I have defined my callback function in another python module. How do I attach that callback which is defined in another module to paho.mqtt client callback? For. e.g I have a database.py where I perform all the database operations such as connecting to database and storing the messages in database and mqttbroker.py module where I create a mqtt.client() instance and connect to the broker and subscribe to the topics and define some callbacks like on_connect and on_disconnect. Now for on_message mqtt callback, I have created the callback function in my database.py module. How do I attach this callback? I have main.py(my client) which imports the database.py and mqttbroker.py module.
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That breaks the separation you were looking for. Move the callback into the `mqttbroker.py` and make calls to the `database.py`. – hardillb Nov 29 '17 at 21:18
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Also edit the question to actually show the code – hardillb Nov 29 '17 at 21:19
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okay thank you. Please find the code below. It works now. – user2301 Dec 18 '17 at 14:14
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define interface and call that interface in client module and attach callback defined in database module to this called interface.
#mqttbroker.py
def onMessage(self, callback):
self.client.on_message = callback
self.client.loop_forever()
#database.py
def on_message(self,client,userdata, msg)
#store messsages in db
#main.py
import mqqtbroker
import database
client = mqqtbroker()
client.connect(host, port, 60)
client.onMessage(database.on_message)
user2301
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This code is only for prototyping some infrastructure testing purpose to see possibilities on how we can separate the database, client and message broker modules. – user2301 Dec 18 '17 at 14:25