[lwip-users] PPP_STATS_SUPPORT

[Danish Ali]

I have LWIP 2.1.2 running using PPPOS through a 4G modem.

I now want to route the PPPOS via CMUX mode so that I can receive SMS 
messages while leaving the PPP link up.

Although this largely works, I find it less reliable than without the 
CMUX wrapper, so I thought I might check if the PPP layer was rejecting 
anything as garbled.

Looking through ppp.h and ppp.c it seems there is an option 
PPP_STATS_SUPPORT which would collect statistics on the link. But if I 
#define PPP_STATS_SUPPORT 1 in lwipopts.h then compilation fails in 
ipcp.c with the error
> netif/ppp/ipcp.c:2096:23: error: 'fsm' {aka 'struct fsm'} has no 
member named 'unit'
> netif/ppp/ipcp.c:2129:24: error: 'fsm' {aka 'struct fsm'} has no 
member named 'unit'

The offending lines are
> #if PPP_STATS_SUPPORT
>     reset_link_stats(f->unit);
> #endif /* PPP_STATS_SUPPORT */

> #if PPP_STATS_SUPPORT
>     /* XXX a bit IPv4-centric here, we only need to get the stats
>      * before the interface is marked down. */
>     /* XXX more correct: we must get the stats before running the notifiers,
>      * at least for the radius plugin */
>     update_link_stats(f->unit);
> #endif /* PPP_STATS_SUPPORT */

Do you have any suggestions as to how I could either fix this or use an 
alternative way to monitor the PPP process.

Thanks,
Danish