W5500 as TCP client POSTing failures

Question

Hello all: I have designed a custom board around W5500 for uploading data logger data to my server. Every thing is OK until the SEND process: I am sending a POST in order to get success response from the server as HTTP/1 200 OK but most of the time I see that the post string is wrapped with “endless garbage bytes” sent along with it. The strange thing is that some times it do send the post right and server response is OK!! I thought that handling of TX_WR is not right but when I got OK few times I got confused Same code behave differently… see below log: partial log of connection and sending: connecting… .Wait for CONNECT… - waiting for connection loop .Wait for CONNECT… .Wait for CONNECT… .CONNECTed… wiz5500 connected to server… . .SENDing 0x0096 bytes (sending a post to server) .ptr_WR = 0x00b8 - initiated WR pointer value .ptr_RD = 0x00b8 .len = 0096. - data lengh .ddrsel = b810 - writing address Sending… .Sn_IR_SENDOK… - data have sent ok . .ptr_WR = 004e - WR pointer after sending ( expect 0x00B8+0x0096 = 0x014E ) .ptr_RD = 004e . .Socket closed… Please explain why TX_WR value after sending is not original value + data lengh as expected. Most sig byte is 00 while should be 01… POST sent to the server: POST /update HTTP/1.1 Host: 178.62.117.121:0080 Content-Type: application/octet-stream Accept: / User-Agent: Creacell/1.0. Content-Length: 0… Server response if success: HTTP/1.1 200 OK X-Powered-By: Express Date: Fri, 12 Jun 2020 20:20:42 GMT Connection: keep-alive Content-Length: 0 Any advise will be much appreciated. Becky?.. Dan

bangbh · Answer

Hi I tested TX_WR before and after sending bytes. But it works well. I don’t think it’s a pointer problem. There must be a http protocol problem. Please refer the link below. W5500 - TX_WR pointer math W5500 Hello I tested like the picture below. [image] [image] I don’t know exactly how many bytes I sent, but I seems work fine. Thanks. Thanks.

bangbh · Answer

Hi I don’t think it’s a endian or pointer problem. Before you do it with our IC, please test it with https://reqbin.com/ ← this kind of site first. And if it’s possible, let us know about your test environment more detail. share the wireshark packet capture. Thanks.

cellkey · Answer

Hi Peter: Problem solved and everything works nice now… I have recompiled with the last version of ioLibraray files and all have been settled… Thanks Dan