Tengfei, 

Trying to understand you point about " handle Sixtop ADD Response with return 
code SUCCESS but 0 cells in cellList " 

If the response code is SUCCESS, IMO that means option 1. if option 2 is 
happening (I assume you mean "there is no memory for allocating more cells"), I 
would expect another return code, no? 

THomas 

________________________________________ 

Thomas Watteyne, PhD 
Sr Research Scientist & Innovator, Inria 
Sr Networking Design Eng, Analog Devices 
Founder & Advisor, Wattson Elements/Falco 
Founder & co-lead, UC Berkeley OpenWSN 
Co-chair, IETF 6TiSCH 

www.thomaswatteyne.com 
________________________________________ 

> De: "tengfei chang" <[email protected]>
> À: "6tisch" <[email protected]>
> Envoyé: Lundi 12 Août 2019 08:52:37
> Objet: [6tisch] draft-ietf-6tisch-msf-06 is published

> Dear all,
> The draft-ietf-6tisch-msf-06 is just published, it mainly resolved what we
> discussed during the IETF meeting.

> - add rules for celllist
> - update the downstream cell adaptation strategy

> Right now, there is one issue remained to be resolved and I am not sure what 
> is
> the right solution. So I need suggestions and feedback from you:

> - handle Sixtop ADD Response with return code SUCCESS but 0 cells in cellList

> There are two possible reason for this situation
> 1. the proposed celllist doesn't meet the requirement from neighbor side
> 2. there is schedule memory for adding more cells.

> For the 1st reason, the node may try to send another 6P request later.
> For the 2nd reason, the node may switch to another parent but it's layer
> violated.

> Any solutions for this case?

> Tengfei

> --
> Chang Tengfei,
> Postdoctoral Research Engineer , Inria

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