On 7/4/15 12:31 PM, Bob Camp wrote:
Hi
As silly as it sounds, having a separate board for the user i/o is probably the
best way to go.
You already have an empire of devices that (somehow) chat with each other. The
barrier of
“it’s all on one device” has been broken even before i/o has been added.
Well, sure.. that's what the BBB is for.. mostly the UI. but at some
point, the web server has to tell someone else what to do. You can fire
off another process, send a message to another processor (or thread), or
whatever.
And I was looking for a simple(!) webserver that supports this level of
sophistication. There's plenty of very lightweight examples out there
(that run on Arduinos for instance) that are basically single threaded..
you intercept the "GET /myfunction" (or whatever) and that turns into a
"call abc(parameters)"... and while "abc()" is running, the webserver
isn't. That's fine for "setting parameters", but not good if the abc
process is going to take minutes.
Once you get past that part of it, it’s all a bunch of “that depends” and
personal preference. There is very little
right and wrong. For very little money, you can go from a single core to a quad
core device on your i/o
processor. The same is true of RAM and flash. If this is a one up (or few
dozen) sort of thing, optimizing the
board probably makes less sense than attacking the (inevitable) multitude of
Ardunio gear controlling the
rest of it.
=====
Assuming that we’re not already way off track - I’d use a “real” web server to
feed the user. You get the full
range of modules that way. You can handle anything you decide you need as the
feature list expands. I’d back
it up with Python, just because it seems to work fine and I already have worked
my way up the learning curve. Others
would (I’m sure) recommend languages that they are more familiar with. They all
will get you to the same end
result. If you want to be cool, there’s always Node.js …
Yeah, that's where I'm heading.. but I was looking for something between
"single threaded webserver with direct calls" and "install apache"
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