Energy scanning improvements

[puddly]

The maximum-seen LQI is suspiciously 85, which is exactly 255 / 3, even with a EFR32 stick nearby performing a tone test at +20dBm.

For zigpy/zigpy#1183

[MattWestb]

Then i was running RasBee with deCONZ i was having the impression that the coordinator is very dominant and was making end devices using it as parent.
But my feeling was that it was asymmetric = RX and TX links was not the same so one end device can hearing the coordinator but the coordinator was not hearing the end device good. The best is having it balanced so the link is working good and the device can getting one true fact then shushing its parent.

Also the old IKEA Zigbee module (EFR32MG1P) was having +19 dBm and the new Silabs is only 16 dBm but i think the link symmetric is better.

Silabs have one test paper with routers and end device explaining how its working in real with sleeping end device that is using 1/10 or power and and routers covering for getting them retching out from "radio clouds" but i cant finding it for the moment but is abut radio performance in Zigbee mesh networks.

[codecov-commenter]

Codecov Report

Patch coverage: 33.33% and project coverage change: -0.19 ⚠️

Comparison is base (80041b9) 98.00% compared to head (1b788a6) 97.82%.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #216      +/-   ##
==========================================
- Coverage   98.00%   97.82%   -0.19%     
==========================================
  Files           6        7       +1     
  Lines        1003     1011       +8     
==========================================
+ Hits          983      989       +6     
- Misses         20       22       +2     

Impacted Files	Coverage Δ
zigpy_deconz/zigbee/application.py	98.07% <33.33%> (-0.63%)	⬇️

... and 1 file with indirect coverage changes

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.