Incompatibility with firmware version 1.8.0
The latest firmware update (version 1.8.0) contains some breaking changes to the CoAP API that this plugin uses. These changes will make Shelly devices running the latest firmware work poorly or not at all with this plugin. I had only two days notice of these changes and have not had any time to implement support for the new API yet. So if you need to use homebridge, your best option is to stay with the 1.7.x firmware for now.