Hello Thank you @tom_l for your prompt response as always
Here is a copy of one of the error messages for a light fixture
all other 3 messages are the same with the exception of the ip address of the device
"Shelly device Entrance Hall Light push update failure
Home Assistant is not receiving push updates from the Shelly device Entrance Hall Light with IP address 192.168.1.79. Check the CoIoT configuration in the web panel of the device and your network configuration."
The Home assistant forum says this
" Generation 1 devices use the CoIoT protocol to communicate with the integration. For Shelly firmware 1.10.0 or newer, CoIoT must be enabled in the device settings. Navigate to the local IP address of your Shelly device, Internet & Security >> ADVANCED - DEVELOPER SETTINGS and check the box Enable CoIoT ."
I did check this and the ColoT is enabled and the Colot is set to mcast
These devices were installed at the beginning of last year and i never had this issue before