Stable release (passing automatic tests on HA core 2025.8.0) with latest fixes and features.
These lists include features and fixes already brought trough in recent alpha/preview releases.

features

• added support for mts300
• added support for 'Hold action' to the mts line of thermostats (mts200, mts300)
• added support for setting the display temperature unit in thermostat devices
• implemented buttons for smoke alarm muting and testing (#544)
• added support for new msl320cpr 'light.effect' message/payload (#566)
• minor improvements on trace/diagnostics data to expose more consistent informations.
• added 'Repair' for dangling Meross Hub subdevices left in HA registry after the subdevice itself has been unregistered from the Hub (#575)

fixes

• fixed the temperature 'stepping' in climates when system units are set °F
• fixed query format to get initial sensor state in ms600 (#517)
• fixed a minor bug in HTTP encryption (maybe influencing #472 #564)
• fixed Refoss (em06 and others) status querying (#574)
• fixed some issues in MQTT device configuration and behavior trying to fix #562

Not sure if any of these have been fixed but this update could bring some good news for these:

• #305
• #472, #564
  Please update and report those if the update gives some good news ;)

Full Changelog: v5.5.0...v5.6.0