Notes on firmware 16.0beta1:

With the Matter protocol, the Shelly 2 PM G3 device is highly unstable. It causes interference with the Wi-Fi network, constantly connecting and disconnecting from it, even disrupting the connection of nearby Shelly devices due to this interference. This issue does not occur with Shelly 1 Mini Gen 3 devices, which work perfectly.

When using Matter, the Shelly 2 PM G3 is recognized by HomeKit only as a dual switch, not as a shutter or blind controller. While it appears to be integrated, the control buttons are completely unresponsive—so it doesn't actually work. Furthermore, it doesn’t integrate with other Matter networks like Aqara’s, which can integrate devices from other Matter-compatible brands.

If you attempt the initial pairing on an Aqara network, it accepts the pairing code and Shelly shows the device as paired. At first it seems to work, but Aqara fails to complete the pairing and ultimately doesn't recognize the device. This might be an Aqara issue, but it also seems to be a problem on Shelly’s end: once it considers the device "paired," it won’t provide the pairing code again—not even after a factory reset or reinstalling firmware version 16.0beta1. The device neither stores nor shows the pairing code again. It only prompts you to pair through the already-linked platform, even when it's not actually paired.

Therefore, the first integration must always be done through HomeKit before attempting to add the device to any other platform.

It’s strange, because with the Shelly 1 Mini Gen 3, you can first integrate it with Aqara, and then add it to HomeKit, Home Assistant, or any other platform in whatever order you prefer.

Saludos:

I believe the folks at Shelly are making a mistake here. More than half of all installed Shelly 2 PM G3 devices are used to control blinds, and very few users rely on scripts to operate them.

Improving compatibility would make the device truly versatile, and it would undoubtedly become the best blind control relay on the market. Replacing them with the Shelly 2 PM G4, once released, is neither economically nor operationally viable. This would simply open the door for other manufacturers to step in with competing products over time.

In any case, I think Shelly needs to seriously reconsider the Matter compatibility of the Shelly 2 PM G3—because right now, it doesn’t function properly as a blind controller, nor as a switch, and it doesn’t integrate with other Matter-based systems.