During this new world pandemic, a lot of technical issues have come to life, forcing all industries to reinvent themselves and how the day to day operations are performed. Remote working has become not only a trend but a necessity. Starting from online lecturing to online meetings on a need to know basis, people are concerned about their privacy and security in the online environment. Thus, in this paper, we focus our attention to the concepts of trust and reputation models in Wireless Mobile Networks (WMN), Wireless Sensor Networks (WSN) more accurately, for secure routing of large data packets with respect to Quality of Service (QoS). This paper analyses the current context in wireless mobile networks, more specifically in wireless sensor networks, and proposes a novel adaptive method to evaluate it by defining a Markov based trust function and a new model to manage it.