TODOS (at least):
* revisit the stupid timing stuff, still does not read data reliably
* validate return code and checksums
* use address to support multiple packs
* read and populate alarm data
* cleanup logging
* calculate real checksums instead of hard wired for one command

* fixes serial reading from Seplos by simply using readline()
* validates checksums, return codes
* clean up logging
* proper encoding of arbitrary cid2 commands including address, length and checksums

Still TODO:
* read alarm data

The template is already reworked in another PR.

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