Communication with AWS Server

Victor Lucio

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("Connected")
else:
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")
mqttc.loop_start()

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)
time.sleep(10)

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.

crispyoz

@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.

https://community.onion.io/topic/3691/omega2-aws-connect-error-ssl-certificate-verify-failed/7

Victor Lucio

@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.disconnect()

client.on_publish = on_publish"

crispyoz

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