A method of communicating between a terminal device and a back-end system assigned to the terminal device, the terminal device receives via a direct wireless communication link an authorization code from the mobile communication device. Responsive to receiving the authorization code, the terminal device transmits via the direct wireless communication link to the mobile communication device a terminal report message which includes a message content part and a message addressing part. The mobile communication device transmits the terminal report message in a forwarding message via a telecommunications network to a remote message processing system determined by the addressing part. The remote message processing system determines from the addressing part the back-end system assigned to the electronic terminal device and transfers the content part of the terminal report message to the back-end system.