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Week2_Tutorial/owntracks-subscribe_for_ever_loop.py
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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), 0) #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") |