This freeware open source educational project has existed for more than 5 years:
http://www.turbocontrol.com/monitor.htm

This recent page mentions Processing a bit:
http://www.turbocontrol.com/mobileard.htm

The above page has a link to this tutorial:
http://processing.org/tutorials/android/

I'd like to add a section to this new web site that uses the above tutorial and then adds source code for Bluetooth and WiFi communication:
http://www.ctrlterm.com/

Should I use the Ketai library as available here?
http://wiki.processing.org/w/Android#Contributed_Library

Thanks for your suggestions!  My goal is to make Android communication programming as easy as possible.  I'm sure many industrial engineers (my main field) will be glad to give Processing a try.