Hi Nikolas, On Mon, Oct 10, 2022 at 04:17:11AM +0000, Nikolas Karakotas wrote: > Hi, > > Is there a reason why the LCP echo data type size is u8?
Yes, memory footprint. I am not against changing it but at first I would
like to understand why an LCP echo interval over 255 seconds would be
necessary.
> In Iot devices the transmission interval can be high from 5 minutes to
> an hour + or event driven.
>
> Wouldn't it be more flexible if this was a u16 to allow for a larger
> echo interval to be set?
I guess you are using a cellular modem with PPP. In this case LCP
packets are not sent over the air and LCP echo probes are only used as a
serial link check between the MCU and the modem. Cellular modems being
all buggy as hell this serial link check does not do a true check that
the modem is still alive as the RF part can be in a dead end but not the
serial part, making the check unreliable.
It would make much more sense to me to disable LCP echo at all by
setting lcp_echo_interval to 0 instead of setting it to more than 5
minutes or even hours.
Also, PPP can be attached and detached ("reconnected" and
"disconnected") without changing the RF state. On cellular modems, RF
state is managed through AT commands (AT+CGDCONT, AT+CGACT, …).
Sylvain
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