Re: [Anima] GRASP M_FLOOD captured from Reggie.py -- could it be wrong?

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 14 December 2020 00:47 UTC

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To: Carsten Bormann <cabo@tzi.org>, Michael Richardson <mcr+ietf@sandelman.ca>
Cc: anima@ietf.org
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Mon, 14 Dec 2020 13:47:03 +1300
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Subject: Re: [Anima] GRASP M_FLOOD captured from Reggie.py -- could it be wrong?
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This isn't yet definitive because I don't have everything I need on vacation
with me, but

> So the packet decode you captured is right

I think I agree with Carsten. In CDDL, +[something] generates
[something1],[something2],[something3], and not
[[something1],[something2],[something3]].

Nesting is hard. That's why a CDDL-driven parser would be a great
thing to have.

Regards
   Brian

On 14-Dec-20 10:08, Carsten Bormann wrote:
> You forced me to get a bigger screen...
> 
> I don’t know what you are trying to say here:
> 
>> On 13. Dec 2020, at 20:43, Michael Richardson <mcr+ietf@sandelman.ca <mailto:mcr+ietf@sandelman.ca>> wrote:
>>
>> I guess I'm still confused by why this is:
>>  [ [objective1],[locator2-option], [objective2],[locator2-option],...]
>>
>> and not:
>>  [ [objective1, locator2-option], [objective2, locator2-option],...]
>>
>> or maybe:
>>  [ [[objective1], [locator2-option]], [[objective2], [locator2-option]],…]
> 
> An objective already is an array, so there is little point in putting array brackets around one.
> 
> [foo, bar, baz, bat, [obj1, loc1]]
> 
> Is a valid instance as is
> 
> [foo, bar, baz, bat, [obj1, loc1], [obj2, loc2]]
> 
> So the packet decode you captured is right, and the version with the added one-element array (0x81) does not match the CDDL.
> 
> (Both obj1 and loc1 are four-element arrays in your example.)
> 
> Grüße, Carsten
>