The Contiki 2.5 examples/rest-server example fails when using mspsim that incorporates the following commit. The symptom is that the node ID is not correctly provided to individual motes, and the RPL network does not form.
commit e53500c3e2c0d8f4cfed93d098d6711663ea6644
Author: Joakim Eriksson <joakime@sics.se>
Date: Mon Aug 29 22:20:36 2011 +0200
moved IOPort setup from core to config