WiFi router networking?

Nymble nymble at gmail.com
Wed Sep 16 10:46:17 PDT 2015


> On Sep 15, 2015, at 10:21 AM, jim bell <jdb10987 at yahoo.com> wrote:
> 
> Has anyone heard of an idea to use individual WiFi routers to communicate in a mesh net?  
Yes .. but usually using proprietary routing or 802.11s.

> (Or, at least differently than it may have been done before.)   If you look at a map of WiFi routers (www.wigle.net) in any given area, you will see that the vast majority of routers are physically close to many other routers, certainly close enough to communicate with each other, and ultimately over a long distance.  A crowd-sourced communication system, one that wouldn't necessarily go through the Internet backbone.  Conceptually related to the Bittorrent system.    I just  found this:   https://en.wikipedia.org/wiki/Wi-Fi_Direct <https://en.wikipedia.org/wiki/Wi-Fi_Direct>
This technology is intended for ‘direct’ peer-to-peer links and is being used for a few applications like phone to TV video streaming.  It’s not really a P2P technology in that one device always becomes the equivelent of a normal ‘AP’.  It makes it difficult to scale to larger topologies.

A better Wi-Fi P2P solution is: http://www.wi-fi.org/discover-wi-fi/wi-fi-aware <http://www.wi-fi.org/discover-wi-fi/wi-fi-aware> 
It’s new, but hopefully we’ll be seeing rapid incorporation into products.  For a change, the specifications are free and worth a browse.  The P2P discovery model is intentionally blinded to a degree by the use of truncated hashes of the ‘service names’ (6 octets).  P2P data exchanges are possible pre-association (no connection overhead).  


Paul

> 
>             Jim Bell
> 
> From that URL:
> 
> "Wi-Fi Direct, initially called Wi-Fi P2P, is a Wi-Fi standard enabling devices to easily connect with each other without requiring a wireless access point.[1] It is usable for everything from internet browsing to file transfer,[2][3] and to communicate with more than one device simultaneously at typical Wi-Fi speeds.[4] One advantage of Wi-Fi Direct is the ability to connect devices even if they are from different manufacturers. Only one of the Wi-Fi devices needs to be compliant with Wi-Fi Direct to establish a peer-to-peer connection that transfers data directly between them with greatly reduced setup.[citation needed]
> Wi-Fi Direct negotiates the link with a Wi-Fi Protected Setup system that assigns each device a limited wireless access point. The "pairing" of Wi-Fi Direct devices can be set up to require the proximity of a near field communication, a Bluetooth signal, or a button press on one or all the devices. Wi-Fi Direct may not only replace the need for routers, but may also replace the need of Bluetooth for applications that do not rely on low energy.[5]"

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