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Blynk MQTT client for Arduino

Arduino Framework, often used in conjunction with PlatformIO, is a popular platform for developing IoT and embedded projects due to its simplicity and open-source nature. Arduino provides an accessible introduction to hardware programming with a simplified IDE and a vast library ecosystem for various sensors and actuators.

PlatformIO extends Arduino's capabilities by offering an advanced, cross-platform IDE that supports multiple boards and frameworks, improving code management, and facilitating complex deployments. This combination is particularly suited for hobbyists, educators, and professionals prototyping IoT devices and embedded systems.

This example was verified to work with these boards:

  • Original Arduino boards:
    • Nano ESP32, Nano RP2040 Connect, Nano 33 IoT, MKR WiFi 1010, UNO R4 WiFi, Portenta C33, Opta WiFi
  • Espressif:
  • Raspberry Pi Pico W (RP2040 + CYW43439) via Arduino-Pico Core
  • Seeed Wio Terminal (ATSAMD51 + RTL8720DN) via Seeed Arduino Core

Prepare your Device in Blynk.Cloud

  1. Create Blynk template based on the provided blueprint. Click the Use Blueprint button in MQTT Air Cooler/Heater Demo.
  2. In the left panel, select Devices
  3. Click New Device button
  4. Select From Template -> MQTT Demo, and click Create

Note

Please note the device credentials that appear in the upper right corner. You'll need them in the next step.

Run the sample using Arduino IDE

  1. Install Arduino IDE
  2. Install the respective Arduino Core support package for your board
  3. Open Arduino_Blynk_MQTT/Arduino_Blynk_MQTT.ino using the Arduino IDE
  4. In arduino_secrets.h tab, fill-in your WiFi and Blynk device credentials
  5. Click Verify and Upload

Run the sample using PlatformIO

The provided platformio.ini contains pre-configured environments for each board type:

esp32, esp32c3, esp32c6, esp32s2, esp32s3, esp8266,
wio_terminal, unoR4wifi, rp2040connect, nano33iot,
mkrwifi1010, portentaC33, opta

In Arduino_Blynk_MQTT/arduino_secrets.h tab, fill-in your WiFi and Blynk device credentials.

Flash and open Serial Monitor:

pio run -e esp32 -t upload -t monitor

Serial Monitor output

    ___  __          __
   / _ )/ /_ _____  / /__
  / _  / / // / _ \/  '_/
 /____/_/\_, /_//_/_/\_\
        /___/

 Firmware ver:    0.0.1
 Build time:      Mar  3 2024 12:09:56
 Board:           esp32

Connecting to MyWiFiHotspot......... IP:192.168.1.123, RSSI:-45dBm
Connecting to blynk.cloud:8883... OK [secure]

Troubleshooting

  • On most original Arduino boards (Nano 33 IoT, MKR WiFi, etc.) you'll need to update the connectivity module firmware
    • Also, you need to upload SSL root certificates for blynk.cloud:8883
    • On Linux, the Arduino UNO R4 must be plugged into a hub usb to make the WiFi firmware/SSL certificates update process work. Otherwise, the board won’t reboot into the download mode.
  • If secure connection fails, you can also disable the security and check it this way.
    • To disable security, uncomment #define BLYNK_MQTT_UNSECURE in arduino_secrets.h
    • Warning: Using plain TCP is susceptible to data interception and manipulation; please use only for testing purposes in controlled environments.

Further reading