A system is disclosed comprising a non-transitory, computer-readable storage device storing software. The software, when executed by a processor, causes the processor to perform the following operations for each of a plurality of non-functional electronic devices: count a number of other non-functional electronic devices within a defined distance from the non-functional electronic device; and define the non-functional electronic device to be a core electronic device if the counted number is at least a threshold value, wherein threshold value is based on a total number of electronic devices within the defined distance around the non-functional electronic device. For each core electronic device, the software, when executed by a processor, further causes the processor to form a neighborhood group comprising the core electronic device and other non-functional electronic devices within the defined distance around the core electronic device.