Allows you to connect a Tag Heuer CP540/545 chronoprinter to an internet server to transfer timing data in real time. The CP545 has an optional 2G GSM docking (no 3G or 4G). In France, Switzerland, Reunion, and other European countries, the 2G network is gradually being phased out. The CP545 can therefore sometimes no longer connect to a server via the internet. This app serves as a gateway between the chronoprinter and the internet, using the phone's 3G/4G/5G network. The connection between the mobile and the chronoprinter is either via Ethernet with an RJ45 adapter or via RS232 with a USB-C/RS232 adapter. Operation of the app requires the use of 2 software keys: one to identify the customer, the other to identify the rally. Each key has a limited duration. The app can only connect to the internet server if a chronoprinter is correctly identified beforehand (otherwise there is no point in connecting to the server).