h.py

#!/usr/bin/python
import Adafruit_DHT

sensor = Adafruit_DHT.DHT22
pin = 26

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

if humidity is not None and temperature is not None:
    print('{0:0.0f}').format(humidity)
    #print('Temp={0:0.1f}*C  Humidity={1:0.1f}%'.format(temperature, humidity))

h.sh

#!/bin/bash

humidity=$(python ~/h.py)
# Regex to make sure $humidity is what I want it to be.
re='^[0-9]+([.][0-9]+)?$'

if ! [[ "$humidity" =~ $re ]] ; then
   echo "error: Not a number" >&2
   exit 1
else
    # Log a message to syslog
    logger -t humidity "sending over $humidity"
    if mosquitto_pub -h mqtt.home.gnulnx.net -p 8883 --cafile tls/ca.crt --cert tls/bedroom.crt --key tls/bedroom.key -t "environment/bedroom/humidity" -m "$humidity" -r; then
        logger -t humidity 'success'
    else
        logger -t humidity 'failure'
    fi
fi