Load multiple frames at once and universal support for to_JSON in frames

[blagasz]

I needed to load multiple frames at once for an mbus project over tcp, so I wanted to add support for it. Hope I found a good way to integrate it with the current code.

I also added to_JSON for all the frame types except for WTelegramSndNr.

If you have any suggestions I am happy to (try to) implement them.

[codecov[bot]]

Codecov Report

Merging #14 into master will decrease coverage by 1.32%. The diff coverage is 50.98%.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
- Coverage   79.64%   78.32%   -1.33%     
==========================================
  Files          20       20              
  Lines        1538     1578      +40     
==========================================
+ Hits         1225     1236      +11     
- Misses        313      342      +29

Impacted Files	Coverage Δ
meterbus/telegram_header.py	100% <ø> (ø)	:arrow_up:
meterbus/telegram_body.py	84.3% <100%> (ø)	:arrow_up:
meterbus/telegram_short.py	96% <100%> (+0.08%)	:arrow_up:
meterbus/telegram_long.py	68.14% <100%> (-0.05%)	:arrow_down:
meterbus/__init__.py	69.11% <40%> (-30.89%)	:arrow_down:
meterbus/telegram_ack.py	81.81% <60%> (-6.42%)	:arrow_down:
meterbus/telegram_control.py	96.55% <60%> (-3.45%)	:arrow_down:
meterbus/exceptions.py	93.75% <0%> (-6.25%)	:arrow_down:
meterbus/serial.py	97.87% <0%> (-2.13%)	:arrow_down:

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[ganehag]

I haven't had any time to review it yet. I will do it in the coming days.

[blagasz]

Ok, no worries. I was wondering if a more efficient internal representation of the telegram objects could be implemented with the help of numpy. Based on this https://www.numpy.org/devdocs/reference/arrays.dtypes.html#specifying-and-constructing-data-types I would say it is worth considering.

[blagasz]

Encountered a rare error in parse. If my manufacturer specific TelegramLong message has a certain length, then it is parsed as WTelegramSndNr accidentally when parse tries different types.