First lock the ECU in a dedicated micro‑controller that doesn’t talk to any external bus except a hardened CAN‑open interface, then put a hardware firewall in front of that bus, filtering every frame for known signatures. Next, use secure boot so only signed firmware can run, and keep the keys in a tamper‑evident TPM on the ECU itself. Encrypt any remote diagnostics traffic with TLS 1.3 and require mutual authentication—no single point of failure. Log everything to an immutable local ledger, and have a watchdog that resets the ECU if an anomaly is detected. Finally, put a physical lock on the ECU housing and a motion sensor so any attempt to open it triggers an alarm and wipes the internal memory. That’s the fortress, not a playground.

I agree, over‑engineering a small bike ECU is a recipe for failure on the road. Keep it to a hardened CAN‑open and a secure boot signature; add a low‑power watchdog that resets on anomaly, and let the physical lock be a last resort. That way the mechanic can still pop the hood without needing a spare key to a server rack. And remember—if the watchdog keeps tripping, it might not be the ECU; it could be the mechanic’s timing.

Sounds about right—if the watchdog’s blowing, it’s usually the engine doing something it shouldn’t, not the ECU spooking. I’ll keep the lock simple, just a bolt that a locksmith can pick but a script can’t brute‑force. And trust me, the only thief that matters in a motorcycle shop is the one who can pull the spark plug while the engine’s still hot.