I am trying to get an EUI64 value from my ESP32, as I want to use it for a LoRaWAN DevEUI value, but I'm unclear where the last four bytes are coming from? The 48-bit MAC is clearly visible in the eFuse, but I'm not sure where the 0xFC3F comes from that gets amended to the 48-bit MAC when I call esp ...

I am using an ESP32 with a W5500 SPI to Ethernet controller, using the integrated driver in ESP-IDF v5.0. Things work well upon boot up, and upon a single disconnection and re-connection of the Ethernet cable. However, if I disconnect the cable twice, I never seem to get an ETHERNET_EVENT ...