IKEA Starkvind’s “off” PM 2.5 value is reported as max value

[raidenlal]

Does the issue really belong here?

• I definitively want to report a bug within deCONZ or its REST-API

Is there already an existing issue for this?

• I have searched the existing issues and there is none for the bug at hand

Describe the bug

When Starkvind turn’s off or turn’s on or when there is no actual reading available it reports “65535” value instead of not reporting any values.

Workaround I am using atm is Home Assistants template (excerpt):

          {% set current = states('sensor.air_purifier_pm25') | float(none) %}
          {% if current < 65535 %}
            {{ current }}
          {% else %}

But obviously this should not be needed and no value should be reported and because of this it is a bug.

Steps to reproduce the behavior

1. Pair Starkvind
2. Turn it off or plug it out of mains power
3. Turn it back on again or plug it back to mains
4. Observe 65535 micrograms per cubic meter of particles smaller than 2.5 micrometers in diameter

Expected behavior

No value is reported when no real measurement was done. No measurement = no measurement.

Screenshots

No response

Environment

• Host system: RPi
• Running method: Home Assistent deCONZ Add-on
• Firmware version: 26720700
• deCONZ version (not Home assistant Addon version!): 2.28.1
• Device: ConBee II
• Do you use an USB extension cable: no -- only relevant for ConBee I/II/III
• Is there any other USB or serial devices connected to the host system? If so: zwave stick

deCONZ Logs

No response

Additional context

No response