[OpenTRV-dev] FAQ 11: is it safe to do without the CRC on secure frames?

Jeremy Poulter jeremy at bigjungle.net
Sat Dec 19 21:23:54 GMT 2015

Absolutely, definitely not suggesting changing the current projects, you
would never finish anything if you constantly changed to the
latest/greatest. Just for new stuff or if you hit hardware limitations look
outside of the AVR/HopeRF combination.

But again I am fueling an off topic discussion.

On 19 Dec 2015 20:35, "Damon Hart-Davis" <dhd at exnet.com> wrote:

> > On 19 Dec 2015, at 20:07, Jeremy Poulter <jeremy at bigjungle.net> wrote:
> >
> > If you are short on space then definitely drop it. Your security layer
> should cover verifying the frame content, if it does not the communication
> is not secure ;-)
> >
> > As you have mentioned you are fixed with the AVR plus Hope RF module for
> now but there are some awesome combination MCU/radio chips coming out, eg
> the nRF52. Think they quoted sub 10mA when TX/Rx and the sleep power was
> ridiculously low. All that and a good CPU (ARM Cortex), floating point,
> Bluetooth, NFC and loads of other goodies.
> Indeed, but I want to try to avoid forcing the use of “the next level up”
> on MCU or radio hardware, for OpenTRV and Launchpad.
> I really really may be wrong, but this is my hunch for now and I’m
> sticking with it absent an extraordinary counterargument!  And there may be
> enough oversights in the format that need fixing that all this becomes moot.
> Rgds
> Damon
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