[feature request] Allow selection of starting gain in autogain

[andreagdipaolo]

I believe it could be useful to let the user select a starting gain in autogain.
In my current setup if I use autogain the system defaults at 49.6 and signals are so strong that they are detected as noise and I get something like 0,1% of what I would get with optimal gain.
I figured that the best gain for me is about 12-18.
I would still like to have autogain active in order to adjust for the environment etc etc, but that would be useful only if I could start at around 15 in order to get signals and make it work.

[mclueppers]

This is already possible via environment variables.

Set in your .env file:

READSB_GAIN=autogain
READSB_AUTOGAIN_INITIAL_GAIN=15

and restart the container

[andreagdipaolo]

Thanks, I had already solved that.
There is no reference about that string in the readme.
Anyway the script didn't work properly and @kx1t fixed it.
Thanks!