the tftp client cannot send packets properly

Question

dear all: hello, I’m sorry to take up your time I am using the w5100s chip and after configuring the network, create one of the sockets as the tftp client. Sometimes I can use it to get files from the server normally. However, if the device is not powered on for a long time (one or two days), files may fail to be obtained occasionally. In this case, I used the packet capture software and found that no request packet was sent at all. Print to find that the snd len returned by sendto is negative. I wonder why this is happening and how to solve it. And the amazing thing is that when I restart the upper computer this goes away. Gap

Gaplin1 · Answer

图片11378×572 28.7 KB send error: image1133×670 46.6 KB After the restart: image1133×670 35.6 KB