Collection of Permanent Reference NODES

@Niels
I did not intend to say that these data have to be sent in json (or similar format) by the NODEs. It is the format that I would like to receive for my applications.
For implementation of that I was thinking about codifying the data, as you also did mention in another thread. I do take that a little bit further. For this codification one may get some inspriration from OpenZwave. Z-Wave messages are very compact and meaningful, and have to adhere to the same frequency restrictions as LoraWan. You can see this codified data as a kind of virtual device layer.
To get a first impression of ZWave see this table from Micasaverde