Serial file transfer protocol / checksums Post: 302786525

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Top Forums Programming Serial file transfer protocol / checksums Post 302786525 by nidal on Wednesday 27th of March 2013 04:24:00 PM

03-27-2013

Registered User

For polarization you havent got my point, for the PC its a rs232, but in the board side its not, its a TTL level UART, and not a rs232.

As i told you, i'm working on replacing an existing application, using that one on the same STB and with the same firmware version gives the same communication frames, the same checksums and everything is the same everytime i repeat the process on the same conditions, so those are static just depending on the firm binary file to calculate its size and checksums that i listed some of,
what i've done is spying the link between the linux PC and the board with a simple sniffering home made cable and a spying home developed software, i've got that communication, analysed it as i shown first, and tried to reconstruct that communication in a windows application,
in this application i used the same board and same binary file and used the same headers and expected the same responses, what i got is that it works till the first kbyte is sent, it gives me the right header as a response from the board

Quote:

t0[12]={0x18, 0x72, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x45, 0x30, 0x44, 0xB2},
t1[12]={0x18, 0x72 ,0x00 ,0x04 ,0x00 ,0x00 ,0x04 ,0x00 ,0x21 ,0x5C ,0x81 ,0xB6},

and after that (by sending the rest of file) the board responds 5 times with t1 and then quit downloading mode to show "booting the kernel..." so it failed to receive the second kbyte

what you will notice is that the kernel is ok and that the firmware is already installed before, yes it is, and same in this case when i download the firmware on it again and again using the linux PC it succeeds and shows the same checksums,
i analysed well what i got in the communication but i think that there is something special in the used protocol, maybe timing or i dont know what exactly thats why i wanted to know more about file transfer protocols,
i found a protocol too much similar to what i analysed called MODBUS but still not the same so i think its not a usual protocol.

The STB manufacturer is the company i'm doing my training with, but the developers are from other company and are not responding at all...

nidal

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LEARN ABOUT DEBIAN

pppob

PPPOB(1)						      General Commands Manual							  PPPOB(1)

NAME

       pppob - Barry Project's program to access the Blackberry modem for pppd

SYNOPSIS

       pppob [-l filename][-p pin][-P password][-s][-v]

DESCRIPTION

       pppob  is a program suitable for use in pppd's pty option file.	It talks to an available Blackberry and provides modem access on stdin and
       stdout.

OPTIONS

       -l filename
	      Causes verbose debug output from the -v switch to be written to filename instead of stderr.

       -p pin PIN of device to talk with.  Only needed if you have more than one Blackberry connected at once.

       -P password
	      Simplistic method to specify device password.  In a real application, this would be done using a more secure prompt.

       -s     Use Serial mode instead of the default IpModem mode.  Older Blackberries used a serial mode based on  a  similar	protocol  to  what
	      database	access	uses  for  retrieving  data.   Each packet had a size and socket number prepended to the actual modem data.  Newer
	      Blackberries have dedicated USB endpoints that behave as read/write points, and do not bother  with  this  size/socket  format,  and
	      therefore  transfer less data across the USB bus.  By default, pppob tries to use IpModem mode if proper endpoints are detected, and
	      otherwise falls back to Serial mode.  This switch skips IpModem mode entirely and tries Serial mode immediately.

       -v     Dump verbose protocol data to stderr during operation.

AUTHOR

       pppob is part of the Barry project.

SEE ALSO

       http://www.netdirect.ca/software/packages/barry

								   May 29, 2008 							  PPPOB(1)