owntrack-subscribe-publish.py

import paho.mqtt.client as mqtt #necessary imports
import json, os
from datetime import date, datetime
import time
import sys
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
def on_disconnect(client, userdata, rc):
7
 print("client disconnected ok")
#def on_publish(client, userdata, mid):
# print("In on_pub callback mid= " + str(mid))
 def on_subscribe(client,userdata,mid,qos):
 print("in on subscribe callback result "+str(mid))
 #for t in topic_ack:
 # if t[1]==mid:
 # t[2]=1 #set acknowledged flag
 # print("subscription acknowledged "+t[0])
 # client.suback_flag=True
 # client.loop_stop()

""" 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
mqtt.Client.connected_flag=False#create flag in class
client = mqtt.Client()
client.on_connect = on_connect
client.connect("broker.hivemq.com", 1883)
#client.on_subscribe=on_subscribe
client.on_disconnect = on_disconnect
#client.on_publish = on_publish
8

client.on_message = on_message
topic="house/lights/bulb1"
topic1="house/doors/door1" # The ONLY CHANGE from Question 2
print("Connecting to broker ","broker.hivemq.com")
try:
 client.connect("broker.hivemq.com") #connect to broker
except:
 print("can't connect")
 sys.exit(1)
client.loop_start() #Start loop
while not client.connected_flag: #wait in loop
 print("In wait loop")
time.sleep(1)
print("subscribing to topic ",topic)
ret= client.subscribe(topic,0)
print("subscribed returned ",ret)
msg="off" # The ONLY CHANGE from Question 2
ret= client.subscribe(topic,0)
print("subscribed returned ",ret)
time.sleep(4)
client.loop_stop() #Stop loop
client.disconnect() # disconnect
ADVANCED
Subscribe topics and populate a database with owntracks data