Rally bluetooth controller

Projects Programming
14

It's available from the IDE's board manager. Exactly where depends on which version of the IDE you're using. With v1.8.x it's Tools --> Board --> Board Manager

Also, which board have you selected to compile for? Again with With v1.8.x it's Tools --> Board

The following minimalist code compiles for me with ESP32 Core v3.1.1 which is fairly recent.

#include <WiFi.h>
#include <esp_mac.h>

void setup() {
  uint8_t baseMac[6];
  esp_read_mac(baseMac, ESP_MAC_WIFI_STA);
}

void loop() {
}