Coap 1 0 7

[Cyber1000]

This adds coap-functionality for newer devices as described here: #35

Limitations:

• Some devices send mutliple coap-messages for one device, these are cut off and information cannot be decrypted (For now users are getting: "Message from device got corrupted"). Known devices:
  • AC2729/50
  • AC3039/10
• At least one device-type can't set aqil 0 or uil 0. Known device:
  • AC3033/10
• Sometimes if you are too fast between two commands, the second command isn't executed. (Solution for now, wait at least 5s) Known devices:
  • AC2889/10

I'll try to get some information how to fix the limitations, best chances are for AC2889/10 (since I own this device), others will be difficult to test ...

Additional info:

• I added the "aqit" from #12 - I translated it with "Air quality notification threshold", since that's what it is, a treshold for the app notification

[rgerganov]

Thanks a lot for your work! I did a quick test with my purifier which works with HTTP and didn't find regressions, so I am going to merge this. Further PRs for cleaning the code or adding known issues to the README are also welcome :)