client option [resubscribe:false] doesn't stop the client from resubscribing to broker

[bo-er]

• on mqtt broker end I closed the connection of the client
• on mqtt.js client I set resubscribe: false to prevent resubscribe:

var client = mqtt.connect('mqtt://localhost:18888', {
    clientId: "coco",
    username: user.username,
    password: user.password,
    protocolVersion: 5,
    resubscribe: false,
    reconnectPeriod: 3000,
    properties: {
        requestProblemInformation: true
    }
})

• I hope after the connection is closed the client may not try to resubscribe,but that is not the case.

  client.subscribe(topic, function (err, granted) {
        if (err) {
            console.log('subscribe error:', err)
        }
    })

• And these messages were shown on the console,indicating that the mqtt.js client is resubscribing forever

subscribe error: Error: Connection closed
    at /Users/steve/node_modules/mqtt/lib/client.js:124:29
    at Array.forEach (<anonymous>)
    at flushVolatile (/Users/steve/node_modules/mqtt/lib/client.js:122:24)
    at Socket.<anonymous> (/Users/steve/node_modules/mqtt/lib/client.js:358:5)
    at Socket.emit (events.js:223:5)
    at TCP.<anonymous> (net.js:664:12)

subscribe error: Error: Connection closed
    at /Users/steve/node_modules/mqtt/lib/client.js:124:29
    at Array.forEach (<anonymous>)
    at flushVolatile (/Users/steve/node_modules/mqtt/lib/client.js:122:24)
    at Socket.<anonymous> (/Users/steve/node_modules/mqtt/lib/client.js:358:5)
    at Socket.emit (events.js:223:5)
    at TCP.<anonymous> (net.js:664:12)
subscribe error: Error: Connection closed
    at /Users/steve/node_modules/mqtt/lib/client.js:124:29
    at Array.forEach (<anonymous>)
    at flushVolatile (/Users/steve/node_modules/mqtt/lib/client.js:122:24)
    at Socket.<anonymous> (/Users/steve/node_modules/mqtt/lib/client.js:358:5)
    at Socket.emit (events.js:223:5)
    at TCP.<anonymous> (net.js:664:12)

Am I wrong? 🙋🏻

AB#9191975

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