Just to avoid any confusion: Please note that this topic was for BitX40, not ubitx.
The file ubitx_cat.ino won't work on a BitX40.
Back to Praba's question:
The stock firmware v1.01 for BitX40 only provides basic LSB functionality.
So no cat control.
(v1.28 doesn't support cat control either, though)
73 Allard PE1NWL