Hello.
I own an old ELM327 Chinesse OBD scanner connected to my 2009 Nissan Qashqai J10 1.5dci. I can read basic parameters using RealDash (speed, rpm, battery voltage, …), and I wonder if I could get more information using the Meatpi device (open doors, lights, blinkers, alarms, …), as far as I have read that the CAN exposed in the OBD connector is for diagnostic purposes only, may not the same as the one used for the rest of the car, and may have a gateway, so that I will have to connect behind the gateway to get the raw traffic.
Can devices such as the Meatpi get all the information from the CAN bus lines of the OBD connector regardless of the gateway?
Is it worth investing in a Meatpi WiCAN-ESP32 or similar device?
Any of the supported CAN adapters other than ELM327 will give a better data rate. ELM327 is just not designed for reading CAN streams.
Especially if you need to send CAN frames from RealDash to your vehicle. With ELM327 you need to stop the stream of CAN frames, set some headers, send the CAN frame and restore the stream. That will cause noticeable delay on data every time you send a frame.
Supported CAN adapters:
RealDash | Manuals | Supported CAN/LIN Adapters
I have found the following information for Nissan Qashqai J10 at Github: Nissan Qashqai, unlike many other cars, only has one major CAN bus with between 6 and 12 devices connected to it (depending on model configuration) and it’s the same bus you can access through the Data Link Connector (connector M4 in the service manual schematics) or the comfort unit. The service manuals refer to that bus as “CAN communication” or “CAN COMM”. There is one other isolated bus using the CAN protocol and it connects the Audio unit to the NAVI unit who is the master device on that bus. That bus is referred to as “AV communication” or “AV COMM” in the service manuals… Both busses run at 500kbps with 11-bit addresses.
As the major CAN bus is the same bus you can access through DLC, I guess I will have full access to all the available information from the CAN bus lines exposed in the OBD connector using any of the RD supported adapters connected to the OBD connector: Do you think I am right?
I have not found information about the existance of a gateway behind the OBD connector in my car: If exists, can RD skip it?
I believe that you can use the CAN L & CAN H pins from your OBD2 connector.
We are currently working on Nissan Qashqai and X-Trail CAN file on this discussion: