You could always connect via Bluetooth and send the ESC codes direct through BT to print exactly what you want (depending on what you are trying to print), just check in the manual for the ESC codes and standard.
Thanks, our mPOS App works fine using the powerful small printer NT-5802LD
a video
sorry for the quality
but now we want to make the big printer work, we have just found that its configuration is star-graphic mode :-( trying to contact technical support to change the configuration to ESC/POS mode..