Barrier coverage is one of the popular applications of Wireless Sensor Networks (WSNs). A barrier construction algorithm which takes into account both energy efficiency and fault tolerance is critical for the security of mission-critical regions. Sensor devices of a sensor network have the capability to monitor and understand the critical environment, and if part of the internet of things (IoT), they can communicate this information to a remote location for immediate action. This paper deals with the barrier coverage achieved through sensor nodes and communicate coverage information to a mission partner agency. The contributions of this paper are two folds. First, we propose a disjoint barrier construction algorithm based on the residual energy of sensors. Second, we propose an IoT-enabled paradigm to report barrier coverage information to a mission partner agency for immediate action. Simulation results show that the proposed algorithm improves barrier coverage and ensures better barrier lifetime compared to 2- barrier and LABC algorithms.