hikvision-isup-client/systemd/hikvision-isup.service

# Raspberry Pi 5 (Bookworm / systemd) service unit.
# install: sudo cp systemd/hikvision-isup.service /etc/systemd/system/
#          sudo systemctl daemon-reload && sudo systemctl enable --now hikvision-isup
[Unit]
Description=Hikvision ISUP5.0 device client (Pi5)
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
# real production build (needs aarch64 libHCNetSDK.so under ./libs)
WorkingDirectory=/opt/hikvision-isup-client
ExecStart=/opt/hikvision-isup-client/build/hikvision-isup-client-aarch64-real -c /opt/hikvision-isup-client/config.ini
Restart=on-failure
RestartSec=5
# ISUP/Ehome device registration may bind ephemeral ports; keep it non-root
User=pi
Group=pi
LimitNOFILE=65535
# Pi5 8GB: cap RSS well under memory; bump if more channels added
MemoryMax=1G
ProtectSystem=full
ReadWritePaths=/opt/hikvision-isup-client

[Install]
WantedBy=multi-user.target