1. A method comprising: receiving, by a device, a geocast message; determining, by the device, if memory of the device comprises a message that was sent to a region containing a geographical source of the received geocast message; when it is determined that the memory of the device does not comprise a message was sent to the geographical region containing the geographical source of the received geocast message, composing, by the device, a response message; and geocasting, by the device, the composed response message.