Added endpoint & randomUUID system

[bloodtick]

See discussion here: https://community.webcore.co/t/piston-external-url-value-available-to-self/13983

[idpaterson]

Thanks! I noticed that parent.state is not used elsewhere and found documentation from SmartThings suggesting that it may not always be safe to access directly. Would you please add a public method to the webCoRE smart app to return state.endpoint, similar to how isInstalled() works?

[bloodtick]

Will look at it. Shouldn't be a problem to do that later today.

[bloodtick]

All yours. State and Atomic are strange birds in ST land.

[idpaterson]

Is this finished? I wasn't able to trace where rtData.endpoint is meant to originate. I think you would need to provide that in getRunTimeData() for the webCoRE smart app.

[bloodtick]

Yes, it is complete. It is a little tricky they way it is called and took some time to figure out, but it is filled here: private Map getVariable(rtData, name) when the piston calls for endpoint.

It doesn't load on the web interface and shows "null" from the .toString() method. This is expected behavior.