I'm having a similar problem with the version 5 sensor gateways. I have a ton of version 4 gateways working just fine, but I'm also getting an Invalid Operation error when trying to poll the version…
Well, looks like iReasoning (http://ireasoning.com/download.shtml) is the popular tool so I'll go with that. Running out of time today but I'll hopefully capture a proper "GET" exchange to…