We put everything you need to know about MQTT and MQTT 5, the basic concepts, features and facts, into one comprehensive E-Book. You may download it here bit.ly/3XsgQK5
Hello! I have a question. Can an MQTT broker publish and subscribe to the same topic? What about a client? I ask this because I'm using EveryNet and MQTT trying to publish and subscribe to the same topic, but it shows a weird error. "Publish and subscribe topics can not be the same" I don't know if this is a particularity of EveryNet or if it is just not possible.
Hi Kay, yes, the UNSUBSCRIBE message deletes existing subscriptions of a client on the broker. The UNSUBSCRIBE message is similar to the SUBSCRIBE message and has a packet identifier and a list of topics. The list of topics can contain multiple topics from which the client wants to unsubscribe. It is only necessary to send the topic (without QoS).
Hello Sir, I love your Essentials! It's very easy to understand. I'm newbie. There is a little thing that I'm not really understand. Can I have a question please: What is packetID? What is it's purpose? And how to use it? Sorry about my bad English. Thank you so much!
Hey! Thank you for your feedback! You can find the answer in this article www.hivemq.com/blog/mqtt-essentials-part-4-mqtt-publish-subscribe-unsubscribe/
@@DominikObermaier Hi Sir, I have another doubt, how the time stamping works here in this protocol. Other protocols are having timestamping as special functionality.
We put everything you need to know about MQTT and MQTT 5, the basic concepts, features and facts, into one comprehensive E-Book. You may download it here bit.ly/3XsgQK5
Thank you for doing this. These are excellent videos.
Great video series ... thank you for doing this ...
Glad you enjoy it!
Awesome
Hello! I have a question. Can an MQTT broker publish and subscribe to the same topic? What about a client?
I ask this because I'm using EveryNet and MQTT trying to publish and subscribe to the same topic, but it shows a weird error.
"Publish and subscribe topics can not be the same"
I don't know if this is a particularity of EveryNet or if it is just not possible.
Thank you:)
Glad you liked it :)
So you can send "unsubscribed" packet to broker to unsubscribe one or more data stream topics.
Hi Kay, yes, the UNSUBSCRIBE message deletes existing subscriptions of a client on the broker. The UNSUBSCRIBE message is similar to the SUBSCRIBE message and has a packet identifier and a list of topics. The list of topics can contain multiple topics from which the client wants to unsubscribe. It is only necessary to send the topic (without QoS).
Hello Sir,
I love your Essentials! It's very easy to understand.
I'm newbie. There is a little thing that I'm not really understand.
Can I have a question please: What is packetID? What is it's purpose? And how to use it?
Sorry about my bad English.
Thank you so much!
Hey! Thank you for your feedback! You can find the answer in this article www.hivemq.com/blog/mqtt-essentials-part-4-mqtt-publish-subscribe-unsubscribe/
@@HiveMQ Thank you so much!
Is there any time interval fixed for subscriber to get the data .. I mean periodic type ... or instantaneously
MQTT uses a push-based principle, so data is is pushed by the broker to subscribers instantly as soon as there's data available for a subscriber.
@@DominikObermaier I loved your videos... You can see my channel too... I am a SCADA expert and started to work on IoTs. Love from India
@@DominikObermaier Hi Sir, I have another doubt, how the time stamping works here in this protocol. Other protocols are having timestamping as special functionality.
@@DominikObermaier What do you mean by "push-based principle"? Could you please explain that in more detial for me?