MQTT improvements

[Radu-nic]

Hi guys - this is my first contribution ever on GutHub ;) so ... be gentle with me :D. I love this project!!! Great job!

I have used mqtt connection and i've found that something must be fix and other things should be nice to have so ...

MQTT improvements:

• may change settings live, reading a persistent mqtt message with the same structure as the one saved in FS. The topic read is "ispindel/<>/settings". Every option saved into persistent local settings may be changed, but POLY and Sleep was those of maximum interest. After reading this new settings message this will be erase.
• sent to mqtt broker an json report containing all readings on report topic This was useful for future writing to a log file or in my case to a database

MQTT fix:

• fix on sending mqtt messages without user/password. If you do not set a username or password some mqtt brokers don't accept the message sending empty user&password
• do not try send message if not connected after 3 retries.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[universam1]

Nice work!
I’d like the remote configuration feature being optional which is disabled by default.
Reason it that it has a direct penalty on the runtime hence battery lifetime and that is why someone must be aware of that when enabling this option.
Sorry for the delay @Radu-nic there were conflicting PR arriving

[Radu-nic]

Hi Samuel.
I'm glad you had time to take a look at those changes and that you liked my work. I saw you fixed the issue sending mqtt message without connection, great! You do have right indeed about extra processing on "settings change" message. I will change the code to trigger this only when needed. Also I am trying to update my fork to master or cherry-pick your commits but ... no success. I will revert my branch and rewrite the changes.
So i suggest we abandon (delete) this pull request for the moment, don't know how to do it, i'm sure you do ;).
"I'll be back"

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.