I need to do some tweaking to the Nova hardware. I obtained the gerbers and produced a couple of prototypes which are intended to be exact duplicates of the Nova. Once the exact duplicates work, I’ll begin the tweaking. So, now I have, in hand, a working Nova and and a Prototype (copy).
When I plug the Proto into a USB port on a Linux machine and load the drivers I do see the Proto as I would expect (/dev/ttyUSB0, /dev/ttyUSB2, /dev/ttyUSB3)
After configuring the appropriate GPIO pin I see the blue LED light when the Proto gets power.
Using the Linux utility ‘screen,’ I can open /dev/ttyUSB2 and send AT commands and view the responses.
Many commands work correctly, like these:
ATZ;Q0;E1 AT+UMNOPROF? AT+UMNOPROF=3 AT+GSN AT+CCID AT+COPS? AT+COPS=2 AT+CREG?
However, these commands,
AT+URAT? AT+URAT=7 AT+URAT=?
+CME ERROR: Operation not supported
Any thoughts on what could be wrong will be greatly appreciated.