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Understanding link quality amongst various routers in the network

Folks,

I have a network of all routers hopping their data over to each other and sending it finally to a concentrator. Just reading RSSI/LQI on the concentrator doesn't help me as it always will give me LQI of the last hop (to the concentrator). How can I know how LQI looks like across all the hops?

Would finding GetNextHop() and finding lqi of that next hop in current router node work reliably? That is how I can actually build the link quality over entire chain right? Any other better solution?

I have implemented above solution and may be it is working but after some time LQI gets stuck at one specific value/doesn't vary much.