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Re: [lwip-users] Interfacing LwIP for a radio communication
From: |
Sylvain Rochet |
Subject: |
Re: [lwip-users] Interfacing LwIP for a radio communication |
Date: |
Wed, 4 Feb 2015 22:31:30 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Hello Sergio,
On Wed, Feb 04, 2015 at 05:53:52PM -0300, Sergio R. Caprile wrote:
> Something is not clear to me here...
> "PPPoS" might be confused with PPP over SONET/SDH
> You guys are talking about plain old PPP, RFC-1661, Point-to-Point
> Protocol,
Exactly, I known it's a little bit confusing, we are using PPPoS on lwIP
as a meaning for PPPoSerial, you are right PPPoS is oftenly used for
PPPoSONET elsewhere.
> which (by definition) works over any point-to-point link, as long as
> it is full-duplex and can carry bytes (octets).
Full-duplex or half-duplex actually, radio links are mostly working in
half-duplex condition.
> I guess "point-to-point" and "peer-to-peer" can be considered
> equivalent in this aspect. So... Please forgive my ignorance, I don't
> know what a SwMi is (even less a centralized one) ;^) PPP runs on
> telephone modems and serial ports, although, as Sylvain cleverly
> points out, SLIP will have way less overhead, both in bandwidth and
> code size.
>
> Perhaps confusion comes from the way cell modems capture
> PPP by "dialing" a fake number ? Or because of authentication with
> PAP/CHAP ? As long as the two end points can see each other, you can
> establish a PPP link or a SLIP link. You don't need to "dial" or
> "login" to have PPP working. Authentication is not mandatory, you can
> bypass it.
Indeed !, thanks for pointing that out, this is obvious for me but I
guess this isn't actually obvious at first sight on PPP.
Sylvain
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