This app is for the LONDINIUM model R lever espresso machine that has the pressure transducer (digital pre-infusion) module and wireless dongle installed. It will not have any effect on a LONDINIUM model R that does not have both of these components installed. This app allows you to alter the pre-infusion pressure and the pump delay from your phone or tablet. Low pre-infusion pressures should be matched with a low pump delay value and longer pump delays for high pre-infusion values. Dark roa