[GMCG44]

What RoboDK driver did you use as a baseline?
You can usually run RoboDK Python Drivers in a console and send commands manually to see if they work.

robotDK-MRC-driver/driver.py at master · glumb/robotDK-MRC-driver · GitHub

This is the driver I used and as I said I know the driver works outside of robodk.

Also when connecting to the robot though robodk it is reading the driver because it says in the log
'MRC remote
use CONNECT to open a connection'
which is a print command from the driver.

I think its accessing it but then maybe there is a problem with the serial connection to the robot through robodk?
But this would be strange since it connects fine without robodk.