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Communication with AWS Server

  • I want to send date that I recived from a Oxygen sensor(SDS011) using serial port. I want to send this values to the Amazon server using MQTT. My main code is the next:

    print("Importing Library")
    import time
    import sys  
    import datetime
    import paho.mqtt.client as paho
    import ssl
    import os
    import json
    print("Importing Done")
    def on_connect(client, userdata, flags, rc):
    global connflag
    connflag = True
    if rc == 0:
    print("Connection returned result: " + str(rc) )
    def on_message(client, userdata, msg):
    print(msg.topic+" "+str(msg.payload))
    mqttc = paho.Client("Omega-C11B")
    mqttc.on_connect = on_connect
    mqttc.on_message = on_message
    print("Paho Client Setup Done")
    awshost = "a3rzs5flqm8tjk-ats.iot.ap-south-1.amazonaws.com"
    awsport = 8883
    clientId = "Omega-C11B"
    thingName = "Omega-C11B"
    caPath = "/root/root-CA.crt"
    certPath = "/root/496d95a10e-certificate.pem.crt"
    keyPath = "/root/496d95a10e-private.pem.key"
    mqttc.tls_set(caPath, certfile=certPath, keyfile=keyPath, cert_reqs=ssl.CERT_REQUIRED, 
    tls_version=ssl.PROTOCOL_TLSv1_2, ciphers=None)
    print("TLS Established")
    mqttc.connect(awshost, awsport, keepalive=60)
    print("Server Connected")
    while True:
    humidity = 60 #Supposing Data
    temperature = 30  #Supposing Data
    t = time.time();
    date = datetime.datetime.fromtimestamp(t).strftime('%Y%m%d%H%M%S')
    mqttc.publish("$aws/things/Omega-CF2D/shadow/update/", json.dumps({"time": date, 
        "temperature": temperature, "humidity": humidity}), qos=1)

    In my console I get that the connection was sucefull, but when I see the AWS server, I can´t find the data. I don't know if it's due to a code problem or caPath Certificate, beacuse I don't know where I can find. So I get it forn this link link text. In my console I get :


    I'm sending data with a time to 10seconds.

  • @Victor-Lucio Take a look at my response in this thread. Paho is not great at exposing errors if you don't use the callbacks.


  • @crispyoz Which others changes I need to do?
    Thanks for responding 😉


    Could you explain me, what de you tried to say in this " I would also implement the on_publish callback.

    ¿This? Sorry if my question it's basic- I´m new using this module and sendding data to AWS.
    def on_publish(client, userdata, mid):
    print("Message published: " + message)

    # message published, disconnect

    client.on_publish = on_publish"

  • @Victor-Lucio your on_log should print the buffer, it has no parameter named msg. buffer should contain any errors or warnings.

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