IrDA Questions

[Mike Bartels]

Hi all,

I have been battling to establish an IrDA connection between my Compaq i3850
and my Polar sport watch S720i (heart rate monitor).

I get some weird results, that I don't understand:
Here's my code:

--------------------
// Connect to S720i, send overview request and get results.
IrDAClient client = null;
Stream streamReader, streamWriter = null;
byte[] S720I_OVERVIEW_REQUEST = {0x34, 0xa6, 0x55,0x55,0x56,0xb8,0x25};

client = new IrDAClient();
client.Connect("HRM"); // S720i service = "HRM"

streamWriter = client.GetStream();

streamWriter.Write(S720I_OVERVIEW_REQUEST,0,7); // First question comes
up here!
streamWriter.Close();

byte[] buffer = new byte[1024];

streamReader.Read(buffer,0,buffer.Length-1); // Second question comes up
here!
streamReader.Close();

//... some exception handling follows.
----------------------

So here are my questions:
1. If I use streamWriter.Write I don't seem to get all response bytes (only
the first two). If I use
foreach(byte B in S720I_OVERVIEW_REQUEST)
{ streamWriter.WriteByte(B); }
I get all the values I need. Why is there a difference, doesn't
streamWriter.Write use a byte[] array?

2. Regardless of whether I read in the response with .Read or .ReadByte, the
response byte array
has a 0x02 byte as every other byte. The watch does not return this,
however. Example:
The result should be: {0x34, 0xa6, 0x55,0x55,0x56,0xb8,0x25}, however,
the .Read method gets me
{0x34, 0x02, 0xa6, 0x02, 0x55, 0x02, 0x55,0x02, 0x56,0x02, 0xb8, 0x02,
0x25}.

3. Could all of this have to do with the connection speed of the iPAQ's IR
port? The watch can do:
9600 bps, 8 data bits, 1 or 2 stop bits (??), no parity
Is there a way to set this programmatically?

Any help would be appreciated, otherwise my scalp will be completely void of
hair since I will have torn out
large lumps of it ;)

Regards,
Michael