ax25ipd.conf

# /etc/ax25/ax25ipd.conf
socket udp 10095
mode tnc
device /var/ax25/pty/axip1
speed 115200
loglevel 2
broadcast QST-0 NODES-0
route REMOTECALL remote.hostname d

ax25ipd.service

# /etc/systemd/system/ax25ipd.service
[Unit]
Description=AX.25 over IP (AXIP) daemon
After=network.target
StartLimitInterval=0

[Service]
Type=simple
Restart=always
RestartSec=5
ExecStart=/usr/sbin/ax25ipd

[Install]
WantedBy=multi-user.target

kiss-socat-axip.service

# /etc/systemd/system/kiss-socat-axip.service
[Unit]
Description=Socat interconnect for AX25 AXIP
After=network-online.target
Wants=network-online.target

[Service]
WorkingDirectory=/var/ax25
ExecStart=socat -d -d -ly pty,raw,echo=0,link=/var/ax25/pty/axip1 pty,raw,echo=0,link=/var/ax25/pty/axip2
ExecStartPost=/usr/bin/bash -c 'while ! [ -h /var/ax25/pty/axip2 ]; do sleep 1 ; done'
ExecStopPost=rm /var/ax25/pty/axip1 /var/ax25/pty/axip2

[Install]
WantedBy=multi-user.target

kiss-tnc@.service

# /etc/systemd/system/kiss-tnc@.service
[Unit]
Description=AX25 KISS TNC %I

[Service]
ExecStart=/usr/sbin/kissattach $TNC_TTY %i
ExecStop=pkill -f "kissattach $TNC_TTY %i"
ExecStartPost=/usr/bin/bash -c 'while ! /usr/sbin/kissparms -c 1 -p %i; do sleep 1; done'
TimeoutStopSec=5
[Install]
WantedBy=multi-user.target

override.conf

# /etc/systemd/system/kiss-tnc@axip.service.d/override.conf
[Unit]
After=kiss-socat-axip.service
[Service]
Environment=TNC_TTY=/var/ax25/pty/axip2