mqtt-sensord/mqtt_sensord/mqtt_sensord.py

#!/usr/bin/env python3
import sys
import time

if sys.implementation.name != 'micropython':
    import argparse
    from . import sensorlib
    from .mqttlib import MQTTClient
else:
    import sensorlib
    from mqttlib import MQTTClient


def main():
    if sys.implementation.name != 'micropython':
        parser = argparse.ArgumentParser()
        parser.add_argument("-c", "--config", default="/etc/mqtt-sensord.conf")
        parser.add_argument("-d", "--debug", action="store_true", default=False)
        args = parser.parse_args()
        config_path = args.config
        debug = args.debug
    else:
        # most probably on micropython
        config_path = "mqtt-sensord.conf"
        debug = False

    config = sensorlib.load_config(config_path)
    debug = debug or config.get('debug')
    config['debug'] = debug

    sensorlib.Sensor.configure(config['host']['name'], sys.platform)

    mcfg = config['mqtt']
    if 'client_id' in config['mqtt']:
        client_id = config['mqtt']['client_id']
    else:
        client_id = None

    mqtt = MQTTClient(mcfg['host'], mcfg['user'], mcfg['password'], client_id)
    default_mqtt_topic = mcfg.get('sensor_topic')
    print("Connected to", mqtt.host, "with default topic", default_mqtt_topic)
    mqtt.set_callback(sensorlib.Sensor.run_mqtt_callback)

    sensors = []
    extra_topics = set()
    for scfg in config['sensors']:
        s = sensorlib.Sensor.make_sensor(**scfg)
        s.register_callbacks()
        for topic in s.get_topics():
            extra_topics.add(topic)
        sensors.append(s)

    for topic in extra_topics:
        print("Subscribe to", topic)
        mqtt.subscribe(topic)

    last_measurement = time.time()
    while True:
        # handle regular sensor data
        if debug:
            print("Getting values from sensors...")
        for sensor in sensors:
            if sensor.HAS_SENSOR_DATA:
                data = sensor.gen_datapoint()
                if debug:
                    print(default_mqtt_topic, data)
                mqtt.send_data(default_mqtt_topic, data)
            if not mqtt.is_async():
                mqtt.process_mqtt()

        if mqtt.is_async():
            time.sleep(max(0.0, time.time() + config['host']['interval'] - last_measurement))
        else:
            while time.time() - last_measurement < config['host']['interval']:
                mqtt.process_mqtt()
                time.sleep(0.1)
        last_measurement = time.time()


if __name__ == '__main__':
    main()