1. A wireless network comprising: a plurality of nodes that communicate over wireless communication links; wherein a virtual site is established at a primary node included in the plurality of nodes; wherein a backup node is selected for the virtual site from the plurality of nodes; wherein when the primary node is able to do so, the primary node performs predetermined processing for the virtual site and replicates at the backup node data related to the processing; and wherein when the primary node is unable to perform the processing, the backup node performs the processing for the virtual site using at least some of the data replicated at the backup node; wherein at least one of the plurality of nodes receives sensor data from a sensor.