add a way to poweroff the battery with Go dexcom libraries

[PieterGit]

The dexcom_reader had support to read and write the battery charging. This can be used to stop the charging with udev. See https://github.com/PieterGit/dexcom_reader/blob/master/dexcom_reader/bat.py for an example with the dexcom_reader.

Can you please implement this in the Go libraries?

[PieterGit]

I will have a look if I can manage it with the opcodes 59 and 60, as @ecc1 suggests in https://gitter.im/openaps/oref0?at=5b789f98dd0b74601e281556