Hi,
I intend to use C for this, unless there is an easier way to do it. For my
application, UDP will work just fine as I'm not too concerned about packet
loss. And yes, I understand that HEX is a representation of binary data. I
simply wanted to know if this could be done from the BBB and if so, see if
there is a similar solution out there for new users. Thanks
On Tuesday, March 17, 2020 at 7:44:17 PM UTC-4, Dennis Bieber wrote:
>
> On Tue, 17 Mar 2020 15:16:57 -0700 (PDT), in
> gmane.comp.hardware.beagleboard.user Alex Rodriguez
>
> >Hey guys,
> >
> >I would like to have my BeagleBone Black output certain hex values over
> >Ethernet (either UDP or TCP) to another offline system. Is there a simple
> >way to go about doing this? If so, are there any specific examples of
> this?
> >Thanks!
>
> First: Define what you mean by "hex values"...
> Second: Study any textbook on network I/O (covering TCP/UDP) over
> sockets. Related: What language do you intend to use?
>
> Hexadecimal is a /display/ (text) encoding for binary data. If you
> really mean "hex", then you just need to convert the binary data to a
> string, and send the string.
>
> >>> hxstr = "%8.8X" % 123987456
> >>> hxstr
> '0763E600'
> >>> print(hxstr)
> 0763E600
> >>>
>
> {gets uglier for floating point -- one needs to use struct module to pack
> the float into a bytestring, then unpack the bytestring as an integer}
>
> If you mean arbitrary binary values, you need to pack them into a
> byte
> array and send the byte array -- though this does introduce the next
> factor...
>
> ... TCP is a stream protocol -- it ensures that you will receive
> the sent
> data, but does not guarantee that you will receive the same number of
> packets as sent. It can split packets into multiple receive calls, or join
> multiple send packets into a single packet. It is up to YOU to define the
> high-level protocol that allows you to know if you have received all of a
> transmission (for example -- you send a count of how many bytes are to
> follow... Many of the text protocols use a line that contains just a ".").
>
> ... UDP, on the other hand, does not split/combine packets -- what
> you
> receive IS what was sent. However, it does not guarantee delivery! Any
> individual packet can be lost/undelivered. It is up to YOU to define a
> protocol that lets you detect lost packets (unless your application can
> live with missed packets).
>
>
> --
> Dennis L Bieber
>
>
--
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