Firebase IoT https://medium.com/@alexastrum/connect-arduino-nano-33-iot-to-firebase-rtdb-in-5-minutes-347ec6917da5 #1

display.h

void displayText(String msg) { Serial.println(msg); }

void blinkLED(int duration) {
  digitalWrite(LED_BUILTIN, HIGH);
  delay(duration);
  digitalWrite(LED_BUILTIN, LOW);
  delay(100);
}

void displayStatus(String msg) {
  displayText(msg);
  blinkLED(100);
}

void displayError(String msg) {
  displayText("Error: " + msg);
  blinkLED(300);
}

void displaySuspend(String msg) {
  displayText("Execution suspended: " + msg);
  digitalWrite(LED_BUILTIN, HIGH); // Turn on LED.
  while (true) {
    // Stop execution.
  }
}

void setupDisplay() {
  pinMode(LED_BUILTIN, OUTPUT);

  Serial.begin(115200);
  if (!Serial) {
    // Allow enough time for our Serial Monitor to connect to the serial port.
    delay(3000);
  }
  if (Serial) {
    Serial.println("\nSerial port connected.");
  }
}

FirebaseIoT.ino

// Make sure we've installed all needed libraries.
#include <WiFiNINA.h>
#include <ArduinoECCX08.h>
#include <ArduinoHttpClient.h>
#include <ArduinoJson.h>

#include "display.h"

void setup()
{
  setupDisplay();
}

void loop()
{
  displayStatus("Hello world!");
  delay(1000); // Wait for a second.
  displaySuspend("All done!");
}