Hello, I search for a decent solution to get instant camera stream on mobile devices on HA sensor state change. Instant is the key word here and that means WebRTC streams. 
Basically the scenario is this - someone rings the bell (or perimeter security alarm is triggered) and my phone rings/beeps with the real-time camera stream at a tap away.
I’ve tested doing that using Slack notifications, iOS companion app, etc. Nothing really works. I’m open for any ideas, including exotic ones.