General discussion • Help: Connecting Raspberry Pi Pico W to AWS IoT Core

Code:

# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.# SPDX-License-Identifier: MIT-0# AWS IoT Core - RPi Pico W Demo# Required importsimport timeimport machineimport networkimport ujsonfrom umqtt.simple import MQTTClient[code][code][code]################################################################################## START CODE MODIFICATION ################################################################################################################################### Wifi Name / SSIDSSID = b'<your wifi network name>'# Wifi PasswordPASS = b'<your wifi password>'# AWS ThingName is used for the Client ID (Best Practice). Example: RaspberryPiPicoWCLIENT_ID = b'RaspberryPiPicoW'# AWS Endpoint (Refer to "Creating a Thing in AWS IoT Core" step 13)AWS_ENDPOINT = b'<your IoT Endpoint value here>'################################################################################## END CODE MODIFICATION ##################################################################################################################################### AWS IoT Core publish topicPUB_TOPIC = b'/' + CLIENT_ID + '/temperature'# AWS IoT Core subscribe  topicSUB_TOPIC = b'/' + CLIENT_ID + '/light'# Reading Thing Private Key and Certificate into variables for later usewith open('/certs/key.der', 'rb') as f:    DEV_KEY = f.read()# Thing Certificatewith open('/certs/cert.der', 'rb') as f:    DEV_CRT = f.read()# Define light (Onboard Green LED) and set its default state to offlight = machine.Pin("LED", machine.Pin.OUT)light.off()# Wifi Connection Setupdef wifi_connect():    print('Connecting to wifi...')    wlan = network.WLAN(network.STA_IF)    wlan.active(True)    wlan.connect(SSID, PASS)    while wlan.isconnected() == False:        light.on()        print('Waiting for connection...')        time.sleep(0.5)        light.off()        time.sleep(0.5)    print('Connection details: %s' % str(wlan.ifconfig()))# Callback function for all subscriptionsdef mqtt_subscribe_callback(topic, msg):    print("Received topic: %s message: %s" % (topic, msg))    if topic == SUB_TOPIC:        mesg = ujson.loads(msg)        if 'state' in mesg.keys():            if mesg['state'] == 'on' or mesg['state'] == 'ON' or mesg['state'] == 'On':                light.on()                print('Light is ON')            else:                light.off()                print('Light is OFF')# Read current temperature from RP2040 embeded sensordef get_rpi_temperature():    sensor = machine.ADC(4)    voltage = sensor.read_u16() * (3.3 / 65535)    temperature = 27 - (voltage - 0.706) / 0.001721    return temperature# Connect to wifiwifi_connect()# Set AWS IoT Core connection detailsmqtt = MQTTClient(    client_id=CLIENT_ID,    server=AWS_ENDPOINT,    port=8883,    keepalive=5000,    ssl=True,    ssl_params={'key':DEV_KEY, 'cert':DEV_CRT, 'server_side':False})# Establish connection to AWS IoT Coremqtt.connect()# Set callback for subscriptionsmqtt.set_callback(mqtt_subscribe_callback)# Subscribe to topicmqtt.subscribe(SUB_TOPIC)# Main loop - with 5 sec delaywhile True:    # Publisg the temperature    message = b'{"temperature":%s, "temperature_unit":"Degrees Celsius"}' % get_rpi_temperature()    print('Publishing topic %s message %s' % (PUB_TOPIC, message))    # QoS Note: 0=Sent zero or more times, 1=Sent at least one, wait for PUBACK    # See https://docs.aws.amazon.com/iot/latest/developerguide/mqtt.html    mqtt.publish(topic=PUB_TOPIC, msg=message, qos=0)    # Check subscriptions for message    mqtt.check_msg()    time.sleep(5)