when mqtt server goes offline (host shut off), and comes back online....

[geetee24]

when mqtt server goes offline (host shut off), and comes back online.... this library's reconnect handler does not recover and does not reconnect.

Need example showing how to accomplish this

[doc-han]

Can you provide a sample of your connection code? Note: when reconnectPeriod is set to 0 reconnection is disabled. reference

[geetee24]

The code is exactly the same as the example that you provide

On Mon, Apr 4, 2022 at 4:37 AM Farhan Yahaya @.***> wrote:

Can you provide a sample of your connection code? Note: when reconnectPeriod is set to 0 reconnection is disabled. reference https://github.com/mqttjs/MQTT.js#client

— Reply to this email directly, view it on GitHub https://github.com/mqttjs/MQTT.js/issues/1466#issuecomment-1087447653, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABS6UTZC32KC3Q22J7TBYELVDLH73ANCNFSM5SD7DMXA . You are receiving this because you authored the thread.Message ID: @.***>

[danbo]

I think I have the same problem - if server goes away and client keeps trying to publish,

1. client says error / connection refused
2. error handler fires - client "ends"
3. client disconnecting error (below) upon publish more events - no recovery when server is back online

Error: client disconnecting
    at MqttClient._checkDisconnecting (c:\...\node_modules\mqtt\lib\client.js:577:26)
    at MqttClient.publish (c:\...\node_modules\mqtt\lib\client.js:617:12)
    ...

All examples show using client.end() in the error handler.

mqttClient.on('error', function (err) {
    console.log(err);
    client.end();
  });

When I remove client.end(), the client library reconnects successfully when the server back and continues to send messages as expected. Other clients listening successfully reconnect on their own and receive messages.

I think it's related to this open issue: #1284

Also, can someone clarify why/when we would want to call end() ?

This is against the eclipse mqtt broker.

[robertsLando]

MQTT 5.0.0 BETA is now available! Try it out and give us feedback: npm i mqtt@beta. It may fix your issues