I have found no way to monitor sensors using the coap interface. As soon as pytradfri supports sensors (if ever), I'll update the plugin accordingly. The panels should work, but need to be added to the devices.ini... I have no panels, but if you have some, you could run the interactive pytradfri shell, and issue the devices-command and provide the output, and I'll be able to add the panels...
Regards,
M