[lwip-devel] [task #13780] lcp_echo_interval maximum value

[Sylvain Rochet]

Follow-up Comment #5, task #13780 (project lwip):

Well, this is what I thought :-)

For cellular modems, the PPP link is only between your target running lwIP and
your GPRS modems, LCP frames are not sent over the air, there is actually no
PPP at all over the air. PPP is only used because it is a convenient way to
frame IP packets over a serial link, that's why you don't need authentication
(or a very weak one).

Do you really need to optimize the data exchanged between your target and your
GPRS modem up to this point ? We are talking about a few tens of bytes every a
couple of minutes. The modem is going to ping your target more often than you
currently wish (unless it is configurable) and you have to answer to its LCP
ping request on time.

In this context, do you still need to reduce the number of LCP ping requests
?

Sylvain
 

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