When the network is disconnected abnormally, the disconnection event is not triggered in time

[honyudeng]

The "offline" event will be triggered in a few seconds client.on('offline', (error) => { console.log('offline:', error) }) offline This event triggered too slowly What event can I call back in time to disconnect?

[lhthang96]

I believe what you need is that keepalive value when you initialize the client.

MQTT client detects the disconnection via a packet called pingreq, it will send a pingreq packet for every keepalive duration, if it does not receive the ack message from the broker, it will consider the connection is lost. The default value of keepAlive is 60 seconds based on the documentation, it means you can only detect the disconnection after a minute or so.

If you would like to detect the disconnection sooner, just reduce the keepalive value.

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