Simple queue system to transfer files using UDT. Download the library for UDT from http://udt.sourceforge.net/ or

apt install libudt-dev
yum install udt-devel

There are 3 programs: sender and receiver are daemons to run on the source and target machine; submit is a program to submit a file to be transferred.

Run "build" to compile, and move the executables to a suitable place. Add "udt-copy" to /etc/services, using any port number (above 1024) that is not in use on your system.

To install:

mv receiver /usr/local/etc
mv receiver submit /usr/local/bin
mv sender /usr/local/etc

If you are using systemd, copy and paste this content into /etc/systemd/system/udt.service

[Unit]
Description=Send and receive files using UDT
After=network.target

[Service]
ExecStart=/bin/dash -c "/bin/rm -f /var/run/udt && /usr/bin/mkfifo -m 666 /var/run/udt && /usr/local/etc/receiver && /usr/local/etc/sender /var/run/udt"
KillMode=process
Restart=on-failure

[Install]
WantedBy=multi-user.target

Then run

systemctl daemon-reload
systemctl enable udt.service
systemctl start udt.service

If you are not using systemd, put these into /etc/rc.local:

mkfifo /var/run/udt && chmod 666 /var/run/udt
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib /usr/local/etc/sender /var/run/udt 2>&1 >> /var/log/udt&
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib /usr/local/etc/receiver 2> /var/log/udt&

Then to copy a file from a sending machine to the receiver named "server1"

submit /var/run/udt server1 /tmp/foo