Augment the README with instruction on how to connect to vendors' PPM backends

[kartben]

It would be nice to document how people can connect the grinding machine gateway to commercial endpoints like CONTACT Elements or Bosch Production Performance Manager.
I.e add a sub section in the README with an example command line for how to connect to a CONTACT PPM endpoint, and same for Bosch.

@bgusach @fpatz @ameinhardt @muelsen

[bgusach]

That is a good idea, but only if we are commited to maintain those vendor backends and somehow make their services usable to the public as a "playground" (among others, no credentials). Otherwise it would be just a bunch of broken links.

@fpatz what do you think? I'd go for it...

[fpatz]

At least we should tell the story (and as Benjamin said, also by example): standards create interoperability, and the testbed including vendor demos proves that interop actually works. Each vendor can then decide if or how a publicly accessible demo system can be provided. We'll check that internally (yo, corporate ... ;-)

[kartben]

 if or how a publicly accessible demo system can be provided

Exactly. And to be clear, there would be no issue for having the README say e.g "go to companyX.com to create a trial account on companyX's IoT Platform, and then configure your gateway this or that way, here's where you'd put your credentials, etc. and for more info go to docs.companyx.com". Hope that makes sense :-)