W5500 is in TCP_ In server mode, you cannot Ping or communicate in the switch / router network.

When the chip is in TCP_Server In mode , At the switch / The router network cannot ping Communication is also impossible .

R: WIZnet The chip is a hardware protocol stack chip , Different from software protocol stack , If the chip does not actively contract to the network , stay TCP_Server No packets will be sent in mode , This will cause routing ARP Cannot form IP and MAC Equipment correspondence .

A: Solution :

Go anywhere when the chip is powered on IP Send a UDP Data packets , So as to update the routing ARP surface , Form a matching relationship , Subsequent communication will be normal .

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