With RECV command you can receive one or more ASCII characters from external UART of Carberry.

UART RECV [<LEN>]

RECV accepts an optional parameter indicating the maximum number of characters to read from UART.

RECV command returns one (or more) line(s) containing the characters read from UART, followed by a line containing OK.
If there are no characters waiting for reading, the command returns only OK line.

Receiving some characters:

UART RECV
Hello World!
OK

UART RECV

OK

Receiving a maximum of eight characters at a time:

UART RECV 8
Hello Wo
OK

UART RECV 8
rld!
OK

UART RECV 8
OK