Description
Board
ESP32 Dev Module
Device Description
ESP32-WROOM-32
Hardware Configuration
Version
latest master
IDE Name
Arduino IDE
Operating System
Windows 11
Flash frequency
40Mhz
PSRAM enabled
yes
Upload speed
115200
Description
With ESP32 Ardunio < 2.0.0 it was possible to use ESP IDF functionality to use the custom MAC address from the efuse (see https://docs.espressif.com/projects/esp-idf/en/v4.4/esp32/api-reference/system/system.html?highlight=esp_base_mac_addr_set#custom-base-mac).
With ESP32 Arduino 2.x.x this functionality is broken because in ETH.begin() the interface is both reset and set up again. It will still look like the MAC address is custom but the low-level MAC address of the network interface is not custom but the internal one. This can be verified e.g. by using ARP scan (e.g. in Windows cmd: "arp -a").
The functionality could be reintroduced and the problem fixed by providing an additional argument to ETH.begin() where the user can select to read in the MAC Address from efuse. The custom MAC address can then be read in between the reset and setting up the interface.
Sketch
//The following code does NOT work anymore after updating to ESP32 Arduino 2.x.x
#include <ETH.h>
#include <WiFi.h>
void setup()
{
Serial.begin(115200);
uint8_t p[6] = { 0x00,0x00,0x00,0x00,0x00,0x00 };
esp_efuse_mac_get_custom(p);
esp_base_mac_addr_set(p);
ETH.begin(); // in ESP32 Arduino 2.x.x this is undoing the step above
}
void loop()
{
}Debug Message
-
Other Steps to Reproduce
No response
I have checked existing issues, online documentation and the Troubleshooting Guide
- I confirm I have checked existing issues, online documentation and Troubleshooting guide.