Quick update on the Java ME Embedded 8.1 Developer Preview that was released on Sunday:
Some developers have reported problems with connecting the FRDM-K64F to the ME SDK Device Manager over USB as well as the inability to set static IP addresses on the FRDM-K64F. We have seen this as well and are working on fixing the issues.
In the meantime, the most reliable way to connect the FRDM-K64F to the ME SDK 8.1 EA #3 is to use DHCP addressing on the FRDM-K64F and then connect to the Device Manager via IP.
Also, please be sure to NOT run the ME SDK Device Manager and the manual proxy at the same time – they will conflict. To get started it is best to just use the ME SDK 8.1 (make sure to use version EA #3) and connect via the Device Manager to make sure tooling works that way.