Emergency buttons

[k8gg]

@ChewbaccaBG

The buttons I’ve chosen are powered by a 12V battery

Is there any link or photo or make/model?
Purely out of curiosity.

[Hellis81]

@ChewbaccaBG

Additionally - Is it possible for all buttons to write to the same “topic” - only the number of the room (that will be unique for each button), and have the subscriber (reader) get all the various room numbers (if more than 1 button was pressed) ?

If it’s 433 MHz then no.
The receiver can do it but not the actual button.
You can see what hub that sent the message, but not what button.

[ChewbaccaBG]

The buttons are KERUI Doorbell button F52 Waterproof Wireless Touch Smart Receiver Home Gate Security Doorbell panic SOS Emergency button|Emergency Alarm Button| - AliExpress

For HUB I plan to use a Sonoff one with tasmota firmware - get the RF signal from button → transfer via MQTT to HA.