publish.py

import Adafruit_DHT
import paho.mqtt.client as paho
broker="192.168.xx.xxx"

sensor = Adafruit_DHT.DHT11
pin = 4

humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)

def hum_temp():
        if humidity is not None and temperature is not None:
            return 'Temp={0:0.1f}*  Humidity={1:0.1f}%'.format(temperature, humidity)
        else:
            return 'Failed to get reading. Try again!'

client= paho.Client("control-001")
client.hum_temp=hum_temp
client.connect(broker)
client.publish("sensor_data",hum_temp())