I am the assigned ART-ART reviewer for this draft.

Summary:
I have some minor concerns about this document that I think should be resolved before publication.

Comments:
I think this document is basically ready for publication.

Major Issues:
"No major issues found."

Minor Issues:
Where the "C_R" is actually carried is not clear. It would be good if the following text in Section 3 could be more clear about it, and it might also be helpful to show the "C_R" in Figure 2.
"     EDHOC data consisting of the pair (C_R, EDHOC message_3) required
      for completing the EDHOC session.  Note that, as specified in
      Section 3.2, C_R is transported in the OSCORE Option of the OSCORE
      Request rather than in the CoAP payload of the EDHOC + OSCORE
      request. 
"