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

To create a Python program for your Raspberry Pi Pico W that checks for MQTT messages without blocking, blinks the LED on every loop iteration, and sets the LED solid for a second when a message is received, you can use the `umqtt.simple` library for MQTT and the `machine` library for controlling the LED. Here’s a sample program: 

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
import machine
import time
from umqtt.simple import MQTTClient

# Define the LED pin
led = machine.Pin("LED", machine.Pin.OUT)

# MQTT configuration
MQTT_BROKER = "your_mqtt_broker_address"
MQTT_CLIENT_ID = "pico_w_client"
MQTT_TOPIC = "your_topic"

# Callback function to handle incoming messages
def mqtt_callback(topic, msg):
    print(f"Message received on topic {topic}: {msg}")
    led.value(1)  # Turn LED on
    time.sleep(1)  # Keep LED on for 1 second
    led.value(0)  # Turn LED off

# Initialize MQTT client
client = MQTTClient(MQTT_CLIENT_ID, MQTT_BROKER)
client.set_callback(mqtt_callback)
client.connect()
client.subscribe(MQTT_TOPIC)

# Main loop
try:
    while True:
        # Blink the LED to indicate polling
        led.value(1)
        time.sleep(0.1)
        led.value(0)
        time.sleep(0.1)
        
        # Check for MQTT messages
        client.check_msg()
        
except KeyboardInterrupt:
    print("Program interrupted")
finally:
    client.disconnect()
### Explanation: 1. **LED Control**: The LED is controlled using the `machine.Pin` class. The LED blinks on every loop iteration to indicate that the program is polling for messages. 2. **MQTT Setup**: The MQTT client is initialized with the broker address, client ID, and topic. The `mqtt_callback` function is set to handle incoming messages. 3. **Main Loop**: The main loop continuously blinks the LED and checks for MQTT messages using `client.check_msg()`. If a message is received, the callback function is triggered, which turns the LED on for 1 second. 4. **Non-Blocking**: The program is non-blocking, meaning it continues to blink the LED and check for messages without getting stuck in any operation. ### Notes: - Replace `"your_mqtt_broker_address"` and `"your_topic"` with your actual MQTT broker address and topic. - Ensure that the `umqtt.simple` library is available on your Raspberry Pi Pico W. You may need to install it if it’s not already present. ### Running the Program: 1. Copy the code into a file, e.g., `main.py`. 2. Upload the file to your Raspberry Pi Pico W. 3. Run the program on the Pico W. This program will continuously blink the LED while polling for MQTT messages and will set the LED solid for a second when a message is received.

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