[guardian-dev] GilgaMesh (was Re: FireChat moved off iOS proprietary mesh to their own xp mesh protocol?)

[Michael Rogers]

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On 02/10/14 21:07, Chris Ballinger wrote:
> However, I think it would be beneficial to utilize other transports
> for Android<-->Android and iOS<-->iOS for increased overall range /
> mesh quality. The iOS MultipeerConnectivity framework uses Wifi /
> Bluetooth in a proprietary/closed way and will never interoperate
> with Android (by design). Android supports Wifi Direct in a more
> open fashion, but it will never interoperate with iOS because Apple
> likes to be stubborn.

Someone reverse-engineered the wifi parts of the Multipeer
Connectivity Framework - it's a combination of Bonjour for service
discovery, self-signed X.509 certs for mutual auth, and DTLS with a
magic byte prepended for data transfer. It should be possible to
create a compatible Android library.

https://nabla-c0d3.github.io/blog/2014/08/20/multipeer-connectivity-follow-up/

I don't have time to work on this right now, but it would make a good
Masters project.

Wi-Fi Direct legacy mode is another promising path for
interoperability - one peer creates a standard access point with a
random SSID and password, the other peer connects to it as a standard
client. So if you can pass the SSID and password from the AP to the
other peer (e.g. via a QR code, or by encoding them in the AP's
Bluetooth device name), the other peer just needs an API for
connecting to wifi access points. Which hopefully even Apple supports?

Cheers,
Michael
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