Thanks for the response. Speaking of uninstalling / re-installing (which you shouldn’t have to do), we’ve seen some luck on this error when people uninstall/reinstall the Cayenne agent that actually runs on the Pi (rather than the Android app itself, although maybe that was enough for @baz ).
To do that, on your Pi enter the commands:
To re-install, just log into your Cayenne account at http://www.cayenne-mydevices.com/ and use Add New… > Device and follow the on-screen instructions. (or use the Android app to re-add your Pi)
We’ll continue to investigate the root cause of the ‘Server Error’ messages internally so we can squash it and eliminate this hoop-jumping.