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

Here's a non-blocking MQTT client for your Raspberry Pi Pico W that blinks an LED while polling and holds it solid for 1 second when a message arrives: 

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import machine
import time
from umqtt.simple import MQTTClient

# Configure LED and initial state
led = machine.Pin("LED", machine.Pin.OUT)
led.off()

# MQTT Configuration
MQTT_BROKER = "broker.hivemq.com"  # Replace with your broker
CLIENT_ID = "pico_client"
TOPIC = "pico/led"  # Replace with your topic

# State variables
led_solid = False
last_message_time = 0

def mqtt_callback(topic, msg):
    global led_solid, last_message_time
    led.value(1)
    led_solid = True
    last_message_time = time.ticks_ms()

# MQTT Setup
client = MQTTClient(CLIENT_ID, MQTT_BROKER)
client.set_callback(mqtt_callback)
client.connect()
client.subscribe(TOPIC)

# Main loop
while True:
    # Non-blocking MQTT check
    client.check_msg()
    
    # Handle LED state
    if led_solid:
        # Check if 1 second has passed since message
        if time.ticks_diff(time.ticks_ms(), last_message_time) >= 1000:
            led_solid = False
            led.off()
    else:
        # Blink LED every iteration
        led.toggle()
    
    # Short delay to maintain blink visibility
    time.sleep(0.1)
Key features: - Uses non-blocking `check_msg()` for MQTT - Blinks LED at 0.2Hz (5 seconds per full cycle) while idle - Sets LED solid for 1 second on message receipt - Handles message timing with hardware ticks for accuracy - Maintains MQTT connection while blinking To use this: 1. Replace `MQTT_BROKER` with your broker address 2. Replace `TOPIC` with your desired subscription topic 3. Ensure the `umqtt.simple` library is on your Pico 4. The LED will blink while waiting for messages 5. Publish any message to your topic to trigger the solid LED Note: The LED blink rate can be adjusted by changing the `time.sleep(0.1)` value, but keep it above 0.05s for visible blinking.

Check if all of the following conditions are true:

Substring Evaluation

Testing if the previous output contains the string STA_IF: False

Substring Evaluation

Testing if the previous output contains the string WLAN: False

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: False