This document describes how to set different packet reception rates (PRR), received signal strength indicators (RSSI), and link quality indicators (LQI) for individual links in a Cooja simulation. It explains that the Directed Graph Radio Medium (DGRM) radio model must be used, and that each link's properties can then be configured individually by accessing the simulation tools and editing the links. Specific steps are provided for adding new links and configuring the PRR, RSSI, and LQI values of each link.