OCSDK UART Handling

Hi, 

I'm trying to use UART RAW of OCSDK.

It is OK for small data packet TX and RX side.

The problem is the UART can't handle bigger datas i.e. 4Kbytes on receive side.

Does the UART of Mote receive 4 KB of data?

How can I get it?

Best Regards,

Yasu