This software can be used for TCP messaging test tool. Server and Client mode can not be run at the same time. You should run this modes from different machines.
Enable snaps on Debian and install Easy TCP Server/Client Tool
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Enable snapd
On Debian 9 (Stretch) and newer, snap can be installed directly from the command line: