Doesnt it make sense to update to 1.4.1 before asking about a bug or problem?
From: [email protected] [mailto:[email protected]] On Behalf Of Rodrigo Garbi Sent: Tuesday, August 27, 2013 9:29 AM To: [email protected] Subject: Re: [lwip-users] TCP ACK Problem? Anyone? 2013/8/23 Rodrigo Garbi <[email protected]> Hi! I'm working with FreeRTOS v7.0.1 and LwIP 1.4.0 and I'm facing the following problem: Device A and B transmit data every 40 ms to my board (where I'm running LwIP) and once in a while I can notice some data from device A is being missed. So I did some research with CommView and found that: 1) Device A sends data (9 bytes length) to my board and get correct ACK from it: Sequence: 0x13D5388C (332740748) Acknowledgement: 0x00001A57 (6743) Response from my board: Sequence: 0x00001A57 (6743) Acknowledgement: 0x13D53895 (332740757) 2) Device A send 9-bytes data to my board, but this won´t ACK: Sequence: 0x13D5389E (332740766) Acknowledgement: 0x00001A57 (6743) Sequence: 0x00001A57 (6743) Acknowledgement: 0x13D5389E (332740766) 3)Device A does not care about it (maybe because data is already in ethernet transceiver buffer) and sends a new data (9-bytes); my board will not ACK it: Sequence: 0x13D538A7 (332740775) Acknowledgement: 0x00001A57 (6743) Sequence: 0x00001A57 (6743) Acknowledgement: 0x13D5389E (332740766) 4)Same as 3 Sequence: 0x13D538B0 (332740784) Acknowledgement: 0x00001A57 (6743) Sequence: 0x00001A57 (6743) Acknowledgement: 0x13D5389E (332740766) 5) Same as 3 Sequence: 0x13D538B9 (332740793) Acknowledgement: 0x00001A57 (6743) Sequence: 0x00001A57 (6743) Acknowledgement: 0x13D5389E (332740766) 6) Finally, device A is aware of the problem and retransmits data, but instead of transmitting 36 bytes (9 x 4), only transmits 18 bytes Sequence: 0x13D5389E (332740766) Acknowledgement: 0x00001A57 (6743) Data length: 0x12 (18) And my board running Lwip 1.4.0 will acknowledge 36 bytes instead of 18: Sequence: 0x00001A57 (6743) Acknowledgement: 0x13D538C2 (332740802) So device A won´t transmit last two 9-bytes packets, and they will be lost! Anyone can help me with this? Is it a bug in LwIP or what is happening? Thank you!
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