WIZnet Developer Forum

Does W7500S2E-R1 support multiple TCPIP connections?

I am using W7500S2E-R1 module ? does it supports multiple ports , i mean multiple TCPIP connections simultaneously?

The S2E module doesn’t support multiple ports.

Hi,
I am using W7500S2E-R1 module with serial configurations - 384k baud, 8 bits, No parity, 1 stop bit and setting the module as TCP/IP client. While receiving files more than 1MB data from server, i consistently getting communication drop in the middle of sending packets.

I checked the wireshark. After communication is established with (MSS=1460), the server starts to send the file with TCP packet of 1514 bytes at a time(payload = 1460). At one point, when the Server sends a TCP packet , the module doesn’t acknowledge the receiving data and so the server timesout and sends RST. In the receiving end, i get only half the bytes (around ~700 bytes). Other bytes are missing. I checked my application, it does went through any buffer overflow or any UART errors.

What might be the possible error?

How to reduce the transmission packet length to be send over TCP/IP in Wiz module?
For instance, if i want to reduce the Maximum segment size(MSS) in TCP protocol, what settings i have to do to the module?

Thanks in advance

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