Connect meteor frontend to multiple backends

I have seen several examples of using ddp connect url to connect multiple different meteor frontends to one backend meteor app.
I would now need the opposite case: Connecting one frontend to multiple meteor backends:

I have a raspberry pi that should have one meteor backend app and a regular webapp that should be the other meteor backend & frontend. This app should then be able to connect to the raspberry pi meteor app. It does not require authentication and I would like to use meteors pub sub instead of some restify solution.

If this does not work I would probably have to use something like adonisJS for the two backends and vuejs spa for the frontend.

get the ip or url where you want to connect, and do DDP.connect(ip/url). that simple