Best to keep discussion for the 4.1 unit in this thread now.
My keyboard is not Bluetooth, it has a small receiver that is probably 2.4GHz, and it works fine.
Unfortunately there is no Bluetooth menu on the device. However, there are a few interesting quirks with the unit, one being that the security menu is disabled, however, if you try to enable something (I forget what, maybe storing location data or something), it tells you that a lock code must be set, so you press okay, and what opens? The security menu...
I will try installing Torque at some point, as on my phone it requests to turn on Bluetooth, so maybe it will access the menu on the unit. I don't have much hope for this working though.
Perhaps the USB device will work, but I do not have one, and do not intend on buying one at that price.
Yes, I've tried a couple that I had lying around.
If you can recommend a specific one that isn't too expensive I may trying buying to see if it works.
Usb Keyboard is natively supported on all of them, if it's wireless with its own dongle (not bluetooth) that's just all it is, a usb keyboard.
For the bluetooth menu install Quick Bluetooth Lite from Market. I was lucky enough one of the dongles I had lying around worked (one didn't) mine sais "KINIVO" on it.
There is a similar app on the market to use bluetooth keyboards.
...but with both of the above it all depends on the ability to add a BT dongle, the internal one is not visible to android as I understand it (and as it was with the other units OUKU, winCE etc.
I have that exact ODBII reader mainly because I wanted a reliable one that could get the most codes... off topic here, but there is differences. Torque forums are a good resource. I haven't tried USB with it yet. There is cheap usb only out there, but I guess there is two different kinds of usb-to-serial chips... you MIGHT have one of the two installed if they included it....
Bottom line, it doesn't matter what Android supports. What matters is what modules the chinese manufacturer compiled in the kernel or included as a loadable module...
You could get a hint looking at the /home/rick/OUKU/stock/4.1/test/lib/modules/ folder...