Add adsb exchange feeder and mlat

[garethhowell]

This change adds two new services to send data from dump1090-fa to adsbexchange.com

• adsbexchange-feed and
• adsbexchange-mlat

Strictly speaking, adsbexchange-mlat's services could be provided using the pre-existing mlat-client service.

[ketilmo]

Hi @garethhowell,

Thanks a lot for contributing to the balena ADS-B project! That's highly appreciated. I will have a look at your pull request as soon as possible and come back to you. Thanks again!

Ketil

[ketilmo]

Hi @garethhowell,

Thanks for submitting a fully functional implementation of the ADSB Exchange feeder. I have reviewed your pull request, and it looks good.

I have made a few slight changes:

• I have changed the variable ADSBEXCHANGE_RECEIVER_NAME to ADSB_EXCHANGE_SITENAME to ensure future compatibility with some ongoing implementation work.
• I have added a variable called ADSB_EXCHANGE_UUID for seamless future addition of ADSB Exchange's statistics package.
• I have added scripts for generating a legal site name and a proper UUID (see readme).

That's it! Your pull request is good to go.

Thanks again for your efforts! Good work!

Kind regards,
Ketil