Advanced Metering Infrastructures ({AMI}s) lay the foundation of a wide variety of smart grid applications. Despite their low capacity, RF-mesh systems are an increasingly popular option for AMI implementation. In this paper, we present a simulator framework of realistic RF-Mesh {AMI} with the objective of analyzing the performance of this kind of system, and defining the feasibility of possible smart grid applications. The framework yields a simulation tool, implemented on Java and Python, that permits the simulation of large scale {AMI}, while taking into account important technical details in a reasonable amount of time.