Clean up telemetry and add option(s) to www interface (TTGO T-beam v.1.0 )

[mattbk]

TTGO T-beam v.1.0 changes only.

The point of this is to clean up the telemetry information and give some control over it from the www interface. See also #59. Added numeric telemetry sequence rather than MIC by default.

• [x] telementry enable in www
• [x] telemetry interval in www
• [x] add www option for MIC telemetry rather than sequence
• [x] bug: sequence is not getting saved between reboots
• [x] notify when sending telemetry (blink and/or screen)
  • [x] screen
  • [x] flash LED
• [x] work with IS websites?
  • [x] aprs.fi (with T# sequence, not MIC)
  • [x] aprsdirect.com (with T# sequence, not MIC)
  • [x] do they show the same data?

Potential future work (not in this PR):

• choose which self telemetry values to send in www
• allow separate telemetry path in www

I will fill this in from my work at https://github.com/mattbk/TTGO-T-Beam-LoRa-APRS/pull/2, I didn't make the PR right in the first place.

[iu2frl]

I might just suggest to add few comments to get better understanding of functions

[mattbk]

Nice intro to preference storage: https://randomnerdtutorials.com/esp32-save-data-permanently-preferences/

[mattbk]

aprs.fi

• B Volt
• B In
• B Out
• AC V
• AC C

aprsdirect.com

• B Volt
• B In
• B Out
• AC V
• AC C

Values match each other.

[mattbk]

Factory reset causing constant telemetry send, trying to fix.

Telemetry not resetting to 0 after 999.

[mattbk]

OK, now it's ready for someone to look at or test.

[SQ9MDD]

for TTGO 1.0 everything is ok but other versions do not compile. Will you check it?

[mattbk]

Yes, will try.

[SQ9MDD]

Oh... and Matt please add your call sign to the contributors at the bottom of the page. I would add myself but I don't know him

[SQ9MDD]

I'm thinking of a separate path for telemetry see: https://github.com/SQ9MDD/TTGO-T-Beam-LoRa-APRS/issues/77