[Unit]
Description=Debug Network Info to Serial
After=network-online.target eco-daemon.service
Wants=network-online.target

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/bash -c 'echo "=== NETWORK DEBUG ===" > /dev/ttyS0; ip addr >> /dev/ttyS0; echo "=== ROUTES ===" >> /dev/ttyS0; ip route >> /dev/ttyS0; echo "=== LISTENING ===" >> /dev/ttyS0; ss -tlnp >> /dev/ttyS0; echo "=== NM STATUS ===" >> /dev/ttyS0; nmcli device status >> /dev/ttyS0 2>&1; nmcli connection show >> /dev/ttyS0 2>&1; echo "=== END DEBUG ===" >> /dev/ttyS0'

[Install]
WantedBy=multi-user.target