zeromq - PUB-SUB using XPUB-XSUB

[Hiren Shah]

Currently I already have PUB-SUB set-up with Curve Security.  I have multiple PUB each using different key for encryption. 

I want to change it to use XPUB-XSUB which is straight forward. I don't see example or documentation how to use XPUB-XSUB with Encryption/Decryption (Curve Security). Each publisher is using different Key.