[lwip-users] Debug pppos packet loss issue

[Axel Lin]

Hi,
I'm using current lwIP master tree.

I got my device connect to internet via 4G/LTE module now (by PPPoS).
However, I found sometimes download file size mismatch when
try to download some files (about 100KB) from http server.

I tried enable PPP_DEBUG / PRINTPKT_SUPPORT / PPP_PROTOCOLNAME /
LWIP_STATS_DISPLAY, but I don't see any unusual things.

The only strange thing is in download success case, the download speed is fast.
In download file mismatch (seems some packet lost) case, the download
speed is very low.
Any hint to debug such issue?

Thanks for your help,
Axel