Finally I persevered and got the CanChecked monitor communicating with the ECU with a custom boot up screen. Still lots more it can be set up to do, max/min alarms etc. I don’t think the software is very intuitive and it required to be disconnected and connected from the PC more time than enough during set up due to spurious faults that remarkably disappeared on power up.
It takes analog inputs and I have a BMW mini ambient temperature sensor to connect next. Expecting the same protracted procedure to get that working.