With RX command you can receive one or more bytes in HEX notation from external UART of Carberry.

UART RX [<LEN>]

RX accepts an optional parameter indicating the maximum number of data bytes to read from UART.

RX command returns one (or more) bytes in HEX notation read from UART, followed by a line containing OK.
If there are no bytes waiting for reading, the command returns only OK line.

Receiving some data bytes:

UART RX
00112233445566778899AABBCCDDEEFF
OK

UART RX
OK

Receiving a maximum of eight characters at a time:

UART RX 8
0011223344556677
OK
  
UART RX 8
8899AABBCCDDEEFF
OK

UART RX 8
OK