Best posts made by kulmam92

I was able to send data to AWS IoT Core using the below code. If you want to run this code from VScode + Pymakr, follow this guide: MicroPython: Program ESP32/ESP8266 using VS Code and Pymakr

import network
from umqtt.simple import MQTTClient
import time
import sys
import os
import json

# configure your wifi credentials
WIFI_SSID = "<YOUR_WIFI_SSID_GOES_HERE>"
WIFI_PASS = "<YOUR_WIFI_PASSWORD_GOES_HERE>"

# configure your iot credentials
MQTT_ENDPOINT = "XXXXXX.iot.XXXXX.amazonaws.com"
MQTT_PORT = 8883
MQTT_QOS = 0
# thing-id
MQTT_CLIENT = "mycore2"

THING_CLIENT_CERT = "/flash/res/core2-certificate.pem.crt"
THING_PRIVATE_KEY = "/flash/res/core2-private.pem.key"

# topic
MQTT_TOPIC = "mycore2/env"
MQTT_SUB_TOPIC = "mycore2/command"

info = os.uname()

def connect_to_wifi(ssid, password):
    sta_if = network.WLAN(network.STA_IF)
    if not sta_if.isconnected():
        sta_if.active(True)
        sta_if.connect(ssid, password)
        while not sta_if.isconnected():
            pass
    ip_address = sta_if.ifconfig()[0]
    return ip_address

def get_key(key_path):
    with open(key_path, "r") as f:
        key = f.read()
    return key

def connect_to_mqtt():
    print("CONNECTING TO MQTT BROKER...")
    global client
    client = MQTTClient(
        client_id=MQTT_CLIENT,
        server=MQTT_ENDPOINT,
        port=MQTT_PORT,
        keepalive=0,
        ssl=True,
        ssl_params={
            "cert": get_key(THING_CLIENT_CERT),
            "key": get_key(THING_PRIVATE_KEY),
            "server_side": False
        }
    )
    client.set_callback(subscription_call_back)
    try:
        client.connect()
        print("MQTT BROKER CONNECTION SUCCESSFUL")
    except Exception as e:
        print("MQTT CONNECTION FAILED: {}".format(e))
        sys.exit()
    client.subscribe(MQTT_SUB_TOPIC)
    print("SUBSCRIBED TO TOPIC: {}".format(MQTT_SUB_TOPIC))
    return

def subscription_call_back(topic, msg):
    # confirm state update
    print("RECEIVING MESSAGE: {} FROM TOPIC: {}".format(
        msg.decode("utf-8"), topic.decode("utf-8")))
    return

def publish_message(topic, msg, qos=MQTT_QOS):
    client.publish(
        topic=topic,
        msg=msg,
        qos=qos)
    print("PUBLISHING MESSAGE: {} TO TOPIC: {}".format(msg, topic))
    return

# connect to wifi
print("CONNECTING TO WIFI NETWORK")
ip_address = connect_to_wifi(WIFI_SSID, WIFI_PASS)
print("CONNECTED SUCCESSFULLY")
print("YOUR IP ADDRESS IS: {}".format(ip_address))

# connect to mqtt
print("CONNECTING TO MQTT BROKER")
connect_to_mqtt()
print("SUBSCRIBED TO TOPIC")
while True:
    client.check_msg()

    tf = power.getTempInAXP192()
    msg = str(json.dumps({
        "client": MQTT_CLIENT,
        "device": {
            "uptime": time.ticks_ms(),
            "hardware": info[0],
            "firmware": info[2]
        },
        "sensors": {
            "TempInAXP192": tf
        },
        "status": "online",
    }))
    publish_message(MQTT_TOPIC, msg)
    time.sleep(5)