Improve gateway sorting algorithm in NS

[johanstokking]

Summary:

Gateway sorting algorithm in NS can be improved

Why do we need this?

To make better gateway choices

What is already there? What do you see now?

A very simplistic gateway sorting algorithm

What is missing? What do you want to see?

A more efficient gateway sorting algorithm

How do you propose to implement this?

Based on experience with v2:

• SNR isn't the only metric; RSSI is also important.
• We may need to filter "incorrect data" (SNR=0, RSSI=0 for example)
• We may want to include gateway uplink utilization to avoid Tx on "valuable uplink gateways"
• We may want to include gateway downlink utilization to be a little bit smarter about downlink gtw selection than always selecting one with a full duty cycle
• We may benefit from a little bit of randomness

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Original issue: https://github.com/TheThingsIndustries/lorawan-stack/issues/729 by @rvolosatovs

[johanstokking]

Prioritize gateway sources over Packet Broker

[nejraselimovic]

Prioritize gateway sources over Packet Broker

@johanstokking is this implemented in the meantime by any chance? Looks like an important issue.

[johanstokking]

I don't think this is fully implemented. I'll reschedule for Q3 to revisit.