Re: [Bluez-devel] read data from one device to another over rfcomm

Hi Naved,

I am developing some applications using BlueZ.  The
developer board is Axis Developer 82+.  

The following is the code for one of the functions. 
Basically, there are two axis boards, one is acting as
a server, the other, a client.  Upon establising a
connection with the server, the client receives a menu
that shows the actions it can take: run a command on
the other server, receive a file from the server, send
a file to the server.

This is the code for the client after connecting to
the server:

	while (1)
	  {	    
	    memset (optn_buff, 0, 3 );
	    
            printf ("What do you want to do (type in
the option number)?  Press CTRL-C for hang-up\n");
            printf ("\t(1) Run a command\n");
	    printf ("\t(2) Transfer a file from here to
there\n");
	    printf ("\t(3) Transfer a file from there to
here\n");
	    
	    gets(optn);                                // get
option
	    
	    optn_int = atoi(optn);
	    
	    if (optn_int < 1 || optn_int > 3)
	      {
	        printf ("Choose the option that's
given\n\n");
		continue;
	      }
	      
	    optn_str = sprintf(optn_buff, "%d", optn_int);   
      // convert optn to string 
	    chk_write = write (sk, optn_buff, optn_str);     
  // send optn to server
	    
	    switch (optn_int)
	      {
	        case 1:
		  rcmdc (sk);                                   //
run command on server
		  break;
		case 2:
		  snd (sk);                                     //
send file from here
		  break;
		case 3:
		  rec (sk);                                     //
receive file from there
		  break;    
	      }
	  }  

optn_buff is an array of unsigned char type, of size
3.  It sends the choice made by the client to the
server.

The following is the code from the server:

	while (1)
	  {	    
	    memset (optn_buff, 0, 3 );
	    
	    chk_read = read (sk, optn_buff, 1);	             
 // read option chosen by the client
	    optn = atoi(optn_buff);                          
 // convert buffer data to int    
	    
	    switch (optn)
	      {
	        case 1:
		  rcmds (sk);                                   //
run command on server
		  break;
		case 2:
		  rec (sk);                                     //
receive file 
		  break;
		case 3:
		  snd (sk);                                     //
send file 
		  break;    
	      }
	   }  	

After connection is made, the server waits to receive 
the instruction to be executed as requested by the
client.  

The problem I am facing is with the read statements:  
 The devices do not read what's being sent to them. 
The queer thing is, if I use the same code to connect
and play with a phone, the read statements execute.  I
have been able to send and receive data (using read
and write as above) with a number of phones.  So, the
boards can't read when they are being written to, but
the phones can read when they're being written to.

you must have a bug somewhere, because the RFCOMM is a real duplex
stream and it is working perfect. Do you use the latest kernel? Do you
checked with "hcidump -X -V" what happens on each side?

Regards

Marcel




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