Having 5 devices connect to different ports is fine, not a problem, but 
*why* do you want separate ports?

You can have a single page and have it split into sections and have them 
all update. You can, at the same time, have 5 things connected somewhere. 
You can even make a link between those connections and the sections on the 
page.

But what you're describing is very vague, so whether your specific idea is 
possible cannot yet be answered. However, create a digital dash for an 
automobile definitely can be made, with Node or whatever else. (I know 
because I was working at a connected car startup and we did these things 
with Node).

So - about that page. Where do you wanna show this dashboard - on each 
android device or each device gets its own "section" of the page? I'm 
assuming you want to link 5 devices to the 5 page sections - why do you 
need separate ports? You can have a single app listening on single port, 
but keeping track at which and how many devices are connected. And you can 
have the app also keep track of those "sections" of the page, and update 
accordingly.

So, share more details for more detailed answer, please.

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