This document presents a simulation-based method for the development of real time embedded systems. This kind of system is really sensitive to the communication with external environment and the Quality of Service (QoS) provided by the used target. So, the method is MDA-based and proposes to separate the concerns, introducing a communication layer with the outside environment, an application layer and a connection layer between these two layers. Then, it is possible to emulate each part on the system in order to validate it.