[Tinyos-help] Re: connecting to the SerialForwarder

[Javier Barbarán]

Hello,

I mean that you have to take a look to the class that I mentioned in my 
last mail. There you will see that in order to connect to 
SerialForwarder application (I remember that you were using c-based 
version) you have to follow a specific protocol (implemented in 
SFProtocol java class) where you receive 'T!' that is the begining of 
the protocol. So if you look to the server side in SerialForwarder you 
will be able to see how to implement the protocol.

The following code is part of sfsource.c file, part of c-based 
serialforwarder that you are already using.


int init_sf_source(int fd)
   95 /* Effects: Checks that fd is following the serial forwarder protocol
   96      Sends 'platform' for protocol version '!', and sets 'platform' to
   97      the received platform value.
   98    Modifies: platform
   99    Returns: 0 if it is, -1 otherwise
  100  */
  101 {
  102   char check[2], us[2];
  103   int version;
  104   unsigned char nonce[4];
  105   /* Indicate version and check if serial forwarder on the other end */
  106   us[0] = 'T'; us[1] = '!';
  107   if (safewrite(fd, us, 2) != 2 ||
  108       saferead(fd, check, 2) != 2 ||
  109       check[0] != 'T' || check[1] < ' ')
  110     return -1;
  111 
  112   version = check[1];
  113   if (us[1] < version)
  114     version = us[1];
  115 
  116   switch (version)
  117     {
  118     case ' ': break;
  119     case '!':
  120       nonce[0] = platform;
  121       nonce[1] = platform >>  8;
  122       nonce[2] = platform >> 16;
  123       nonce[3] = platform >> 24;
  124       if (safewrite(fd, nonce, 4) != 4)
  125 	return -1;
  126       if (saferead(fd, nonce, 4) != 4)
  127 	return -1;
  128       //Unlike the more general SFProtocol.java this piece of code always knows what platform it is connected to; just   drop the preferred platform from the client
  129 //platform = nonce[0] | nonce[1] << 8 | nonce[2] << 16 | nonce[3] << 24;
  130       break;
  131     }
  132 
  133   return 0;
  134 }


Islam Hegazy escribió:
> Hi
>  
> What do you mean by following the SerialForwarder protocol? I create a 
> socket and connect it to the SF but I only receive T!- . I did another 
> client on Windows using C# and I did the same steps but it receives 
> normally through the socket...
>  
> Regards
> Islam Hegazy
>  
>  
>  
>  
>
>     ----- Original Message -----
>     *From:* Javier Barbarán Sánchez <mailto:barbaran at lcc.uma.es>
>     *To:* islheg at gmail.com <mailto:islheg at gmail.com> ;
>     tinyos-help at Millennium.Berkeley.EDU
>     <mailto:tinyos-help at Millennium.Berkeley.EDU>
>     *Sent:* Monday, June 04, 2007 2:03 AM
>     *Subject:* connecting to the SerialForwarder
>
>     Hello
>      
>     You must follow the SerialForwarder protocol, you can take a look
>     on it in
>     <tinyos_directory>\tools\java\net\tinyos\packet\SFProtocol.java
>      
>     Good luck
>