Not reciving messages after a while

Hello, I’m experiencing some issue with this library

I have a node.js app running on a Raspberry Pi. The connection is done successfully and I can send / receive messages, but after a while (sometimes 20 minutes, sometimes 4 hours), I stop receiving messages.

I’m running this application in several machines and not all of them experience the same issue. Also, when I stop receiving messages, after a restart, the app communicates successfully again (which indicates that it’s not a network related issue)

Can you point me on how can I debug this? Thanks in advance

"aws-iot-device-sdk": "2.2.0" node --version: 8.10.0

[matiasdecarli]

Ok finally found the issue & solution for this

The issue that I was having was: the messages not been posted on AWS IoT due to a faulty network. Since the messages didn’t have a timeout set, I was realizing after a long time that the messages were failing. To solve this, I just set keepalive: 10. After 10 seconds if the messages didn’t have the PUBACK, an error is trigged, and the reconnection is attempted

(I’m also using qos: 1)

After doing this, the library works as a charm. Thanks for the help @fengsongAWS

[matiasdecarli]

I am already using the qos:1, yes.

Regarding the lost connection, I can see locally that after the app starts & connect, if I turn off the wifi, the iot doesn’t realize that the messages are not being sent. Is there any way to detect this sooner? After I turn off the connection, all the publish messages stop reaching the callback

device.publish('<Topic>', JSON.stringify(payload), {
      qos: 1
    }, function (err, resp) {
      // never reach this part
    })