Notes on heat,
and building on Tesla's API
What actually heats a parked car, how Tesla's signed-command protocol works under the hood, and the incidents we've hit building VentMode on top of it.
We renamed our Tesla Fleet API app and it silently unregistered our domain
A first-hand incident report: changing the app display name in Tesla's developer portal dropped our partner registration, and the failure looked nothing like a naming problem — cars reported unpaired, commands failed with confusing errors.
What it actually takes to send a signed command to a Tesla
A from-the-implementation look at Tesla's Vehicle Command Protocol — the ECDH handshake, HMAC-SHA256 signing, and replay-protection counter that stand between an API call and your car's windows actually moving.
Cabin Overheat Protection vs. venting: the real trade-off Tesla doesn't spell out
Tesla's Cabin Overheat Protection runs the A/C while you're parked. Venting cracks the windows instead. Here's what each actually costs you in range and security, and when each one is the right call.
Why a parked Tesla turns into an oven — and why cracking the windows actually works
The greenhouse effect that heats a closed car cabin, why it happens faster in a Tesla's all-glass roof, and why venting a few inches of window beats almost everything else you can do about it.