util.cpp

#include "util.h"
#include "sensor_console.h"

#if defined(ESP8266)
#  include <ESP8266WiFi.h> // required to get MAC address
const char *current_board = "ESP8266";
#  if !defined(AMPEL_WIFI)
void preinit() {
  // WiFi would be initialized otherwise (on ESP8266), even if unused.
  // see https://github.com/esp8266/Arduino/issues/2111#issuecomment-224251391
  ESP8266WiFiClass::preinitWiFiOff();
}
#  endif
#elif defined(ESP32)
#  include <WiFi.h> // required to get MAC address
const char *current_board = "ESP32";
#else
const char *current_board = "UNKNOWN";
#endif

void Ampel::showFreeSpace() {
  Serial.print(F("Free heap space : "));
  Serial.print(ESP.getFreeHeap());
  Serial.println(F(" bytes."));
  Serial.print(F("Max free block size : "));
  Serial.print(esp_get_max_free_block_size());
  Serial.println(F(" bytes."));
  Serial.print(F("Heap fragmentation : "));
  Serial.print(esp_get_heap_fragmentation());
  Serial.println(F(" %"));
}

char sensorId[10]; // e.g "ESPxxxxxx\0"
char macAddress[18]; // e.g "XX:XX:XX:XX:XX:XX\0"
uint8_t mac[6];

char* getMacString() {
  WiFi.macAddress(mac);
  // Get all 6 bytes of ESP MAC
  snprintf(macAddress, sizeof(macAddress), "%02X:%02X:%02X:%02X:%02X:%02X", mac[0], mac[1], mac[2], mac[3], mac[4],
      mac[5]);
  return macAddress;
}

char* getSensorId() {
  WiFi.macAddress(mac);
  // Get last 3 bytes of ESP MAC (worldwide unique)
  snprintf(sensorId, sizeof(sensorId), "ESP%02x%02x%02x", mac[3], mac[4], mac[5]);
  return sensorId;
}

Ampel::Ampel() :
    board(current_board), sensorId(getSensorId()), macAddress(getMacString()), max_loop_duration(0) {
  sensor_console::defineCommand("free", Ampel::showFreeSpace, F("(Displays available heap space)"));
  sensor_console::defineCommand("reset", []() {
    ESP.restart();
  }, F("(Restarts the ESP)"));
}

Ampel ampel;