IOTstack support for apcupsd-mqtt

readme.md

File structure is :

IOTstack/services/apcupsd-mqtt/Dockerfile
IOTstack/services/apcupsd-mqtt/service.yml
IOTstack/services/apcupsd-mqtt/apcupsd-mqtt.env (may not be required?) IOTstack/services/apcupsd-mqtt/src/apcupsd-mqtt.py
IOTstack/services/apcupsd-mqtt/src/requirements.txt

Things to fix:

1. Where to enter MQTT credentials? Use env file?

Currently I added them directly to apcupsd-mqtt.py in services/apcupsd-mqtt/src dir, which is not ideal:

Here are my settings from apcupsd-mqtt.py

MQTT_USER = os.getenv('MQTT_USER')
MQTT_PASSWORD = os.getenv('MQTT_PASSWORD')
MQTT_PORT = int(os.getenv('MQTT_PORT', 1883))
MQTT_HOST = os.getenv('MQTT_HOST', '192.168.107.99')
INTERVAL = float(os.getenv('INTERVAL', 15))
UPS_ALIAS = os.getenv('UPS_ALIAS',socket.gethostname())
APCUPSD_HOST = os.getenv('APCUPSD_HOST','192.168.107.99')
LOG_LEVEL = os.getenv('LOG_LEVEL',logging.INFO)
logger.setLevel(LOG_LEVEL)

2. Installation error to fix (add to Dockerfile?) " Fatal Python error: can't initialize time":

Manual fix for now (https://docs.linuxserver.io/faq) :

wget http://ftp.us.debian.org/debian/pool/main/libs/libseccomp/libseccomp2_2.4.4-1~bpo10+1_armhf.deb
then
sudo dpkg -i libseccomp2_2.4.4-1~bpo10+1_armhf.deb

apcupsd-mqtt.py

#!/usr/bin/python
import os
import time
from prettytable import PrettyTable
import paho.mqtt.client as paho
from apcaccess import status as apc
import logging
import socket
import pyfiglet



logger = logging.getLogger()
handler = logging.StreamHandler()
formatter = logging.Formatter(
    '%(asctime)s %(name)-12s %(levelname)-8s %(message)s')
handler.setFormatter(formatter)
logger.addHandler(handler)
logger.setLevel(logging.DEBUG)
logger.setLevel(logging.INFO)

MQTT_USER = os.getenv('MQTT_USER')
MQTT_PASSWORD = os.getenv('MQTT_PASSWORD')
MQTT_PORT = int(os.getenv('MQTT_PORT', 1883))
MQTT_HOST = os.getenv('MQTT_HOST', 'localhost')
INTERVAL = float(os.getenv('INTERVAL', 15))
UPS_ALIAS = os.getenv('UPS_ALIAS',socket.gethostname())
APCUPSD_HOST = os.getenv('APCUPSD_HOST','127.0.0.1')
LOG_LEVEL = os.getenv('LOG_LEVEL',logging.INFO)
logger.setLevel(LOG_LEVEL)


t = PrettyTable(['Key','Value'])
t.add_row(['MQTT_USER', MQTT_USER])
t.add_row(['MQTT_PASSWORD', MQTT_PASSWORD])
t.add_row(['MQTT_HOST', MQTT_HOST])
t.add_row(['INTERVAL', INTERVAL])
t.add_row(['UPS_ALIAS', UPS_ALIAS])
t.add_row(['ACPUPSD_HOST', APCUPSD_HOST])
t.add_row(['LOG_LEVEL', LOG_LEVEL])

def pub_mqtt( topic, value):
    """
    Publishes a new value to a mqtt topic.
    :param topic: 
    :param value: 
    :return: nothing
    """
    value =  str(value)
    client1 = paho.Client("control1")  # create client object
    #if MQTT_USER is not None and MQTT_PASSWORD is not None:
    client1.username_pw_set(MQTT_USER,MQTT_PASSWORD)
    try:
        client1.connect(MQTT_HOST, MQTT_PORT)  # establish connection
    except:
        logger.error("unable to connect to mqtt on %s:%i" % (MQTT_HOST, MQTT_PORT))

    #logger.info("mqtt topic updated: topic: " + topic + " | value: " + value)

    return client1.publish(topic, value)

def main():
    MQTT_TOPIC_PREFIX="/apcupsd"
    ups = apc.parse(apc.get(host=APCUPSD_HOST))
    HOSTNAME = ups.get('HOSTNAME', 'apcupsd-mqtt')
    MQTT_TOPIC_PREFIX = MQTT_TOPIC_PREFIX + "/" + UPS_ALIAS + "/"

    first_run = True
    logger.info("Printing first submission for debug purposes:")


    result = pyfiglet.figlet_format("apcupsd-mqtt")
    print( result )
    while True:
        ups_data = apc.parse(apc.get(host=APCUPSD_HOST), strip_units=True)
        try:
            max_watts = float(ups_data.get('NOMPOWER', 0.0))
            current_percent = float(ups_data.get('LOADPCT', 0.0))
            current_watts = ((max_watts*current_percent)/100)
            ups_data['WATTS'] = current_watts

        except:
            logger.error("unable to conjure up the watts. @brandon you're bad at maths.")
#        watts = float(os.getenv('WATTS', ups.get('NOMPOWER', 0.0))) * 0.01 * float(ups.get('LOADPCT', 0.0))

        for k in ups_data:
            topic_id = MQTT_TOPIC_PREFIX + str(k)
            if first_run:
                logger.info("%s = %s" % (topic_id, str(ups_data[k])))
            pub_mqtt( topic_id, str(ups_data[k]) )
        if first_run:
            logger.info("end first_run debug")
            first_run = False
        time.sleep(INTERVAL)


if __name__ == '__main__':
    main()

Dockerfile

FROM python:3-alpine
MAINTAINER Brandon <[email protected]>

USER root
COPY ./src /src
RUN pip install -r /src/requirements.txt \
    && chown -R 1001:1001 /src

USER 1001
WORKDIR ["/src"]

CMD ["python", "/src/apcupsd-mqtt.py"]

requirements.txt

PrettyTable
apcaccess
paho-mqtt
pyfiglet

Sample apcupsd-mqtt.env

TZ=Europe/London
MQTT_USER = 
MQTT_PASSWORD = 
MQTT_PORT = 1883
MQTT_HOST = localhost
INTERVAL = 15
UPS_ALIAS = socket.gethostname()
APCUPSD_HOST = 127.0.0.1

service.yml

  apcupsd-mqtt:
    build: ./services/apcupsd-mqtt/.
    container_name: apcupsd-mqtt
    restart: unless-stopped
    # Volumes not used as no persistent data required
    #volumes:
    #  - ./volumes/apcupsd-mqtt/data:/src