case about mqtt in ncs v2.1.2 keepalive state

[peter.min]

Hi,

sdk ncs v2.1.2

example :mqtt_sample

1. The mqtt client connects to the server

2. The mqtt server is faulty

3. The mqtt client cannot detect the server fault for a long time

4. How can mqtt clients quickly detect server faults?

Thank you for all your assistance.
Kind regards,
Peter.Min

[Didrik Rokhaug]

Hi,

What do you mean with "The mqtt server is faulty". How is it faulty?

What is the keepalive duration set to?

How long does it take currently for the device to detect that the MQTT server is faulty?

Does the application send anything to the broker? If so, what QoS is used?

Does the device use any power saving features?

Best regards,

Didrik

[peter.min]

Hi Didrik Rokhaug,

A fault refers to shutting down or disconnecting the server

The test uses the default MQTT example

1. Through my test, I found that it is related to the server.

2. Which server configurations affect line disconnection detection?

Thank you for all your assistance.
Kind regards,
Peter.Min

[Didrik Rokhaug]

What is the keepalive duration set to?

How long does it take currently for the device to detect that the MQTT server is faulty? Is it tied to any event (such as sending the next data message)?

Does the application send anything to the broker? If so, what QoS is used? How often does the application send something?

Does the device use any power saving features?