Add support for accelerometer axes in Samsung Smartthings Multipurpose Sensor (F-MLT-US-2)

[declanshanaghy]

See: Koenkk/zigbee2mqtt#6021

[declanshanaghy]

This works fine but it has an odd quirk that I'd like to resolve before merging. If any of the axes values haven't changed then that attribute is not included in the next MQTT publish, this causes a value of 0 to show up in Home Assistant for that axis.

It would be preferable to publish the last value each time.

[declanshanaghy]

Where can I augment the HA MQTT discovery data that's published for this?
I'd at least like to set the unit_of_measurement properly.
Probably a few others too.

See: https://photos.app.goo.gl/uSSoQkHyAHTDgZ8c6

[Koenkk]

unit_of_measurement

You can fill in the withUnit() part here: https://github.com/Koenkk/zigbee-herdsman-converters/pull/2260/files#diff-d0e9d08b90d447f440404af9227490f81b63e0d3a02ebd8235023c8b1ec72d47R518

[declanshanaghy]

unit_of_measurement

You can fill in the withUnit() part here: https://github.com/Koenkk/zigbee-herdsman-converters/pull/2260/files#diff-d0e9d08b90d447f440404af9227490f81b63e0d3a02ebd8235023c8b1ec72d47R518

Ahh ya. I found that. But setting it to '' caused the check in zigbee2mqtt to fallback on '-' anyway. So I opened another MR to handle that case.