Any news on this topic?
I have a NETATMO thermostat that can be controlled by IFTTT and send notifications to IFTTT.
Integrating with Cayenne could be very useful.
The maker channel looks very easy to use and adapt - a simple web request in either direction.
From device to IFTTT can be coded on the device, though adding as a cayenne trigger would be better.
From IFTTT to device needs a web server to receive the request.