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import paho.mqtt.client as mqtt #necessary imports
import json, os
from datetime import date, datetime
import time
print("Hello, Visual Studio")
""" callback function for connection """
def on_connect(client, userdata, flags, rc): #client method to connect
if rc==0:
client.connected_flag = True #set flag
print("connected OK Returned code=",rc) #let us know we connected to the broker
client.subscribe("owntracks/KS/#") #we are connected, so subscribe to the topic. wildcard means any device
print("rc")
else:
print("Bad connection Returned code=",rc) #if we can't connect
""" callback function for messages received """
def on_message( client, userdata, msg ): #client method to get messages from topic
topic = msg.topic #for use when we can't decode
try:
data = json.loads(msg.payload.decode("utf8")) #decode message
day = date.today() #time functions
clock = datetime.now()
time = datetime.time(clock)
print ("TID = {0} is currently at {1}, {2},{3},{4}".format(data['tid'], data['lat'], data['lon'], str(day), str(time)))
#print device, latitude and longitude from the message; add time data
print(str(data)) #print the entire message just for fun
except:
print ("Cannot decode data on topic {0}".format(topic)) #cannot decode; print the topic for the non-decodable message
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.username_pw_set("KS", "mqttBROKER") #associate authentication details with the client
#client.tls_set("mqtt.coventry.ac.uk.crt") #certificate for client. needs to be in the same directory as this script
client.connect("broker.hivemq.com", 1883) #connect to the broker on an appropriate port
client.loop_forever() #keep looping forever (allows realtime subscription)
print("Here we are")
#def on_connect(client, userdata, flags, rc):
# print("Connected with result code "+str(rc))
# Subscribing in on_connect() means that if we lose the connection and
# reconnect then subscriptions will be renewed.
# client.subscribe("$SYS/#")
# The callback for when a PUBLISH message is received from the server.
#def on_message(client, userdata, msg):
# print(msg.topic+" "+str(msg.payload))
# client = mqtt.Client()
#client.on_connect = on_connect
#mqttBroker ="mqtt.eclipseprojects.io"
#client = mqtt.Client("Temperature_Inside")
#client.connect(mqttBroker)
#client.on_connect = on_connect
#client.on_message = on_message
print("message")