One way transmition by udp protocol.

WhistleS -> is UDP-sender service.
WhistleR -> is UDP-receiver service.

There is another service: udp_buffer_regulator, which will help to avoid udp-packets loss on the UDP-receiver side.

You can run "fakeroot dpkg-deb --build whistleR" or "fakeroot dpkg-deb --build whistleS" to buid .deb packages.

*********Configuration*********

Sender:
 1. dpkg -i whistleS.deb
 2. Incert into /etc/sysctl.conf next lines:  net.core.rmem_default=32777216
                                              net.core.rmem_max=32777216
                                              net.core.wmem_default=32777216
                                              net.core.wmem_max=32777216

3. Chouse network interface for WhistleS service, and set next settings:
   *change interface name in next file: /etc/udev/rules.d/70-persistent-net.rules
    
    SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:00:00:00:00:00", NAME="usb0"
    
    * set ip address for that interface in /etc/network/interfaces
    
    allow-hotplugin usb0
    iface usb0 inet static
    address 1.1.1.1
    netmask 255.255.255.252

4. Enable whistleS.service
   
   systemctl enable whistleS.service
   
5. Run whistleS.service

   systemctl start whistleS.service

6. Reboot the host.


Receiver:
1. dpkg -i whistleR.deb
2. Incert into /etc/sysctl.conf next lines:  net.core.rmem_default=32777216
                                             net.core.rmem_max=32777216
                                             net.core.wmem_default=32777216
                                             net.core.wmem_max=32777216
                                             net.core.netdev_max_backlog=10000
                                              
3. Chouse network interface for WhistleR service, and set next settings:
   *change interface name in next file: /etc/udev/rules.d/70-persistent-net.rules
    
    SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:00:00:00:00:00", NAME="usb0"
    
    * set ip address for that interface in /etc/network/interfaces
    
    allow-hotplugin usb0
    iface usb0 inet static
    address 1.1.1.2
    netmask 255.255.255.252                                     

4. Enable whistleR.service
   
   systemctl enable whistleR.service
   
5. Run whistleR.service

   systemctl start whistleR.service

6. Reboot the host.

/home/whistleS-data/outcome - directory for outgoing files on WhistleS (sender) host.
/home/whistleR-data/income - directory for ingoing files on WhistleR (receiver) host.

You can find logs in /var/log/whistleS or /var/log/whistleR dirs.
logrotate .conf files are in /etc/logrotate.d/ : whistleR.conf
                                                 whistleS.conf
                                                
.conf files of that services are in there root dirs: /etc/whistleR/whistleR.conf and /etc/whistleS/whistleS.conf.

***/etc/whistleS/whistleS.conf

whistleS_root_dir=/home/whistleS-data
logdir=/var/log/whistleS
port_dir=/etc/whistleS

***/etc/whistleS/whistleR.conf

whistleR_root_dir=/home/whistleR-data
logdir=/var/log/whistleR