Stream vehicle telemetry via the Tesla Fleet API

Steps

1. Register a developer application at developer.tesla.com, complete business verification, and host the required EC public key (secp256r1 curve) at https://{appDomain}/.well-known/appspecific/com.tesla.3p.public-key.pem.
2. Obtain a partner token via the partner authentication endpoint, then call POST /api/1/partner_accounts to register your domain and link the public key.
3. Obtain a third-party user access token using the standard OAuth 2.0 authorization code flow to get consent from the vehicle owner with scopes that include vehicle_device_data.
4. Create a Fleet Telemetry configuration by sending a signed POST request through the vehicle-command proxy to /api/1/vehicles/{vin}/fleet_telemetry_config/create, specifying your server hostname, port, TLS certificate, and the fields you want streamed (e.g., Location, Odometer, BatteryLevel, VehicleSpeed).
5. Run your Fleet Telemetry server (open-source reference implementation at github.com/teslamotors/fleet-telemetry); it receives protobuf-encoded messages over a TLS-secured WebSocket from the vehicle approximately every 500 milliseconds.
6. To remove streaming, call DELETE /api/1/vehicles/{vin}/fleet_telemetry_config using a partner token.