Saving Mqtt Data From Subscribe Topic On A Text File

I am setting up to receive MQTT data from a subscribed topic and I want to save the data in a text file. I have added the code to save the variable to a text file. However this doe

Solution 1:

You should append data to file in on_message call back and obviously should connect then subscribe to topic

import paho.mqtt.client as mqttClient
import time

defon_connect(client, userdata, flags, rc):

    if rc == 0:

        print("Connected to broker")

        global Connected                #Use global variable
        Connected = True#Signal connectionelse:

        print("Connection failed")

defon_message(client, userdata, message):
    print"Message received: "  + message.payload
    withopen('/home/pi/test.txt','a+') as f:
         f.write("Message received: "  + message.payload + "\n")

Connected = False#global variable for the state of the connection

broker_address= "192.168.0.6"#Broker address
port = 1883#Broker port
user = "me"#Connection username
password = "abcdef"#Connection password

client = mqttClient.Client("Python")               #create new instance
client.username_pw_set(user, password=password)    #set username and password
client.on_connect= on_connect                      #attach function to callback
client.on_message= on_message                      #attach function to callback
client.connect(broker_address,port,60) #connect
client.subscribe("some/topic") #subscribe
client.loop_forever() #then keep listening forever

Now if you publish message on "some/topic" your code shall append data to the file