Bi-directional communication system for logistic tracking

A method of operating a bi-directional communication system between a plurality of communication devices which comprise at least one communication controller and a plurality of nodes including a first node, the method comprising:

• periodically broadcasting a beacon signal from said communication controller at a broadcast interval via a channel of a first host, said beacon signal containing a first address of said communication controller;
• periodically scanning said beacon signal on said first host by said first node;
• upon detecting of said beacon signal by said first node, transmitting an identification payload from said first node to said communication controller;
• and
• upon receipt of said identification payload by said communication controller;
• transmitting an acknowledgement signal to said first node;
• wherein said acknowledgement signal further contains a command instructing at least one subsequent action to be taken by said first node;
• wherein said at least one subsequent action is said first node entering sleep mode.