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The scope of this paper is to present contemporary communication aspects regarding the employment in future of smart grid as a wireless ecosystem. A wide rigorous survey on wireless access and network technologies ideal for smart grid networks is conducted, and we present applicable technologies like Internet of Things (IoT) and Machine-to-Machine (M2M) communications. Moreover, we present key topics of security, privacy and cryptography. Indeed, multimedia services will be provided in a wireless communications environment of a smart grid, while Quality of Service (QoS) as well as security audit shall always be crucial dimensions during a communication network modelling and planning. More specifically, the objective of our work is concentrated on the study of smart grid communications topics and security evaluation using a simulation environment and to demonstrate some interesting results.