---
title: "MQTT-Based LED Control with W55RP20-EVB-Pico: Beebotte IoT Integration Guide"
url: "https://maker.wiznet.io/Hannah/projects/mqtt-based-led-control-with-w55rp20-evb-pico-beebotte-iot-integration-guide/"
markdown_url: "https://maker.wiznet.io/Hannah/projects/mqtt-based-led-control-with-w55rp20-evb-pico-beebotte-iot-integration-guide/md"
type: "WCC: WIZnet Created Content"
author: "Hannah Lee"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "Hannah Lee"
published: "2025-03-28"
language: "en"
tags: ["MQTT", "W55RP20", "MicroPython"]
hardware: ["WIZnet W55RP20-EVB-Pico"]
likes: 0
views: 2778
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# MQTT-Based LED Control with W55RP20-EVB-Pico: Beebotte IoT Integration Guide

> Step-by-step tutorial to connect your W55RP20-EVB-Pico to Beebotte and control LEDs over MQTT.

Original author: Hannah Lee

## Components

- **WIZnet W55RP20-EVB-Pico** x 1 ([docs](https://wiznet.io/products/powered-by-raspberry-pi/w55rp20-evb-pico))
- Software: **thonny.org Thonny** ([docs](https://github.com/thonny/thonny/wiki))

## Article

### **Introduction**

In the era of IoT, controlling physical devices through cloud platforms has become a foundational skill. This tutorial demonstrates how to control an onboard LED on the **W55RP20-EVB-Pico** using **Beebotte**, a lightweight MQTT-based cloud service designed for real-time IoT applications.

Whether you're an IoT beginner or exploring alternatives to heavyweight cloud platforms like AWS or Azure, this guide walks you through every step — from hardware setup to cloud integration.

### **Core Hardware & Technology**

| Component | Description |
| --- | --- |
| **W55RP20-EVB-Pico** | W55RP20-EVB-Pico is an evaluation board for W55RP20, a chip that combines W5500, a wired TCP/IP controller, and RP2040 |
| **Beebotte** | MQTT-based cloud platform for real-time data and device control |
| **MQTT** | Lightweight publish-subscribe messaging protocol ideal for IoT |
| **LED (Onboard)** | Built-in LED on the Pico board for testing control logic |

### **Implementation**

🔌 Hardware Setup

- No additional wiring is required. We use the onboard LED.

- Connect W55RP20-EVB-Pico to your router via Ethernet.

🛠️ Software Prerequisites

- **Thonny**

- [**How to build WIZnet-ioNIC-micropython**](https://maker.wiznet.io/mason/projects/how%2Dto%2Dbuild%2Dwiznet%2Dionic%2Dmicropython/?page=4&serob=rt&serterm=year)

- **WIZnet Ethernet library**

- **MQTT client library** (umqttsimple.py)

☁️ Beebotte Configuration

1. Sign up at <https://beebotte.com>

2. Create a **channel** (e.g., `W55RP20EVBPico`)

3. Add a **resource** (e.g., `led`) of type `boolean`![](https://maker.wiznet.io/upload/ckeditor5/1070690960%5F1742826520%2Epng)

4. Save your **Channel Token** and **Channel Name![](https://maker.wiznet.io/upload/ckeditor5/1070690960%5F1742826642%2Epng)**

5. Create a Dashboard

6. Add On/Off Widget to Control the LED![](https://maker.wiznet.io/upload/ckeditor5/1070690960%5F1742826879%2Epng)![](https://maker.wiznet.io/upload/ckeditor5/1070690960%5F1742826890%2Epng)![](https://maker.wiznet.io/upload/ckeditor5/1070690960%5F1742826906%2Epng)

#### 🧠 Code Logic

```python
import network
import time
import ujson
import urandom
from machine import Pin, WIZNET_PIO_SPI
from umqtt.simple import MQTTClient

# 핀 설정
LEDPIN = Pin(19, Pin.OUT)

# Beebotte MQTT 설정
BBT = "mqtt.beebotte.com"
TOKEN = "token_"
CHANNEL = "W55RP20EVBPico"
LED_RESOURCE = "led"

# MQTT 클라이언트 생성
client = None

#W5x00 chip init
def w5x00_init():
    spi = WIZNET_PIO_SPI(baudrate=31_250_000, mosi=Pin(23),miso=Pin(22),sck=Pin(21)) #W55RP20 PIO_SPI
    nic = network.WIZNET5K(spi,Pin(20),Pin(25)) #spi,cs,reset pin
    nic.active(True)
    
#None DHCP
    nic.ifconfig(('192.168.11.20','255.255.255.0','192.168.11.1','8.8.8.8'))
    
    #DHCP
    #nic.ifconfig('dhcp')
    
    print('IP address :', nic.ifconfig())
    while not nic.isconnected():
        time.sleep(1)
        print(nic.regs())
    

def generate_id(length=16):
    """랜덤 ID 생성"""
    chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
    return ''.join(chars[urandom.getrandbits(6) % len(chars)] for _ in range(length))


def sub_callback(topic, msg):
    """MQTT 메시지 수신 콜백"""
    print("Received:", topic, msg)
    try:
        data = ujson.loads(msg)
        led_state = data.get("data", 0)

        if led_state:
            LEDPIN.on()
        else:
            LEDPIN.off()
        print(f"LED 상태 변경: {'ON' if led_state else 'OFF'}")
    except Exception as e:
        print("JSON Parsing Error:", e)


def mqtt_connect():
    """MQTT 서버에 연결"""
    global client
    client = MQTTClient(generate_id(), BBT, 1883, TOKEN, "")
    client.set_callback(sub_callback)
    
    try:
        client.connect()
        topic = f"{CHANNEL}/{LED_RESOURCE}"
        client.subscribe(topic)
        print(f"Connected to Beebotte MQTT, subscribed to {topic}")
        return True
    except Exception as e:
        print("MQTT 연결 실패:", e)
        return False


def main():
    """메인 실행 함수"""
    global client

    # 이더넷 초기화
    w5x00_init()

    # MQTT 연결 시도
    while not mqtt_connect():
        print("MQTT 재연결 중...")
        time.sleep(5)

    last_reconnect_attempt = time.time()

    while True:
        try:
            client.check_msg()  # 새로운 메시지 확인
        except Exception as e:
            print("MQTT 오류:", e)

            # 재연결 로직
            if time.time() - last_reconnect_attempt > 5:
                print("MQTT 재연결 시도 중...")
                last_reconnect_attempt = time.time()
                if mqtt_connect():
                    last_reconnect_attempt = 0

        time.sleep(1)


if __name__ == "__main__":
    main()
```

---

Source: https://maker.wiznet.io/Hannah/projects/mqtt-based-led-control-with-w55rp20-evb-pico-beebotte-iot-integration-guide/