file specifies the name of the file to be retrieved
Anetd by default uses the directory $(anetd_var)/clientip
to look for the file <relative_path/file>. Anetd only allows the
client that originally created the file file to retrieve it. The
content of the file is returned to the client in the acknowledge
message. The file returned cannot be greater than approximately 64K
bytes, since this is the maximum payload of an ANEP packet, and we are
using ANEP as datagram. Larger files are truncated to their maximum
allowed size. The GET command returns (at most) the first 64K of
the file, while the TGET command returns (at most) the last 64K of
the file.