do you connect to it as a node still part of the mesh network? Or is the node advertising as an unprovisioned node?

Br,
Joakim

[Honey]

Hi Joakim,

It is advertising as provisioned node. Still part of the mesh network.

Regards

Honey

[Joakim Jakobsen]

Hi. 

I tried reproducing the issue running the standard Light switch example from the nRF5 SDK for Mesh v.3.1.0 for a couple of days, but without luck. 

Have you made any major changes to the application or the mesh stack?
Is it possible for you to test using the latest version of the nRF5 SDK for Mesh (v.3.2.0)?

It might be that the IV index was not updated, causing the device to not being able to communicate with the network.