I'm not trying to propose a "way" of anything, "secure", "decentralised" or otherwise! Don't you get it? I'm talking about the documentation.

I have no idea if this solution to the problems posed is sound because before I can even get to the source code there is no description of how or even whether it solves the fundamental problems in the cryptographic situation it describes (viz. device which cannot straightaway engage in IP communication requires to receive unsolicitated securely-encrypted messages).