To build with new config.h you need
$ make clean
When debug console of your device is not ready you will see like this:
Waiting for device:.........
once the device is pluged in then hid_listen finds it you will get this message:
Waiting for new device:.........................
Listening:
Check if you can't get this 'Listening:' message:
CONSOLE_ENABLE=yes in Makefile.Check:
debug_enable=yes usually in matrix_init() in matrix.c.