/// <summary>
/// mqtt客户端
/// </summary>
/// <param name="serverUri">mqtt://mymqtt.com</param>
/// <param name="clientId">客户端id</param>
/// <param name="persistence">持久化方式</param>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="UriFormatException"></exception>
/// <exception cref="NotSupportedException"></exception>
/// <exception cref="MqttException"></exception>
public MqttClient(string serverUri, string clientId, MqttPersistence persistence)
: base(IntPtr.Zero, true)
{
if (string.IsNullOrEmpty(serverUri))
{
throw new ArgumentNullException("serverUri");
}
if (string.IsNullOrEmpty(clientId))
{
throw new ArgumentNullException("clientId");
}
if (persistence == MqttPersistence.User)
{
var message = string.Format("不支持的持久化方式：{0}.{1}", typeof(MqttPersistence).Name, persistence);
throw new NotSupportedException(message);
}
var uri = new Uri(serverUri);
const int mqttDefaultPort = 1883;
var tcpUri = string.Format("tcp://{0}:{1}", uri.Host, uri.Port > 0 ? uri.Port : mqttDefaultPort);
var er = MQTTAsync.MQTTAsync_create(ref this.handle, tcpUri, clientId, persistence, IntPtr.Zero);
this.EnsureSuccessCode(er);
this.InitClientCallbacks();
}
public static extern MqttError MQTTAsync_create(
ref IntPtr handle,
[MarshalAs(UnmanagedType.LPStr)] string serverURI,
[MarshalAs(UnmanagedType.LPStr)] string clientId,
MqttPersistence persistence_type,
IntPtr persistence_context);
