1w2mqtt.py

#!/usr/bin/env python

#
#Copyright (c) 2015, Joshua Smith
#All rights reserved.
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"""
1w2mqtt.py - Publish temperature readings from a 1 wire temperature sensor as an mqtt message.

Command Line Arguments:

-b --broker, Broker wihch 1w2mqtt should connect. 
-d --delay, Delay between sensor readings.
-t --topic, Base topic which 1w2mqtt should publish messages.
-v --verbose, Enable Verbose output.
"""

from w1thermsensor import W1ThermSensor
import argparse
import logging
import paho.mqtt.publish as publish
import time

#parse command line arguments
parser = argparse.ArgumentParser()
parser.add_argument("-b", "--broker", help="Broker to connect.", default="localhost")
parser.add_argument("-d", "--delay", help="Time to delay between sensor readings.", type=int, default=5)
parser.add_argument("-v", "--verbose", help="Enable Verbose output.", action="store_true")


args = parser.parse_args()

if args.verbose:
	logging.basicConfig(level=logging.DEBUG)

logging.debug("Additional Verbosity Enabled.")


while True:
	#get a list of sensors:
	sensors = W1ThermSensor.get_available_sensors()
	if len(sensors) == 0:
		logging.warn("No Sensors Found.  Please configure at least one sensor.")
		time.sleep(args.delay)
		continue

	for sensor in sensors:
		try:
			reading = sensor.get_temperature()
			logging.debug ("Sensor %s has temp %f at %f" % (sensor.id, reading,time.time()))
		except:
			logging.error("Error reading sensor %s." % (sensor.id))
			continue
			


		try:
			publish.single("sensors/temperature/%s" % sensor.id, "%s %s" % (reading,time.time()), hostname=args.broker)
		
		except:
			logging.error("Error connecting to %s." % args.broker)
			continue

	time.sleep(args.delay)