Implementing a Bluetooth to CAN Bridge in a Telematics Unit
This paper uses the automotive diagnostic systems as an example of wireless technology enhancing diagnostic systems, in which Bluetooth serves as the underlying transport (physical) medium for an HTTP to CAN gateway. With the help of an embedded HTTP server on the vehicle’s gateway device, a mechanic can conveniently access, eavesdrop, and control nodes on the INV from a browser running on the mechanic’s Bluetooth-enabled laptop computer. Because the interface is wireless, the mechanic can access the network equally well from beneath the vehicle, under the hood, or inside the passenger compartment. The system described in this paper uses Bluetooth’s. Dialup Networking (DUN) profile to emulate an external modem, allowing the browser to “dial” into the vehicle’s CAN network. By using standard communication protocols such as HTTP and embedding the vehicle-specific diagnostic software in the TCU, the mechanic’s equipment would be completely scaleable across vehicle designs, even if the diagnostic and repair procedures were radically different between manufacturers, models, and model years.
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