Re: [lwip-users] LWIP Raw API receive issue

[M S ARUL]

Hello Sergio,

    Thanks for the reply. 

//Did youcheck your driver and port are OK// 

Yes I have checked that, I am able to receive and transmit without any problem if the size is less (approximately less than 100 bytes, could be upto 200). As for the driver is concerned I have run the http server using this driver, it is able to send upto 512 bytes to the client without any problem.

//have an OS ? How is your NO_SYS ?// 

No I'm not using any OS, running in baremetal software, and NO_SYS also set to one.

//What is it, UDP, TCP ? // 

I'm using TCP protocol.

//do you actually get a proper pbuf with the proper pbuf->total_len// 

Yes stack gets the exact no of bytes it is receiving which is 536 bytes. I'm seeing in wireshark that 536 bytes are transferred. When I compare the data in the wireshark with the data in pbuf only first 200 bytes are matching, remaining bytes are not matching with the data shown in wireshark. Even if I transmit 534 or 488 bytes of data, stack is able to get the exact no of bytes received, but in all those only first 200 bytes are matching with the data shown in wireshark. I could't find where the issue is.

Thanks & Regards,

ARUL PRAKASH M

On 12-Jan-2018 6:03 PM, "Sergio R. Caprile" <address@hidden> wrote:

Well, I can think of a number of reasons for that:
- Your driver is buggy.
- Your port is broken.
- You are actually sending junk.
- Your application is badly written and/or you are not reading what you think you are reading.

Did you
check your driver and port are OK by runnning known-to-work applications like, for example, those in the apps directory or those in the contrib tree ?
sniff the traffic ?

Do you
respect the threading rules ?
have an OS ? How is your NO_SYS ?
have a DMA driver ?

What is it, UDP, TCP ? What is your code ? How do you setup your callbacks ? What do you mean "I read junk", do you actually get a proper pbuf with the proper pbuf->total_len and when properly reading that pbuf you see data that is different than the payload you saw in the traffic capture ?

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