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Recovering bluetooth device address

I need to write a code to get the address of the device, CONNECTING to my site
So, for an instance, I visit my website with my phone. On button click, I need to get the Bluetooth address of it.
I've seen some examples showing how to get addresses of nearby devices. That's not what I need.
I don't have time for a proper research now, so if you have examples, please, share them with me.
I'd really appreciate your help.

There is this experimental API, but it’s not enabled by default
https://developer.mozilla.org/en-US/docs/Web/API/BluetoothDevice
Normally a website can not access such private device information, but apps that a user chooses to install can, such as an app written with ReactNative.

What's more accurate than GPS in determining location on mobile

I have a company where I want to show every detail like offices, ladders and WC's on a map on a mobile app to be displayed to visitors.
I want also to track the visitors inside the company or "Mall" through their mobiles ... counting them a day for example , and making a small social network between them.
GPS unfortunately isn't accurate enough to be used here. can you suggest a better localization method ?

Bluetooth beacons are designed for this kind of thing but depend on you getting users to download the app and turn on Bluetooth. Look into Apple's iBeacon standard and Google's Eddystone. Both can be used on Android and iOS.

Monitoring the displacement of a mobile device using GPS

I am wanting to develop an application for mobile devices, which shows in real time where a user (with this software installed on your mobile device) is. The idea would be that one (or more) users could follow the map the displacement of another user via GPS. I want to use PhoneGap with HTML5 and CSS and Javascript.
My question is: Is it possible to do that with these technologies? If yes, where can I get information of how to handle the GPS that way? If you can not, which language would give me this possibility and where can I get information? At first, I intend to develop this Application for Android and IOS.

Yes it’s very much possible with PhoneGap technology. You have to write a web service to keep the GPS coordinates as user updates (or auto updates) in server. You can let other users to connect to Web service and get the info they wanted (i.e. the data they wanted to see the current location of the user). You developed using PhoneGap means, it’ll work for iPhone too.
You can easily develop a web service either using PHP, Java or C# though C# web services are easy to write and maintain but PHP web servers are cheap compare to windows hosting (which you will need to host C# web service).
The question you asked is very broad so can write a 1000 words article and beyond. If you ask specific question I can answer that.

Using JavaScript in my web app to delete files on the user's smart phone

I'm a software developer from Germany and I have a special problem concerning smart phones, websites and security!
My web application - which is optimized for smart phones - allowes it to upload photo files (made by the smart phone camera) up to our webserver.
(I use the regular HTML File Control.)
It works fine!
But now we think about possibilities to delete the uploaded photos on the smart phone - via the web app!
Is there any chance to realize that?
Our users work with Firefox 17.0 for Android.
Maybe Mozilla offers proprietary JavaScript code to get access to the local smart phone devices ... ?
Or is there any possibility to change the local security settings of Firefox Mobile?
If both solutions can't be realized, could I develop a smart phone app (which is locally installed) that deletes the photos on the phone? I'm sure I could!
But then I need a possibility to start the app using my website code.
So I have the same security problem - I think so ... again I need a way to "leave" my website to get access to local devices via JavaScript or something else (to start the installed app on the phone).
Is there anybody who has an idea?
Thanks in advance.
Thomas

Get a tablets(iPad or Droid) mac address?

Synopsis: I am developing a HTML5 web app that will allow tablets(iPad or Droid) to login to a server and perform various functions. The client would like a way to check the devices mac address when logging in. From what I have read, most solutions use activex objects that will not work for webkit browsers.
Question: Does anyone know a solution that would hook into a HTML5 web app seamlessly(Idealy update a hidden form element with the value upon logging in)?
Thanks!

I don't think there's going to be a straightforward way to do this. The web server won't be exposed to a client's MAC address unless they're on the same physical segment...you'll only see the MAC from the most recent router hop in general.
If anything exists, it's going to be a browser plugin (show-stopper on iOS). And it would probably need more than the default permissions available (I don't suspect you can enumerate network interfaces in Java, for example, without asking for elevated permissions).

If you're looking for HTML/JS only then I don't think that this is possible. It won't be exposed.
The problem is that the packets you recieve back will only contain the MAC address of the node on the last hop.
This may be possible via a plugin, but then this limits you on iOS, and possibly also Android as you'd need to provide them a way of getting the plugin first (unless you used a plugin that was installed by default).
Edit: Not that I support an app for every little thing, but it shows that easy to press app buttons sometimes tend to do better than web apps (regardless of being able to make browser shortcuts to home screens). If it is suitable, you could consider loading this within a web view on the target device from within an app, from which you can then of course access MAC addresses and whatever else you may need.
MobiThinking: Mobile applications: native v Web apps – what are the pros and cons?
Forbes: Mobile Web App vs. Native App? It's Complicated