"Augmenting" Existing Access Points

A project log for SubPos Positioning System

A "dataless" Wi-Fi positioning system that can be used anywhere GPS can't.

BleckyBlecky 04/26/2015 at 14:521 Comment

Now that we have updated the coding schema, we can now make our router accept hex string ASCII SSIDs.

I mentioned earlier that you would be able to convert an existing Wi-Fi access point into a beacon node. I currently own a Billion BiPAC 7800VDPX and will show you how to perform this on it.

This router allows you to set additional SSIDs for a particular Wi-Fi adapter (2.4G) via this page

You should be able to convert the position coder's hex character output to ASCII characters and copy and paste this into the SSID text field. If you have problems with this, then lets look at the post command for the form: 

If we modify the form data object "wlSsid_wl0v1" (this label corresponds with the "name" value of the textbox in the html code) with the following URL coded hex data (note that the Billion terminates its SSID string with the 0x00 null character and also doesn't like the space character, so I had to modify the coder to adjust the bitmask for this value too), we get the following post command:

Pop that into your web browser and submit it (if it says invalid session key, just ignore it).You will see the new SSID

in the textbox. Make sure Enable is ticked and click Apply. Your new SubPos SSID will be available for positioning.

Now you might want to restrict connections to that particular SSID, since enabling extra SSIDs on this router also creates an open network. To restrict all devices from connecting, go to the MAC Filter page for that interface:

Once at that page, select "Allow" for "MAC Restrict Mode". This will deny all unless you specify an allowed device in the list.

SubPos is now enabled on your router!

I now get the following decoded data on the updated Android application, which corresponds to the dummy data here:

Very lots much success!


306004344 wrote 08/02/2017 at 10:51 point

Teacher, I want to continue to do this project, and to complete it, so i have some questions need to ask you,to increase the existing access points,is BiPAC 7800VDPX a specific WiFi router?

i can't find this WiFi router in China...what if other brands and models of routers are available? if the WiFi router needs to be re coded,where can I download this firmware?

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