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 Post subject: TMesh
PostPosted: Wed Dec 16, 2015 5:10 pm 

Joined: Tue Sep 01, 2015 8:31 pm
Posts: 24
Location: Paris, France
Hi JP,
are you aware of Tmesh: https://github.com/telehash/TMesh?

It looks like Filament (http://filament.com/) is using it on the top of LoRa (but I can not be sure, are they define PHY and MAC) to reach 16km, and the protocol relays on Telehash (http://telehash.org/) for messaging.

Looks impressive...

I would appreciate some of your opinions and comparisons to DASH7.

BR,
Drasko


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 Post subject: Re: TMesh
PostPosted: Wed Dec 23, 2015 9:55 pm 
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Joined: Tue Jun 12, 2012 4:33 am
Posts: 25
Location: New York, NY
I'm aware of it. Helium also has a custom MAC. Seems like it's a vertically-integrated MAC for the purpose of Filament's business plan, which is to use blockchain on endpoints in order to eliminate cloud silos in distributed IoT deployments. I think it's a fine idea.

There isn't enough information yet about Telehash / TMesh, but it seems like it has a point-to-point networking objective whereas DASH7's main objective is multicast networking (and especially multicast data collection). So I can see some possible synergy, here, using DASH7 as a data collection interface and TMesh as a way to do some backhaul to the internet (or any TMesh client). I think they should be able to run on the same device.

As for 16km, the PHY problems of doing TMesh are the same PHY problems we have in DASH7. With DASH7 we tend to benchmark range against 1mW (0dBm) transmission, 0dB antenna, and 26.5kbps. I don't know what they are benchmarking against, but there isn't any magic. There is no mention in TMesh about using error correction at the MAC layer, so I'd guess the 16 km benchmark uses LoRa at a high TX power and a low data rate -- and that is very plausible.


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