canbussniffer hangs on shutdown

[rzblue]

canbussniffer hangs until systemd times it out after 90s and kills it.

Dec 22 07:06:41 robot systemd[1]: Started Limelight CAN Bus Sniffer.
Dec 22 07:06:41 robot canbussniffer[352]: === Limelight CAN Bus Sniffer ===
Dec 22 07:06:41 robot canbussniffer[352]: Commit: e687e3815f76c1c5ea9fb52b6558bedfe53ab117
Dec 22 07:06:41 robot canbussniffer[352]: Built: 2025-12-16 07:18:31 UTC
Dec 22 07:06:41 robot canbussniffer[352]: =================================
Dec 22 07:06:41 robot canbussniffer[352]: Starting WebSocket server on port 5800
Dec 22 07:06:41 robot canbussniffer[352]: Listening on port 5800
Dec 22 07:06:41 robot canbussniffer[352]: CAN receive thread started
Dec 22 07:07:11 robot canbussniffer[352]: WebSocket client connected
Dec 22 07:07:24 robot systemd[1]: Stopping Limelight CAN Bus Sniffer...
Dec 22 07:07:24 robot canbussniffer[352]: CAN receive thread stopped
Dec 22 07:08:54 robot systemd[1]: limelight_canbussniffer.service: State 'stop-sigterm' timed out. Killing.
Dec 22 07:08:54 robot systemd[1]: limelight_canbussniffer.service: Killing process 352 (canbussniffer) with signal SIGKILL.
Dec 22 07:08:54 robot systemd[1]: limelight_canbussniffer.service: Main process exited, code=killed, status=9/KILL
Dec 22 07:08:54 robot systemd[1]: limelight_canbussniffer.service: Failed with result 'timeout'.
Dec 22 07:08:54 robot systemd[1]: Stopped Limelight CAN Bus Sniffer.