This post is older than 2 years and might not be relevant anymore
More Info: Consider searching for newer posts

IV Index update LPN

Hello,

What happens with the LPN firmware if it currently has an IV index of 0 and loses power for an extended period of time. When it gets power, the network that it is on has move all the way to IV index 2.

Will it be able to get a friend?

Will the friend be able to update the IV index of the LPN to 2?

Can the LPNs do an IV index recovery procedure like normal mesh nodes can?

Parents
  • Hi Brad, 
    Please have a look at section 3.10.6 IV Index Recovery procedure in the spec: 

    The Low Power Node if losing IV index update would need to listen for at least 5 seconds to catch the Secure Network Beacon. If it couldn't listen for such long, it should wake up at least once per 96 hours to get the update from the friend before the IV Update procedure finished. 

  • Thanks for the response.

    So what does the current LPN example do?

    Does it listen for a beacon or does it rely on a friend to update it?

    I tested with the example LPN and if it currently has an IV index of 0 it is not able to establish a friendship with any device that has an IV index greater than 1. This means it will never get the IV index update and no longer be able to communicate with devices on the network if it misses 2 IV index updates. 

Reply
  • Thanks for the response.

    So what does the current LPN example do?

    Does it listen for a beacon or does it rely on a friend to update it?

    I tested with the example LPN and if it currently has an IV index of 0 it is not able to establish a friendship with any device that has an IV index greater than 1. This means it will never get the IV index update and no longer be able to communicate with devices on the network if it misses 2 IV index updates. 

Children
Related