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In Internet of Things (IoT) sensory environment Wireless Sensor Networks (WSNs) are connected to the Internet through gateways and this gives birth to many real time sensor based applications. Applications from Internet querying for Spatio-temporal information within WSN may require query decomposition. Decomposition of queries may result in tasks having similar functional and Quality of Service (QoS) requirements. Thus pre-processing the tasks results in decreased number of task executions within WSN as compared to executing tasks individually. Moreover prior knowledge of sensor nodes’ residual energy can help in deciding if a task can be scheduled for its successful completion. Existing energy monitoring protocols in WSNs incur considerable amount of message traffic and energy. Thus an Energy Monitoring System (EMS) that works on reduced message traffic and yet provide the correct energy …