[EnthernetENC] Failed to reacquire a new IP address from the DHCP server

MCU Board               : Raspberry Pi Pico

Ethernet Network Module : ENC28J60 

Firmware                : Arduino

EthernetENC Version     : 2.0.5

Issue: 

After switching to a different network, it fails to reacquire a new IP address from the DHCP server using `Ethernet.begin(mac)` function.

Solution: 

Modify the void UIPEthernetClass::end() function in EthernetENC/src/Ethernet.cpp.

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Change: 

    configure(INADDR_NONE, INADDR_NONE, INADDR_NONE, INADDR_NONE);

To:

    configure(INADDR_ANY, INADDR_ANY, INADDR_ANY, INADDR_ANY);

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***** 以上方法是試出來的，有沒有 side effect 不知道 😛 *****