Rpi Rfx433 not working with Domoticz

[rickybee]

I have a working Domoticz setup on a Raspberry Pi B+ with a MySensors serial controller. I wanted to add rfx433 capability to control some Etekcity remote outlets. I used the instructions from this https://timleland.com/wireless-power-outlets/ to get it working. And it does work from the command line on the Raspi. However, if I start Domoticz it no longer functions. If I stop the Domoticz service then it works again.
Any ideas on how I get the two working at the same time?