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Week2_Tutorial/owntracks_mqtt_question1
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import paho.mqtt.client as mqtt #necessary imports | |
import json, os | |
from datetime import date, datetime | |
import time | |
""" 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): | |
topic=msg.topic | |
try: | |
data=json.loads(msg.payload.decode("utf8")) #decode the message | |
day=date.today() #time function | |
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("can not decode datat on topic(0)") | |
client=mqtt.Client() #define the client class | |
client.on_connect=on_connect | |
client.on_message=on_message | |
client.connect("broker.hivemq.com", 1883) | |
client.loop_forever() |