[lwip-devel] [bug #57976] TCP data communication broken due to ACK transmission delay

[Praveen Kumar]

Follow-up Comment #4, bug #57976 (project lwip):

Hi Simon,

In Cycle2 log, if you see line number 3,4,5 - The TCP packet is received from
ECU at time 0.009955 seconds, immediately I will initiate TCP ACk packet and
tcp_output(). But at the same time, data packet needs to be sent to ECU every
10ms once. So I will initiate tcp_write(data) with tcp_output(). 
Later when I see the packets in wireshark, I am seeing the ACK & SEQ number
which needs to be updated with ACK packet, are updated in data packet and sent
out, and later around 100uS, the ACK pack t is transmitted with different ACK
& SEQ numbers.

As the ACK & SEQ numbers are different in acknowledgment packet, our ECU is
recording error and initiating re-transmission. 
This is happening very frequently and recording an error in ECU system.

So I just want to know that how to send ACK immediately once I receive input
packet.

Regards,
PraveenKumar. 

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