An assembly for installation in a fuel dispensing environment having a forecourt controller and at least one fuel dispenser communicating via legacy cable. The assembly comprises a sniffer device connectable along the legacy cable such that a first communication side thereof is in electrical communication with the forecourt controller and a second communication side thereof is in electrical communication with the fuel dispenser. The sniffer device is operative to receive an incoming message at either the first communication side or the second communication side. The sniffer device also includes memory and a processor, the processor implementing instructions to interpret the incoming message. Based on an interpretation of the incoming message, the sniffer device is operative to determine an action to be taken regarding the incoming message.