So, to get around the message "CloudDB is currently having connection problems due to server overload." as mentioned in the Mobile CSP curriculum Unit 7.6 Clicker App, I set up my own REDIS server on an Ubuntu instance. I set it up without SSL to make it easier and more likely to work well with students getting to my "outside" server.
Here are my settings (full password not shown), which work VERY WELL with the built in Android emulator and with the companion app and our Android tablets:
Here is a screenshot from the emulator, working just fine:
However, the IOS companion does not work at all with my this (non-SSL) custom REDIS server. Here are the two error messages received
So, while we have an easy workaround (use our Android tablets), I thought I'd report it.