1. A method comprising: receiving a first input from a first sensor at a first sensor node of a wireless ad hoc network; comparing the first input to a first predefined input threshold associated with an intrusion activity at the first sensor node; and wirelessly communicating an indication of the intrusion activity from the first sensor node to a gateway device via a second sensor node of the wireless ad hoc sensor network, wherein the gateway device comprises an interface between the wireless ad hoc sensor network and a user-interactive system configured to monitor the wireless ad hoc sensor network.