Reads one command of an application layer package.
uplink says which way the frame carrying it traveled, because the same identifier names
a different command in each direction. A data fragment takes the whole message, as
TS004-2.0.0 section 3 asks, and its bytes come back on data.
Reads one command of an application layer package.
uplinksays which way the frame carrying it traveled, because the same identifier names a different command in each direction. A data fragment takes the whole message, as TS004-2.0.0 section 3 asks, and its bytes come back ondata.