CAT 3208 monitoring

[davidbrady]

(03-04-2013 22:27)Ray Davis Wrote:  It's a possibility, but not a slam dunk. The CANpod device is essentially what I would call J1587 over IP (it converts the binary into ascii, and sends ascii data). However, it runs in the default world in ad-hoc mode. I assume in your mixed environment you would connect a hard-line IP into a wireless system? This means a couple of things, to monitor both:

1. CANpod would have to be configured to run in an existing wireless system, do-able, but not trivial.

2. The app would have to multiplex between two IP streams. Currently it doesn't use UDP, but connects into a specific port and IP, and then sets the CANpod into a streaming mode (except when reading error codes). Once streaming the app reads the data as fast as it's coming. Some work would be need to be done to work with a separate UDP stream.

Hey Ray,

That's interesting, thanks. So CANpod only implements the ad-hoc mode? I could do the same.

Probably the cheapest and most proven approach, at least in the Arduino world, would be to equip each Arduino with an ethernet shield and wire them all to a single wireless bridge/hub and transmit J1587 over UDP/IP (or whatever CANpod uses). The wireless bridge could be set to function in ad-hoc mode.

Assuming each wireless device ( the CANpod, bridge, and iPod) implements the usual collision avoidance (CSMA/CA), you'll see a single data stream and you may not need to tell CANpod packets from Arduino packets - no de-multiplexing required on your end, everything on the same port number. Would that work?