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4005CMD_Tutorial3/owntracks_publishing_subscribing_Q2_recording
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import paho.mqtt.client as mqtt #necessary imports | |
import json, os | |
from datetime import date, datetime | |
import time | |
def on_log(client, userdata,level, buf): #log the subscriber considering the buffer | |
print(buf) | |
""" Connect callback function """ | |
def on_connect(client, userdata, flags,rc): | |
if rc==0 | |
client.connected_flag=True #set the flag | |
print("connected OK Returned code =",rc) #let us know that 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) | |
print("client disconnected ok") | |
""" callback function for messaged published """ | |
def on_publish(client, userdata, mid): | |
print("in on_pub callback = ", mid) | |
""" callback function for Subscribing """ | |
def on_subscribe(client, userdata, mid, granted_qos): | |
print("subscribed") | |
""" callback function for client disconnected """ | |
def on_disconnect(client, userdata, rc): | |
print("client disconnected OK") | |
""" callback function for messages received """ | |
def on_message(client, userdata, msg, mid) #client method to get messages from topic | |
topic=msg.topic #to be used when we can't decode | |
try: | |
data=json.loads.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 longtitude from the message, add time data | |
print(str(data)) | |
except: | |
print("Cannot decode data on topic(0)".format(topic)) | |
def reset(): | |
ret=publish("house/temperature1", "", 0, True) | |
mqtt.Client.connected_flag=False #create the flag in the class | |
client=mqtt.Client() | |
cliet.on_log=on_log | |
client.on_connect=on_connect | |
client.on_disconnect=on_disconnect | |
client.on_publish=on_publish | |
client.connect("boker.hivemq.com", 1883) #connect to the broker on the appropriate port | |
client.on_loop_start() | |
while not client.connected_flag #wait in loop | |
print("in wait loop") | |
time.sleep(1) | |
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) | |
print("publish return=", ret) | |
time.sleep(3) | |
client.subscribe("house/temperature1",2) | |
time.sleep(10) | |
client.loop_stop() | |
client.disconnect() | |