#include <ArduinoJson.h>

char timestamp[15] = "";

void setup() {
  Serial.begin(115200);
  char buffer[100];
  toJsonObject(buffer, sizeof(buffer));
  Serial.println(buffer);
}

void loop()
{
      timeToString(timestamp, sizeof(timestamp));
      Serial.printf("%s: New preset loaded: %u\n", timestamp, 1);
      delay(1000);
}

void toJsonObject(char * outputBuffer, size_t bufSize) {
  uint8_t fgPalette = 185;
  StaticJsonDocument<200> doc;
  JsonObject object = doc.to<JsonObject>();
  object["fgPalette"] = fgPalette;
  serializeJson(doc, outputBuffer, bufSize);
}


void timeToString(char* string, size_t size)
{
  unsigned long nowMillis = millis();
  unsigned long seconds = nowMillis / 1000;
  int days = seconds / 86400;
  seconds %= 86400;
  byte hours = seconds / 3600;
  seconds %= 3600;
  byte minutes = seconds / 60;
  seconds %= 60;
  snprintf(string, size, "%02d:%02d:%02d:%02d", days, hours, minutes, seconds);
}