Re: [lwip-users] Debug pppos packet loss issue

[Axel Lin]

2017-03-02 23:16 GMT+08:00 Simon Goldschmidt <address@hidden>:
> Axel Lin" wrote:
>> Only compare the download size then I know it's incorrect.
>> (and sometimes it's correct)
>
> LTE or not doesn't matter much: TCP should rearrange the stream based on good 
> checksums and sequence numbers.
> If anything is wrong at the application level, I would first debug the 
> application, not the PPP connection.

Actually, I did check the application code multiple times.
Today I try the same application code using wifi module and there is no problem.
The download size mismatch issue only happens when using LTE module.

>
> And if this is HTTP, did you receive a content length in the HTTP header that 
> you could use to verify the
> size?

Yes, I have added debug code to compare content_length and the data
length I received.

>
> I couldn't hurt though to debug at TCP level to see if all pbufs passed to 
> the application have consecutive
> sequence numbers. However, I don't know if we have a decent debug setting for 
> that.
>
>
> Simon
>
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