hey Andrew, thanks for the help,
serial monitor not happy yet to test,
yes im using arduino uno, I did
Easiest way to test functionality is to use a blank sketch (no Serial.begin) and just open the serial monitor (at 115200). If you type "AT", you should get an "OK" back from the mDot
but no response yet from the serial monitor.
Thanks getting there 
I ordered the mDot programmer [devKit], so is easier to user, also 10 mdots to start having fun...
Will continue checking this arduino interface, Thanks!