For reference, Shelly (the company) has now joined the ”Works with Home Assistant” (WWHA) partner certification program but so far they have only certified their Z-Wave devices and there is unfortunatly no mention if certification for Zigbee devices is also planned or not:
FYI, as I understand it, the agrement guidelines for that ”Works with Home Assistant” partner certification program stipulate that the company wanting to certify Zigbee devices for WWHA is more or less required to provide standard Zigbee OTA firmware updates nativly via Home Assistant’s built-in ZHA integration for certified Zigbee devices for standaized sustainability with support for local updates, and the devices themself also needs to have Zigbee CSA Certification as well.
Quote:
Available to access firmware updates directly in Home Assistant
Ideally, all devices should be able to access over-the-air (OTA) firmware updates from within our system. If this isn’t possible, you must provide a way to alert users about firmware updates.