battleger.blogg.se - Teamviewer login takes forever

This creates multiple callbacks to process messages from different topics. The better way to do this is to use the message_callback_add(sub, callback) function of the client object. Then you can create if conditions to process the messages accordingly. One way to do this is by using the message.topic attribute to check which topic is the message published to. If you have multiple messages being received from different topics and need to process each topic’s message in a different way then we have to sort the messages.

If you are printing the message in the on_message() function.

If you have entered the topic names correctly in the subscribe() and publish() functions in sub.py and pub.py respectively.

If you have subscribed to the topic in the on_connect() callback in sub.py.

You have added the function on_message() to the client object’s attribute.

If the message doesn’t get printed, check if: The output will show the message and the topic. If you notice each attribute of the message object is also a parameter we use in the client’s publish() function.įirst run sub.py and then run pub.py. The message object has 4 attributes: topic, payload, qos, retain. I already explained the first two in the on_connect() section. The on_message() callback has 3 parameters: client, userdata & message.