问题
I am trying to publish a file to AWS IoT using Mosquitto and python. The file i need to publish is a jpg file that is in my local directory. I have secret key and access key that are required to publish data to IoT. I am very new to programming and don't know how to write this program. can someone help me please? I apologize if this is something very basic. Thank you
I have already tried this How can I publish a file using Mosquitto in python? and did not work for me.
This is how i tired to do.
> #!/usr/bin/python
import mosquitto import sys
import ssl
import paho.mqtt.client as mqtt
f = open("data")
imagestring = f.read()
byteArray = bytes(imagestring)
client.publish("photo", byteArray ,0)
#called when a message is received by a topic
def on_message(mqttc, obj, msg):
print("Received message from topic: "+msg.topic+" | QoS: "+str(msg.qos)+"Data Received: "+str(msg.payload))
#creating a client with client-id=mqtt-test
mqttc = mqtt.Client(client_id="mqtt-test")
mqttc.on_connect = on_connect
mqttc.on_subscribe = on_subscribe
mqttc.on_message = on_message
#Configure network encryption
mqttc.tls_set("/home/username/root-CA.crt",
certfile="/home/username/6fdda68178-certificate.pem.crt",
keyfile="/home/username/6fdda68178-private.pem.key",
tls_version=ssl.PROTOCOL_TLSv1_2,
ciphers=None)
#connecting to aws-account-specific-iot-endpoint
mqttc.connect("A2DL8ZE59089FKF.iot.us-west-2.amazonaws.com", port=8883)
#the topic to publish to
mqttc.subscribe("$aws/things/mqtt-listener/shadow/update/#", qos=1)
#automatically handles reconnecting
mqttc.loop_forever()
回答1:
It looks like you have some things backwards in your code, or at least hard to understand. Here's an example of some working code to upload a binary file to AWS IOT.
#!/usr/bin/python
import paho.mqtt.client as paho
import os
import socket
import ssl
from time import sleep
from random import uniform
connflag = False
def on_connect(client, userdata, flags, rc):
global connflag
connflag = True
print("Connection returned result: " + str(rc))
mqttc = paho.Client()
mqttc.on_connect = on_connect
awshost = "YOURAWSHOST.iot.us-west-2.amazonaws.com"
awsport = 8883
caPath = "root-CA.crt"
certPath = "YOURCERT.pem.crt"
keyPath = "YOURKEY.pem.key"
mqttc.tls_set(caPath, certfile=certPath, keyfile=keyPath, cert_reqs=ssl.CERT_REQUIRED, tls_version=ssl.PROTOCOL_TLSv1_2, ciphers=None)
mqttc.connect(awshost, awsport, keepalive=60)
mqttc.loop_start()
while 1==1:
sleep(0.5)
f = open('mybinaryfile')
imagestring = bytearray(f.read())
f.close()
message = '"image": { "bytearray": "' + imagestring + '"} } '
mqttc.publish("$aws/things/rpi/shadow/update", message, qos=1)
Keep in mind that your published messages need to be SMALL - 128KB is the max size. If you have large images, you'll likely need to loop over your image and read it into chunks that are smaller than 128KB (+ overhead), and upload multiple images to AWS IOT for each image until you get the entire thing uploaded.
-Ray
来源:https://stackoverflow.com/questions/35882134/how-can-i-publish-file-to-aws-iot-using-mosquitto-in-python