http://www.dingostick.com/2019/07/internet-of-things-air-conditioning.html

outside-temperature-query.py

#!/usr/bin/env python
import paho.mqtt.client as mqtt
import json
import requests

BROKER = '192.168.0.1'
TOPIC = "weather/renton"
URL = "http://api.openweathermap.org/data/2.5/weather?id=5808189&APPID=<your api key goes here>"
API_DELAY_SEC = 60 * 10 # every 10 minutes

# OpenWeatherMap reports temps in Kelvin, apparently ¯\_(ツ)_/¯
k_to_f = lambda k: (k - 273.15)*1.8 + 32

def query_weather():
    try:
       req = requests.get(URL)
       body = req.text
       result = json.loads(body)
       return result
    except:
        return None

def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))

if __name__ == '__main__':
    client = mqtt.Client()
    client.on_connect = on_connect
    client.connect(BROKER, 1883, 60)

    weather = query_weather()
    if weather is not None:
       temp_k = weather['main']['temp']
       temp_f = k_to_f(temp_k)

       print("Publishing current temp (%f) to topic '%s'" % (temp_f, TOPIC))
       client.publish(TOPIC, temp_f)