W5100 send SOCKERR_SOCKSTATUS after few success writes

Question

Hi All, I am using w5100 Ethernet shield with STM32L476 Nucleo board. I have following flow which fails at 5th operation, Can anyone help in figuring out what could be wrong in my operation. 1. Create Socket socketNumber = socket(0, Sn_MR_TCP, portNo, SF_TCP_NODELAY); socket() created socket number = 0 socket create return val = 1 2. Send data on Socket socket number = 0 & numBytesToWrite = 132 retValue = send(socketNumber, (uint8_t *)pBuffer, numBytesToWrite); send retValue = 132 3. Read data on Socket socket number = 0 & maxBytesToRead = 2048 retValue = recv(socket, (uint8_t *)pBuffer, maxBytesToRead); read bytes retValue = 1950 4. Send data on Socket socket number = 0 & numBytesToWrite = 267 retValue = send(socketNumber, (uint8_t *)pBuffer, numBytesToWrite); send retValue = 267 5. Send data on Socket socket number = 0 & numBytesToWrite = 6 retValue = send(socketNumber, (uint8_t *)pBuffer, numBytesToWrite); send retValue = -7 #define SOCKERR_SOCKSTATUS (SOCK_ERROR - 7) ///< Invalid socket status for socket operation. What could be that it is returning SOCKERR_SOCKSTATUS error. Best regards, Sachin

Eugeny · Answer

When error occurs please read Sn_SR register to identify which status socket is in.

Sachin Gole · Answer

Hi Eugeny, Thanks for reply. After write failure I tried to read Sn_SR register it gave following value. Send data on Socket socket number = 0 & numBytesToWrite = 6 retValue = send(socketNumber, (uint8_t *)pBuffer, numBytesToWrite); send retValue = -7 Sn_SR(socket) retValue = 1027 Best regards, Sachin

Sachin Gole · Answer

Sorry for inconvenience. Previously, I just gave you #define for Sn_SR(socket) As it is 0x403 Now I just checked retValue = getSn_SR(socket); retValue = 0

Sachin Gole · Answer

Thank you Eugeny for reply. Finally I tried with local server on machine and send request from board and found that my processing take time so server timeout and close socket. I have increased server read timeout and it worked. I need to process my data ASAP so server will not give timeout. By the way I have not found blocking flag for 5100 while creating socket. How to implement blocking send or connect request.

Eugeny · Answer

Sachin_Gole: By the way I have not found blocking flag for 5100 while creating socket. How to implement blocking send or connect request. Please explain. What you want to achieve?

Sachin Gole · Answer

Currently I don’t have any blocker, as my application has lot of transaction with multiple socket on server so I was thinking to have each transaction in blocking mode which can confirm each operation done synchronously. I can see that other chips like 5500 has flag SF_IPv6_BLOCK so thought if needed to 5100 then how I can implement same.

Eugeny · Answer

What is “blocking mode” in your understanding? Please explain what you want to achieve (not how you think you can achieve something).

Sachin Gole · Answer

synchronous write/read for large data in range of 20KB.