Hi Islam,
Try to do it as I do... In my case it is working, but anyway, you have not
implemented properly de protocol
(the code is in pseudo-C#)
//First we have to send the protocol initialization, sending the protocol
version
us[0]='T'; us= '!';
socket.Send(us,0,us.Length, ....);
//After that we have to receive also de protocol information
byte[] check = new byte[2];
socket.Receive(check,0, check.Lengh, ...)
//Now, receive the platform information (4 bytes)
byte[] nonceRem = new byte[4];
socket.Receive(nonceRem,0, nonceRem.Length,...)
//And send the information of the platform we are using,
//in my case the platform is micaz and the corresponding value is 3
char[] nonce = new char[4];
int platform = 3; //micaz
nonce[0] = (char)platform;
nonce[1] = (char) (platform >> 8);
nonce[2] = (char) (platform >> 16);
nonce[3] = (char) (platform >> 24);
socket.send(nonce, 0, nonce.Length,...)
//And thats all falks ;)
// Following you will receive one byte that show you the length of the next
message
//And following you have to read from socket tha amount of bytes
byte[] myLength = new byte[1];
socket.receive(myLength,0, 1,..)
byte[] data = new byte[myLength];
socket.receive(data,0, data.Length,...)
Anyway, if it doesn't work, check that you have compiled the last version
for C-based SerialForwarder (you can download it from tinyos cvs).
Greetings
----- Original Message -----
From: "Islam Hegazy" <[EMAIL PROTECTED]>
To: "Javier Barbarán" <[EMAIL PROTECTED]>
Cc: <[email protected]>
Sent: Tuesday, June 05, 2007 7:49 AM
Subject: Re: connecting to the SerialForwarder
Thanks very much for the paper. It was really helpful.
Now I can receive from the SF. However, what I receive is unexpected.
First,
what is the platform that I have to send to the SF? At the moment I resend
the platform that I receive from the SF. Second, the data length byte is
always '\t' which leads to wrong readings. Following is my code:
char s[2];
char dataLen[1];
char packet[256];
char platform[4];
int rcd;
short data;
short len;
if ((rcd = recv(sd, s, 2, 0)) != 0)
{
send(sd, s, 2, 0);
rcd = recv(sd, platform, 4, 0); //reads 4 bytes
send(sd, platform, 4, 0); //send the platform that I received
rcd = recv(sd, dataLen, 1, 0); //dataLen is always '\t'
sscanf(dataLen, "%d", &len); //wrong len
printf("%d\n", len);
rcd = recv(sd, packet, len, 0); //read wrong data
sscanf(packet, "%d", &data); //read the first byte
printf("%d\n", data);
}
I also found this article about the SF protocol:
http://www.stanza.co.uk/emergentcity/?cat=11
Regards
Islam Hegazy
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