No idea on a visual countdown, but I do have a working audio countdown.
Using the Fully Kiosk Browser, the Fully Kiosk Browser Device (FKBC), and SSML
My SSML. Note it's not always 100% accurate due to network and device timing, but it's usually close enough. Hubitat does not allow HTML like characters to be entered in text fields the {} are converted by the FKBC app to <>.
{speak}Alarm system is arming in 30 seconds, please exit the facility. {break time="1s"/} 25 seconds{break time="2800ms"/}20 seconds{break time="2800ms"/}15 seconds{break time="2800ms"/}10 seconds{break time="2800ms"/}5{break time="700ms"/}4{break time="700ms"/}3{break time="700ms"/}2{break time="700ms"/}1{/speak}
The Beep
Load an MP3 file of your choice onto the dashboard device, then play using the Beep or Chime command in the FKBC device.
PS I'm using my Nyckelharpa app to generate the beep and TTS, however it could easily be accomplished with RM
