For the Raspberry Pi, tooling over serial port is not supported. The simplest solution is to use standard IP networking over Ethernet. This can be a direct connection between the PC and the Raspberry Pi, as long as the cable is twisted and the IP addressing is correct (e.g. manual IP addressing or DHCP server on the PC).
Regarding "Connecting to a UART Device": This is meant for attaching and controlling serial devices from the Raspberry Pi, not for tooling connections between the Raspberry Pi and the PC.
Hope this helps,
That was quick.
Anyway, many thanks for your help, even though I now have to persuaed my Head-of-Security there is no other way as to use IP networking over Ethernet to access the PI via SDK-DeviceManager.
Cheers! and may you do well with the Java Me 8 Challenge !
Thanks for your understanding and interest. We will expand the tooling support over the next releases, but for now Ethernet is certainly easiest and most reliable.