MqttClientSubscribeMessageAsync 方法 (String)

public Task<OperateResult> SubscribeMessageAsync(
	string topic
)

Public Function SubscribeMessageAsync ( 
	topic As String
) As Task(Of OperateResult)

public:
Task<OperateResult^>^ SubscribeMessageAsync(
	String^ topic
)

member SubscribeMessageAsync : 
        topic : string -> Task<OperateResult> 

// 简单的实例化例子
MqttClient mqttClient = new MqttClient( new MqttConnectionOptions( )
{
    ClientId = "ABC",                     // 客户端的唯一的ID信息
    IpAddress = "127.0.0.1",              // 服务器的地址
} );

// 订阅示例
mqttClient.OnMqttMessageReceived += ( MqttClient client, MqttApplicationMessage message ) =>
{
    Console.WriteLine( "Time:" + DateTime.Now.ToString( ) );
    Console.WriteLine( "Topic:" + message.Topic );
    Console.WriteLine( "Payload:" + Encoding.UTF8.GetString( message.Payload ) );
};

// 然后添加订阅
HslCommunication.OperateResult sub = mqttClient.SubscribeMessage( "A" );
if (sub.IsSuccess)
{
    // 订阅成功
}
else
{
    // 订阅失败
}