Initial Query

Write a python program that I can use to run on my raspberry pi pico w zero that will check for mqtt messages. Don't block, and blink the LED on every loop iteration so I know it's polling. When it gets a message then set the LED solid for a second.

LLM Generation

Query

Write a python program that I can use to run on my raspberry pi pico w zero that will check for mqtt messages. Don't block, and blink the LED on every loop iteration so I know it's polling. When it gets a message then set the LED solid for a second.

Output

**Raspberry Pi Pico W MQTT Client** ===================================== This program connects to an MQTT broker, subscribes to a topic, and checks for incoming messages without blocking. It blinks the LED on every loop iteration to indicate it's polling. When a message is received, the LED is set solid for a second. **Prerequisites:** * Raspberry Pi Pico W * MicroPython firmware (version 1.20 or later) * MQTT broker (e.g., Mosquitto) * Wi-Fi connection **Code:** 

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import machine
import network
import time
import umqtt.robust

# LED pin
led = machine.Pin(25, machine.Pin.OUT)

# Wi-Fi credentials
WIFI_SSID = 'your_wifi_ssid'
WIFI_PASSWORD = 'your_wifi_password'

# MQTT broker settings
MQTT_BROKER = 'your_mqtt_broker_url'
MQTT_PORT = 1883
MQTT_TOPIC = 'your_mqtt_topic'

# Connect to Wi-Fi
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(WIFI_SSID, WIFI_PASSWORD)
while not wlan.isconnected():
    pass

# Connect to MQTT broker
client = umqtt.robust.MQTTClient('pico_w', MQTT_BROKER, MQTT_PORT)
client.connect()

# Subscribe to topic
client.set_callback(lambda topic, msg: print(f'Topic: {topic}, Message: {msg}'))
client.subscribe(MQTT_TOPIC)

# Blink LED on every loop iteration
def blink_led():
    led.value(1)
    time.sleep(0.1)
    led.value(0)

# Main loop
while True:
    # Blink LED
    blink_led()

    # Check for MQTT messages
    try:
        client.check_msg()
    except umqtt.robust.MQTTException as e:
        print(f'MQTT error: {e}')

    # Set LED solid for a second when a message is received
    if client.msg_available():
        led.value(1)
        time.sleep(1)
        led.value(0)
**Explanation:** 1. The program connects to a Wi-Fi network using the `network` module. 2. It then connects to an MQTT broker using the `umqtt.robust` module. 3. The program subscribes to an MQTT topic and sets a callback function to print incoming messages. 4. The main loop blinks the LED on every iteration using the `blink_led` function. 5. The program checks for MQTT messages using the `client.check_msg()` method. 6. If a message is available, the LED is set solid for a second. **Note:** * Replace the placeholders (`your_wifi_ssid`, `your_wifi_password`, `your_mqtt_broker_url`, and `your_mqtt_topic`) with your actual Wi-Fi credentials and MQTT broker settings. * Make sure to install the `umqtt.robust` module using the MicroPython package manager (upip) before running this program. * This program assumes you have a working MQTT broker and Wi-Fi connection.

Check if all of the following conditions are true:

Substring Evaluation

Testing if the previous output contains the string STA_IF: True

Substring Evaluation

Testing if the previous output contains the string WLAN: True

Substring Evaluation

Testing if the previous output contains the string set_callback: True

Substring Evaluation

Testing if the previous output contains the string MQTTClient: True

Substring Evaluation

Testing if the previous output contains the string check_msg: True

Final Answer: True