USB HOST KB you can connect usb or wireless keyboard and interface with any micro controller like ESP32.
2 MODES of operation. Default is 1 BYTE mode where the ASCII Character typed in retuns single byte of HEX data. For e.g 
A returns 0x41 
1 reurns 0x31
Enter Carriage return  0x0D
CM 0<CR>  is the command to set 1 B mode
Another mode is 2Byte mode where the character hex is prefixed with 0x00.
CM 1<CR> is the command to set this mode.
DEFAULT mode is 1B.