Arduino firmware for this project

Libraries used:

• MQTT
• ArduinoJson
• WiFiNINA
• CustomJWT
• SAMD_TimerInterrupt
• ArduinoStreamUtils
• Sensirion sen5x
• Sensirion scd4x
• DS3231
• PMS
• Adafruit BME280
• SD
• NTP

To use this you must create a "secrets.h" in main/ for your network's SSID and password, and also your MQTT broker address and JWT secret:

#define NETWORK_SSID "SSID"
#define NETWORK_PASS "PASS"
#define MQTT_BROKER IPAddress(0, 0, 0, 0)
#define JWT_SECRET ""

This was only tested on an Arduino Nano 33 IoT, although it should work on any Arduino with a SAMD processor and an wifi/ethernet module or shield that's compatible with the WiFiNINA library.