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For the HQ GUI side, use a browser and Javascript. You don't need a web server. You don't really need a web server on the device side either but it's useful to have a HTTP webserver to get a web page as a starting point and to configure things. Note that having a webserver is a security risk so if you are new to all this, I wouldn't suggest you have one on the devices in production but it will help you developing. You will need a Web server on the HQ side if you are doing database stuff but I'd suggest you talk to IT to get provisioning which will probably be an Apache Server-which they will maintain.

Well. Aren't we a ray of sunshine nowadays