I have a Moto G3 and a 2007 S-class with the Sap V3 module.
I could pair the phone and the dongle following the instructions here:http://www.mercupgrades.com/manuals/cra ... manual.pdf
The android rsap app reports that the phone is connected, but t does not work.
The car reports no phone signal and if I try to recall the recent calls it just hangs on a dialog saying that it is receiving data from the phone.
I'm attaching a log, even though it doesn't look like there's a lot of useful info there.