Readme updated

README.md

@@ -37,6 +37,11 @@ For ESP32C3 -nic user,model=esp32c3_wifi:
   -nic user,model=esp32c3_wifi,net=192.168.4.0/24,hostfwd=tcp::16555-192.168.4.15:80
 ```
 
+In Station mode, you must use one of the [hardcoded SSIDs](https://github.com/lcgamboa/qemu/blob/7a976c88ebf7338f25b7079d8595d262fb48cc43/hw/misc/esp32_wifi_ap.c#L65) (PICSimLabWifi, Espressif, or MasseyWifi) without a password. 
+
+The MAC address is defined for for ESP32C3 in bytes from offset 0x18 to 0x1D in the efuse file. For ESP32 in bytes from offset 0x4 to 0x9 and the [MAC CRC](https://gist.github.com/igrr/3537f8ddb03a50aa980e2e0c121c7581) inf offset 0xA in the efuse file.   
+
+
 For use with ESP-NOW, configure the WIFI interface as socket mcast and ensure each device has a different MAC address in the .efuse file.
 ```
 -nic socket,model=esp32_wifi,id=u1,mcast=230.0.0.1:1234