Add the "battery" key to the home-assistant MQTT script

[triplepoint]

The Inkbird sensor in src/devices/inkbird_ith20r.c reports "battery", but it doesn't exist in the MQTT field mapping in examples/rtl_433_mqtt_hass.py. This PR fills in that field mapping.

[gdt]

Your commits could use squashing or rebasing, it looks like from the messages. That's just me; other people are fine with that happening on merge.

If this is the first battery, I think it's important to figure out how to align rtl_433s's ideas of battery and HA's, so that these are well-behaved battery entities when they land. Perhaps you did that and I'll have a look. Historically there have been multiple kinds of representations in rtl_433, much more cleaned up now.

[merbanan]

Why not change inkbird_ith20r.c instead ? I think that is the correct change to do.

[zuckschwerdt]

Yes, please fix inkbird_ith20r.c (you can reuse this PR if you like). I don't know how this slipped through the key needs to be battery_ok (https://triq.org/rtl_433/DATA_FORMAT.html#common-device-data) and the range is 0–1, I think here we need to divide by 100.0?

Also mic needs to be the last key. Shuffle that down in both data_make() and output_fields.

[triplepoint]

ok, let's abandon this PR in favor of this one #2596