I have now equipped the entire house with Bosch BSD-2 smoke detectors and integrated them into homeassistant with zigbee2mqtt.
I am now wondering if there is a way for the smoke detectors to communicate an alarm with each other so all of them beep. If there is a fire in the basement, for example, you should hear it throughout the whole house and all the detectors should beep.
I would prefer it if this function existed independently and if not, what is the best way to implement this in homeassistant? In the z2m docs for BSD-2 there is the broadcast alarm enum which is described as follows “Set siren state of all BSD-2 via broadcast” but if I change this value on one BSD-2 nothing happens.