93 Zeilen
3.1 KiB
Python
93 Zeilen
3.1 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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"""
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mqtt (MQTT)
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===========
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**Author:**
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* Dirk Alders <sudo-dirk@mount-mockery.de>
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**Description:**
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This Module supports functionality for mqtt connections
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**Submodules:**
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* :mod:`mqtt_client`
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**Unittest:**
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See also the :download:`unittest <mqtt/_testresults_/unittest.pdf>` documentation.
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**Module Documentation:**
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"""
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__DEPENDENCIES__ = []
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import logging
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import paho.mqtt.client as paho
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import socket
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import time
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try:
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from config import APP_NAME as ROOT_LOGGER_NAME
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except ImportError:
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ROOT_LOGGER_NAME = 'root'
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logger = logging.getLogger(ROOT_LOGGER_NAME).getChild(__name__)
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class mqtt_client(object):
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def __init__(self, name, host, port=1883, username=None, password=None):
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self.__block_add_callbacks__ = True
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logger.info("Initiating mqtt client instance")
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self.__callbacks__ = {}
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self.__client__ = paho.Client(name) # create client object
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if username is not None and password is not None:
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logger.debug("Configuring authentification")
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self.__client__.username_pw_set(username, password) # login with credentials
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self.__client__.on_message = self.__receive__ # attach function to callback
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self.__client__.on_connect = self.__on_connect__
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self.__client__.on_disconnect = self.__on_disconnect__
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try:
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self.__client__.connect(host, port) # establish connection
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except (socket.timeout, OSError) as e:
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logger.warning("Can not connect to MQTT-Server")
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self.__client__.loop_start() # start the loop
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def add_callback(self, topic, callback):
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while self.__block_add_callbacks__:
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time.sleep(.1)
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logger.debug("Adding callback for topic %s", topic)
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self.__callbacks__[topic] = callback
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self.__client__.subscribe(topic)
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def send(self, topic, payload):
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logger.debug("Sending message with topic %s and payload %s",
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topic, str(payload))
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self.__client__.publish(topic, payload)
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def __on_connect__(self, client, userdata, flags, rc):
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logger.debug("Connect with rc=%d", rc)
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if rc == 0:
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self.__block_add_callbacks__ = True
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logger.debug("Registering topics...")
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for topic in self.__callbacks__:
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self.__client__.subscribe(topic)
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self.__block_add_callbacks__ = False
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def __on_disconnect__(self, client, flags, rc):
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logger.warning("Disconnect with rc=%d", rc)
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def __receive__(self, client, userdata, message):
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logger.debug("Received message with topic %s and payload %s", message.topic, str(message.payload))
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for topic in self.__callbacks__:
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if topic.endswith('#'):
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if message.topic.startswith(topic[:-1]):
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self.__callbacks__[topic](client, userdata, message)
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else:
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if topic == message.topic:
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self.__callbacks__[topic](client, userdata, message)
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