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4005CMD_Tutorial3/owntracks-publishing-subscribing
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import paho.mqtt.client as mqtt #necessary imports | |
import json, os | |
from datetime import date, datetime | |
import time | |
# sqlite3 | |
def on_log(client, userdata, level, buf): | |
print(buf) | |
def on_connect(client, userdata, flags, rc): | |
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 | |
client.loop_stop() | |
def on_disconnect(client, userdata, rc): | |
print("client disconnected ok") | |
""" callback function for messages published """ | |
def on_publish(client, userdata, mid): | |
print ("in on_pub callback mid= ", mid) | |
# client.loop_stop() | |
def on_subscribe(client, userdata, mid, granted_qos): | |
print("subscribed") | |
""" callback function for messages received """ | |
def on_message( client, userdata, msg, mid ): #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)), mid) | |
#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 | |
def reset (): | |
ret=client.publish("house/temperature1", "", 0, True) | |
#ret=client.publish("house/temperature1", "Test Message 0", 0) | |
mqtt.Client.connected_flag=False #create flag in class | |
client = mqtt.Client() | |
client.on_log=on_log | |
client.on_connect = on_connect | |
client.on_disconnect=on_disconnect | |
client.on_publish = on_publish | |
client.connect("broker.hivemq.com", 1883) #connect to the broker on an appropriate port | |
client.loop_start() | |
while not client.connected_flag: #wait in loop | |
print("in wait loop") | |
time.sleep(1) | |
time.sleep(3) | |
print("publishing") | |
ret=client.publish("house/temperature1", "Test Message 0", 0) | |
print("publish return=", ret) | |
time.sleep(3) | |
ret=client.publish("house/temperature1", "Test Message 1", 1) | |
print("publish return=", ret) | |
time.sleep(3) | |
ret=client.publish("house/temperature1", "Test Message 2", 2) | |
time.sleep(3) | |
client.subscribe("house/temperature1", 2) | |
time.sleep(10) | |
client.loop_stop() | |
client.disconnect() | |