1. A tracking device, comprising: a transceiver configured to transmit and receive signals; a communication interface coupled to the transceiver and configured to: broadcast a beacon signal via the transceiver, the beacon signal detectable by one or more mobile devices in proximity to the tracking device, and establish a communicative connection with a mobile device; and a controller coupled to the communication interface and configured to: broadcast a first series of beacon signals via the communication interface and the transceiver, the first series of beacon signals separated in time by broadcast intervals determined based on a first behavior model stored on the tracking device, receive a second behavior model over the communicative connection from the mobile device, wherein the mobile device is configured to send the second behavior model to the tracking device in response to receiving the second behavior model from a tracking system, store the second behavior model on the tracking device, and broadcast a second series of beacon signals via the communication interface and the transceiver, the second series of beacon signals separated in time by broadcast intervals determined based on the second behavior model.