How to reverse direction from VESC UART?

Hi!

Can someone please explain how to spin motor reverse direction with VESCUART (SolidGeek) and NunchuckValues?
I can spin it forward but I don't understand how to spin it backwards.

Here is my Arduino example:

#include "VescUart.h"
VescUart VESCUART;

void setup() {

  Serial1.begin(115200);
  VESCUART.setSerialPort(&Serial1);

}

void loop() {

  VESCUART.nunchuck.valueY = 170;
  VESCUART.setNunchuckValues();
  delay(10000);

}

At the beginning I thought that 127 value is zero current and values below that are reverse. But it is not working like that.

I have catched raw hex value for reverse from VESC tool "02 05 05 FF FF D8 F0 D4 06 03" but it is to complex for me :)