@grumpazoid I get this a lot here. In MyController I can see the data each time it is sent. It seems that you are only seeing data when a change occurs. Perhaps there is a setting somewhere? I don't use Domoticz.
I notice that my sensors nodes can just stop sending data. Sometimes it stops until I reboot the node, sometimes it just seems to not send for a period of time ranging from minutes to many hours and then starts sending again all by itself.
I have tried sending heartbeat at regular intervals and then replaced heartbeat by having the node just send its status reglardless of whether or not it has changed. Neither of these approaches have worked for me. So far I have failed to get any further than this.
If you want to detect jamming, then can I suggest a jam detection node dedicated to this task. There is more than one approach to jamming detection.
If you are using the nrf24 modules, they are capable of frequency hopping which gives resilience to jamming to a large degree, but I don't believe this function is supported by my sensors.