[Tinyos Core WG] Fwd: CC2420 Security Support Documentation

[Miklos Maroti]

Hi Phil,

On Wed, Jul 1, 2009 at 8:16 PM, Philip Levis<pal at cs.stanford.edu> wrote:
>
> On Jul 1, 2009, at 11:14 AM, Miklos Maroti wrote:
>
>> Hi John,
>>
>>> The CC2420SecurityMode is only active for the next AMSend.send command.
>>> You
>>> can set different security options for different messages on a per
>>> message
>>> basis. The security header is attached when an AMSend is called through a
>>> SecAMSend interface.
>>
>> I find that rather strange in an event driver OS. You CANNOT be sure
>> that no other module is going to call AMSend in between your calls.
>
> If it's sync code, you can be.

Oh, you are completely right, my bad.

Why did we choose with PacketAcknowledgements, PacketLink,
PacketTimeSync to pass in the message buffer? What is fundamentally
different with packet  security modes than with other packet options?

Miklos