Sandbox user can observe errors during generation of sample (Smart House Demo) apk. Looks like after "change ip" command you need to wait some time before you can proceed with apk generation.
Steps to reproduce:
1) open sandbox web console in browser.
2) change kaa services host/ip
3) click "Get Binary" for Smart House Demo
You will se something like:
Getting SDK for requested project...
Unexpected service error occurred: 500 Server Error