MQTT断线后重连，订阅消息无法恢复

[happychenleilei]

问题描述： MQTT断线再次重连后，之前订阅过的主题，无法收到消息 期望：MQTT断线后重连，之前订阅的消息能够正常收到消息 代码如下，

func NewMQTTServer(
    c *conf.Bootstrap, svc *service.OperationStatService,
) *mqtt.Server {
    ctx := context.Background()
    var opts = []mqtt.ServerOption{
        mqtt.WithAddress([]string{c.Server.Mqtt.Addr}),
        mqtt.WithCodec("json"),
        mqtt.WithAuth(c.Server.Mqtt.Username, c.Server.Mqtt.Password),
        mqtt.WithClientId(c.Server.Mqtt.ClientId),
        mqtt.WithCleanSession(true),
    }
    srv := mqtt.NewServer(opts...)
    _ = srv.RegisterSubscriber(
        ctx,
        c.OperationStat.SubTopic,
        biz.RegisterDeviceAckJsonHandler(svc.DeviceAckHandler),
        biz.DeviceAckCreator,
    )
    svc.SetMqttBroker(srv)
    return srv
}