For a project, I'm trying to survey the options for connecting an Arduino (+ ethernet shield) to the web for real-time telemetry and control.
I want to write a web page with some custom canvas/SVG widgets which react to the Arduino and can command it.
The widgets will need to access the Arduino via Javascript.
From what I can see, these are the options - what others exist?
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Run a web server locally on the Arduino. The server will need to support websockets/long polling for Javascript's XmlHttpRequest
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This is a problem, as the Arduino will be installed behind a home router, where port forwarding is not easy. There's also the problem of finding the Arduino's IP to connect to.
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Export my data/control interface to Pachube. Then, host my widget pages on my own server along with a Pachube-to-WebSocket proxy (to sidestep the cross-domain problem)
Is there a way to provide a custom real-time widget, controlling my Arduino, without having to run my own web server?