/// <summary>
/// Send PDU to server
/// </summary>
/// <param name="pdu">HARTFrame</param>
/// <returns>HARTFrame</returns>
private HARTFrame PDU(HARTFrame pdu)
{
var frame = new HARTIPFrame(SequenceNumber, messageID: MessageID.PDU, payload: pdu.Serialize());
stream.Write(frame.Serialize());
var buffer = new Byte[256];
stream.Read(buffer, 0, buffer.Length);
var response = new HARTFrame(new HARTIPFrame(buffer).GetPayload());
SequenceNumber++;
return(response);
}
/// <summary>
/// send keep-alive
/// </summary>
/// <returns>bool</returns>
private bool KeepAlive()
{
var frame = new HARTIPFrame(SequenceNumber).Serialize();
stream.Write(frame);
var buffer = new Byte[256];
stream.Read(buffer, 0, buffer.Length);
var response = new HARTIPFrame(buffer).Serialize();
frame[1] = 0x01;
SequenceNumber++;
if (frame.SequenceEqual(response))
{
return(true); //return true if answered
}
else
{
return(false);
}
}
/// <summary>
/// send initiate with timeout in ms
/// </summary>
/// <param name="timeout">int</param>
/// <returns></returns>
private bool Initiate(int timeout)
{
byte[] initiateTimeout = new byte[] { 0x01 };
initiateTimeout = initiateTimeout.Concat(BitConverter.GetBytes(timeout).Reverse()).ToArray();
var frame = new HARTIPFrame(SequenceNumber, messageID: MessageID.Initiate, payload: initiateTimeout);
stream.Write(frame.Serialize());
SequenceNumber++;
var buffer = new Byte[13];
stream.Read(buffer, 0, buffer.Length);
var response = new HARTIPFrame(buffer);
if (frame.GetPayload().SequenceEqual(response.GetPayload()))
{
return(true); // return true if intiate is reciprocated
}
else
{
return(false);
}
}