scd4x


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#!/usr/bin/python3
import sys
import json

import paho.mqtt.client as mqtt

def main():
    if len(sys.argv) < 3:
        print(len(sys.argv))
        print(f'usage: {sys.argv[0]} json-file mqtt-host')
        return 1

    filename = sys.argv[1]
    mqtthost = sys.argv[2]

    client = mqtt.Client()
    client.connect(mqtthost, 1883)

    pvalues = {}
    while True:
        with open(filename, 'r', encoding = 'utf-8') as f:
            values = json.loads(f.read())

        for key in ('co2', 'temperature', 'humidity'):
            curr = values.get(key)
            prev = pvalues.get(key)
            if prev and prev == curr:
                continue

            topic = f'sensors/{key}/scd4x/{values.get("serial")}'
            #print(f'{topic} = {curr}')
            client.publish(topic, curr)

        pvalues = values

if __name__ == '__main__':
    sys.exit(main())