I had some issues with Dnpwwo's plugin that was located on my side. When I sent one notification it worked perfectly. But when trying to send another one right after that, it didn't play instantly. It could play a few minutes later. In my home network I have an USG (Unifi Security Gateway) with IPS ...

@Frelinde, Either the beta version of Domoticz is not update to date enough or pychromecast is not installed in line with the instructions. I would suggest moving to the current beta and executing sudo pip3 install pychromecast just to be sure. Thanks. My Domoticz version was to low. After updating ...

There are a number of Chromecast/Home plugins if this one is not doing what you want. Mine is here: https://github.com/dnpwwo/Domoticz-Google-Plugin but I believe other users have created some as well. mine doesn't use user variables at all but does handle notificatons from scripts or devices ...