/// <summary>
/// Unsubscribe for message topics
/// </summary>
/// <param name="topics">List of topics to unsubscribe</param>
/// <returns>Message Id in UNSUBACK message from broker</returns>
public ushort Unsubscribe(string[] topics)
{
int attempts = 0;
bool acknowledged = false;
MqttMsgUnsubscribe unsubscribe =
new MqttMsgUnsubscribe(topics);
MqttMsgUnsuback unsuback = null;
do
{
try
{
// try unsubscribe
unsuback = (MqttMsgUnsuback)this.SendReceive(unsubscribe.GetBytes());
acknowledged = true;
}
catch (MqttTimeoutException)
{
// no UNSUBACK message received in time, retry with duplicate flag
attempts++;
unsubscribe.DupFlag = true;
// delay before retry
if (attempts < MQTT_ATTEMPTS_RETRY)
{
Thread.Sleep(MQTT_DELAY_RETRY);
}
}
} while ((attempts < MQTT_ATTEMPTS_RETRY) && !acknowledged);
// return message id from SUBACK or zero (no message id)
return(acknowledged ? unsuback.MessageId : (ushort)0);
}
public void UnbscribeBasicEncodeTestv5()
{
// Arrange
byte[] encodedCorrect = new byte[] { 162, 19, 0, 42, 0, 0, 6, 116, 112, 111, 105, 99, 49, 0, 6, 116, 111, 112, 105, 99, 50 };
MqttMsgUnsubscribe unsubscribe = new MqttMsgUnsubscribe(new string[] { "tpoic1", "topic2" });
unsubscribe.MessageId = 42;
// Act
byte[] encoded = unsubscribe.GetBytes(MqttProtocolVersion.Version_5);
// Assert
Assert.Equal(encodedCorrect, encoded);
}
public void UnbscribeAdvanceEncodeTestv5()
{
// Arrange
byte[] encodedCorrect = new byte[] { 162, 54, 0, 42, 35, 38, 0, 4, 80, 114, 111, 112, 0, 26, 111, 110, 108, 121, 32, 111, 110, 101, 32, 116, 104,
105, 115, 32, 116, 105, 109, 101, 32, 102, 111, 114, 32, 102, 117, 110, 0, 6, 116, 112, 111, 105, 99, 49,
0, 6, 116, 111, 112, 105, 99, 50 };
MqttMsgUnsubscribe unsubscribe = new MqttMsgUnsubscribe(new string[] { "tpoic1", "topic2" });
unsubscribe.MessageId = 42;
unsubscribe.UserProperties.Add(new UserProperty("Prop", "only one this time for fun"));
// Act
byte[] encoded = unsubscribe.GetBytes(MqttProtocolVersion.Version_5);
Helpers.DumpBuffer(encoded);
// Assert
Assert.Equal(encodedCorrect, encoded);
}
