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This is great! I had a similar idea a while back but didn’t have the savvy to implement it.

One idea I did have was to set up the raspberry pi as an independent wifi hotspot. That way the phone wouldn’t have to be connected to the local wifi network at all, it could connect to the raspberry pi directly, which would route all requests to the controller page.

Of course the drawbacks to this are pretty clear – I don’t think you’d be able to access the internet on your pi anymore. But it might be useful for someone who wanted their retroPie system to be a bit more portable. You also wouldn’t need to know the IP address of the raspberry pi, you’d just have to connect to the hotspot.

Just a thought :)