Logistics apparatus and method for identifying empty/full state of logistics apparatus

A logistics apparatus, comprising:

• a physical mechanism for stacking, such that the logistics apparatus can be stacked in an empty state;
• a wireless transceiver module, disposed on a base or a side plate or a lid of the apparatus;
• the wireless transceiver module is configured to transmit wireless signal and receive wireless signal from the wireless transceiver module disposed on other apparatuses;
• an arbiter, coupled to the wireless transceiver module and configured to detect whether the wireless transceiver module currently receives a wireless signal from another logistics apparatus and output an electrical signal indicating the result;
• wherein the maximum effective communication distance of the wireless transceiver module is S, and disposed position of the wireless transceiver module satisfies following conditions:
• when multiple logistics apparatuses are stacked in the empty state, the linear distance between the wireless transceiver modules of two adjacent logistics apparatuses is less than S;
• when multiple logistics apparatuses are in the full state, the linear distance between the wireless transceiver modules of two adjacent logistics apparatuses is greater than S.