A method for transmitting a response message in response to an incoming message, wherein the incoming message comprises a header portion and a payload, wherein the response message also comprises a header portion and a payload, wherein the header portion of the incoming message is identical to the header portion of the response message, wherein the payload of the incoming message is different from the payload of the response message, the method comprising receiving an incoming physical signal representing the incoming message, this step comprising receiving a header part of the incoming physical signal, the header part representing the header portion of the incoming message, and thereafter receiving a payload part of the incoming physical signal, the payload part representing the payload of the incoming message, and splitting the incoming physical signal into a first copy of the incoming physical signal and a second copy of the incoming physical signal, and providing the first copy of the incoming physical signal to a transmitter system so that at least part of the first copy's header part is transmitted, and interpreting at least part of the second copy of the incoming physical signal to determine that a message is received, and generating a signal, and based on determining that a message is received, providing the generated signal to the transmitter system so that the generated signal is transmitted after the at least part of the first copy's header part has been transmitted, wherein the transmitted at least part of the first copy's header part and the transmitted generated signal together form a transmitted response signal representing the response message. the incoming message comprises a header portion and a payload, wherein the response message also comprises a header portion and a payload, wherein the header portion of the incoming message is identical to the header portion of the response message, wherein the payload of the incoming message is different from the payload of the response message, the method comprising receiving an incoming physical signal representing the incoming message, this step comprising receiving a header part of the incoming physical signal, the header part representing the header portion of the incoming message, and thereafter receiving a payload part of the incoming physical signal, the payload part representing the payload of the incoming message, and splitting the incoming physical signal into a first copy of the incoming physical signal and a second copy of the incoming physical signal, and providing the first copy of the incoming physical signal to a transmitter system so that at least part of the first copy's header part is transmitted, and interpreting at least part of the second copy of the incoming physical signal to determine that a message is received, and generating a signal, and based on determining that a message is received, providing the generated signal to the transmitter system so that the generated signal is transmitted after the at least part of the first copy's header part has been transmitted, wherein the transmitted at least part of the first copy's header part and the transmitted generated signal together form a transmitted response signal representing the response message.