As is probably known to most of you, Domoticz sends a PS=1 command to the OTG.
But how do you deal with that?
It took me a lot of time before I found out that the reason was that every time the data flow came to a stop.
How do you solve this problem?
I assume you have an OTGW module installed. How is it connected to Domoticz?
The OTGW hardware module in Domoticz is able to talk to your OTGW and is able to handle the response from the PS=1 command it sent.
Recently a new firmware version (5) has become available for the OTGW that has a slightly different PS=1 output, but the latest Beta versions of Domoticz can handle that as well.
Please provide some more details (debug output maybe?) explaining your problem.
One RPi with Domoticz, RFX433e, aeon labs z-wave plus stick GEN5, ha-bridge 5.4.0 for Alexa, Philips Hue Bridge, Pimoroni Automation Hat
One RPi with Pi foundation standard touch screen to display Dashticz