W5500 as a client connection problem

Question

Hello. I successfully ran W5500 as a server (I can connect to it, of course), but I have a problem with a client mode. Writing to the registers looks like this: PHY configuration (OK - address 192.168.1.30, mask 255.255.255.0, gateway 192.168.1.1, MAC 00-08-DC-01-02-03 as in the datasheet) MR->0x01 (TCP mode) PORT->46 (source port) CR->1 (socket open) loop to check, if opened - OK DIPR->192.168.1.31 (target IP) DPORT->46 (target port, the same as the PORT) CR->4 (connect) loop to check, if established (if SR->0x17) - this fails and it’s always endless loop And in this loop SR is 0x13 (opened) for about 2 seconds, and then it becomes 0 (disconnected). In IR register bits TIMEOUT and DISCON are always set (why is it like this?) I tried with connecting through router and directly between computer and W5500. Windows Firewall is turned off.

Eugeny · Answer

You must look into the Wireshark logs to see if SYN packet is really being sent, what exactly it has inside, and what is the response of the server (or no response or “destination is unreachable”).