Get temperature, humidity values from from https://openweathermap.org/ (OpenWeatherMap) and send it to your MQTT broker
I did not find anything as simple as sending the data to a MQTT broker so I had to build it with python.
You simply need Python3 (never tested with Python2.7) and the only dependencies are requests (to access the api) and paho-mqtt (for MQTT broker interaction) so this line should be enough :
pip3 install paho-mqtt requestsFirst you'll have to get tour API Key. Then you can use the demo to find the city's ID you're interested in.
Easy, first try a dry-run command :
./owm2mqtt.py -c '<CITY_ID>' -a '<API_KEY>' -n -vand then a real command to add to your crontab :
./owm2mqtt.py -c '<CITY_ID>' -a '<API_KEY>'The secrets can also be set with environment variables, see the help for more detail.
/ # owm2mqtt.py --help
usage: owm2mqtt.py [-h] -a OWMAPIKEY -c CITY [-m HOST] [-n]
[-o PREVIOUSFILENAME] [-t TOPIC] [-T TOPIC] [-v]
Read current temperature and humidity from OpenWeatherMap and send them to a
MQTT broker.
optional arguments:
-h, --help show this help message and exit
-a OWMAPIKEY, --owm-api-key OWMAPIKEY
OpenWeatherMap API Key. (default: None)
-c CITY, --city CITY OpenWeatherMap city ID. (default: None)
-m HOST, --mqtt-host HOST
Specify the MQTT host to connect to. (default:
127.0.0.1)
-n, --dry-run No data will be sent to the MQTT broker. (default:
False)
-o PREVIOUSFILENAME, --last-time PREVIOUSFILENAME
The file where the last timestamp coming from OWM API
will be saved (default: /tmp/owm_last)
-t TOPIC, --topic TOPIC
The MQTT topic on which to publish the message (if it
was a success). (default: sensor/outdoor)
-T TOPIC, --topic-error TOPIC
The MQTT topic on which to publish the message (if it
wasn't a success). (default: error/sensor/outdoor)
-v, --verbose Enable debug messages. (default: False)
I personaly use cron to start this program so as I want to keep the latest timestamp received from the API, I store it by default in /tmp/owm_last (you can change it through a command line parameter).
I added a sample Dockerfile, I personaly use it with a docker-compose.yml like this one :
version: '3'
services:
owm:
build: https://github.com/seblucas/owm2mqtt.git
image: owm2mqtt-python3-cron:latest
restart: always
environment:
OWM_API_KEY: YOUR_API_KEY
OWM_CITY_ID: "YOUR_CITY_ID"
CRON_STRINGS: "09 * * * * owm2mqtt.py -m localhost -v"
CRON_LOG_LEVEL: 8None, I hope at least ;). I had to adjust the timestamp provided, it seems to fit with my locale (France) but it may need some additional work.
This program is licenced with GNU GENERAL PUBLIC LICENSE version 3 by Free Software Foundation, Inc.