Right. So I'm getting a little pissed off now.
This evening, everything I tried worked. I was happy it did. Then, about a half an hour ago, my modem lost it's connection. Everything lost it's connection, including Hubitat. I rebooted the modem. It got online. I could not receive Hubitat anymore. I rebooted hubitat, and ofcourse it received a different IP.
I openend the app, and could not reach the dashboard anymore. That referred to an (internal) ip adress that was no longer valid. Only option I could think of was to log out of the app, and log in again.
Did so, dashboard was back, but, it also added a new device, being a second phone. The same issue I had at the beginning of this topic. Right. So I removed that 2nd phone. Checked if my original device was still there, and it was. Great. Dashboard worked again. Great. Then I tested my door sensor.
NOTHING. It registers as being opened/closed, I can see that in the dashboard, but the notification does not arrive at my phone anymore. Yes, I removed the SECOND (newly added) device, so the original device, the one that is used in the rule for the notification is still there.
However, my phone does not receive it. I'm kind of getting tired of this. I recreated the rule. I did everything exactly the same. No notification. Why?!
Edit: I went downstairs to let the dog out. I'm standing there, suddenly my phone starts vibrating like crazy. All the sensor-notifications are suddenly pouring in. I don't know how or why, but it did. It was connected to WIFI the whole time, so also wenn I was NOT receiving them.
I just now went upstairs again to test the sensor. It works like it should?! don't understand this at all. Anyway, it's the middle of the night here at the moment, so let me get some sleep and try to figure this out tomorrow.