public static MqttMsgPingReq Parse(byte fixedHeaderFirstByte, byte protocolVersion, IMqttNetworkChannel channel)
{
MqttMsgPingReq mqttMsgPingReq = new MqttMsgPingReq();
if (protocolVersion == (byte)4 && ((uint)fixedHeaderFirstByte & 15U) > 0U)
{
throw new MqttClientException(MqttClientErrorCode.InvalidFlagBits);
}
MqttMsgBase.decodeRemainingLength(channel);
return(mqttMsgPingReq);
}
/// <summary>
/// Parse bytes for a PINGREQ message
/// </summary>
/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
/// <param name="protocolVersion">Protocol Version</param>
/// <param name="channel">Channel connected to the broker</param>
/// <returns>PINGREQ message instance</returns>
public static MqttMsgPingReq Parse(byte fixedHeaderFirstByte, byte protocolVersion, IMqttNetworkChannel channel)
{
MqttMsgPingReq msg = new MqttMsgPingReq();
if (protocolVersion == MqttMsgConnect.PROTOCOL_VERSION_V3_1_1)
{
// [v3.1.1] check flag bits
if ((fixedHeaderFirstByte & MSG_FLAG_BITS_MASK) != MQTT_MSG_PINGREQ_FLAG_BITS)
throw new MqttClientException(MqttClientErrorCode.InvalidFlagBits);
}
// already know remaininglength is zero (MQTT specification),
// so it isn't necessary to read other data from socket
int remainingLength = MqttMsgBase.decodeRemainingLength(channel);
return msg;
}
/// <summary>
/// Parse bytes for a PINGREQ message
/// </summary>
/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
/// <param name="protocolVersion">Protocol Version</param>
/// <param name="channel">Channel connected to the broker</param>
/// <returns>PINGREQ message instance</returns>
public static MqttMsgPingReq Parse(byte fixedHeaderFirstByte, byte protocolVersion, IMqttNetworkChannel channel)
{
MqttMsgPingReq msg = new MqttMsgPingReq();
if (protocolVersion == MqttMsgConnect.PROTOCOL_VERSION_V3_1_1)
{
// [v3.1.1] check flag bits
if ((fixedHeaderFirstByte & MSG_FLAG_BITS_MASK) != MQTT_MSG_PINGREQ_FLAG_BITS)
{
throw new MqttClientException(MqttClientErrorCode.InvalidFlagBits);
}
}
// already know remaininglength is zero (MQTT specification),
// so it isn't necessary to read other data from socket
int remainingLength = MqttMsgBase.decodeRemainingLength(channel);
return(msg);
}
/// <summary>
/// Execute ping to broker for keep alive
/// </summary>
/// <returns>PINGRESP message from broker</returns>
private MqttMsgPingResp Ping()
{
MqttMsgPingReq pingreq = new MqttMsgPingReq();
try
{
// broker must send PINGRESP within timeout equal to keep alive period
return (MqttMsgPingResp)this.SendReceive(pingreq.GetBytes(), this.keepAlivePeriod);
}
catch (MqttTimeoutException)
{
// client must close connection
this.Close();
return null;
}
}
/// <summary>
/// Execute ping to broker for keep alive
/// </summary>
/// <returns>PINGRESP message from broker</returns>
private MqttMsgPingResp Ping()
{
MqttMsgPingReq pingreq = new MqttMsgPingReq();
try
{
// broker must send PINGRESP within timeout equal to keep alive period
return (MqttMsgPingResp)this.SendReceive(pingreq, this.keepAlivePeriod);
}
catch (Exception e)
{
MqttUtility.Trace.WriteLine(TraceLevel.Error, "Exception occurred: {0}", e.ToString());
this.isKeepAliveTimeout = true;
// client must close connection
this.Close();
return null;
}
}
