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Week2_Tutorial/owntrack-subscribe-publish.py
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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 |