This is what I understand and how I got device groups to work as remote controls of 3 different multi button devices. With each button controlling other device relays or its own relays.
remotely controlled and show status of remote devices on both button LED and in homeassistant.
DevGroupName kitchen {“DevGroupName1”:“kitchen”,“DevGroupName2”:"",“DevGroupName3”:“bedroom”,“DevGroupName4”:""}
SetOption85 1
So88 1
Kitchen Two button TX Kitchen switch.
Button1 (relay1 wired to kitchen light)
DevGroupTie1 2
This ties kitchen switch button1/relay1 (Kitchen light) to button2 of the (office switch) in the kitchen Device group. If office switch button2 or kitchen button1/relay1 is pressed, kitchen relay1 will toggle kitchen light. Both switches assigned button LED show status of kitchen relay1 and in Homeassistant.
Kitchen switch Button2 (nothing wired to relay).
DevGroupTie2 1
This ties button1/relay1 (garage light) to button2 (kitchen switch).
The kitchen Device will toggle the button1/relay1 of the garage switch light.
If garage switch button1/relay1 or kitchen switch button2 is pressed, garage relay1 will toggle garage light. Both switches assigned button LED show status of garage relay1 and in Homeassistant.
Office Two button TX office switch
Button1 (relay1 wired to office light) ( will only toggle locally wired office light)
DevGroupTie1 0
no other remote action or controlled by other devices
Office Button2 (nothing wired to relay).
DevGroupTie2 2
This ties button1/relay1 (kitchen light) to button2 (office switch).
The Office Device will toggle the button1/relay1 (kitchen light) of the Kitchen switch .
If the Kitchen switch button1/relay1 or Office switch button2 is pressed, Kitchen relay1 will toggle Kitchen light. Both switches assigned button LED show status of Kitchen relay1 in the devices and in Homeassistant.
Garage
Three button TX Garage switch
Button1 (relay1 wired to Garage light)
DevGroupTie1 1
This ties Garage switch button1/relay1 (garage light) to button2 of the (kitchen switch) in the kitchen Device group. If kitchen switch button2 or Garage button1/relay1 is pressed, Garage relay1 will toggle Garage light. Both switches assigned button LED show status of Garage relay1 and in Homeassistant.
Button2 (relay wired to Driveway light) ( will only toggle locally wired Driveway light)
DevGroupTie1 0
no other remote action or controlled by other devices
Button 3 not wired future garage door opener
DevGroupTie1 0
no other remote action or controlled by other devices
video of test switch https://photos.app.goo.gl/zN5atNCVx8MXsbqg8
I have several other switches I have been using tasmota rules to do the same thing but rules do no show status of the other devices on the remote switches.
here is my write up with many photos and info.
remote multi button switches with rules