TFTP server use command in BusyBox

Parameter description:
-L is the local abbreviation, followed by the source file name that exists in the client, or the file name that was renamed after the client was downloaded.
-R is the abbreviation for remote, followed by the source file name in the root directory of the server, the TFTP server of the PC, or after the server is uploaded.
-G is an abbreviation for GET, used when downloading files,
-P is the abbreviation for put, used when uploading files,
TFTP uses 69 ports by default.

Download:
Tftp-g-L a.txt-r a.txt 192.168.1.1
Upload:
Tftp-p-L a.txt-r a.txt 192.168.1.1

TFTP server use command in BusyBox