This event uses the value data field, which will be the difference in rotation between the average angle of all current touch points compared to the average angle of all the previous touch points. The value will be in degrees.

Data

uint32_t    button
uint32_t    timestamp
int16_t     subtype
int16_t     x
int16_t     y
int16_t     z
int16_t     id
int16_t     spare
float       value
float       x_move
float       y_move
int16_t     npoints
                    

Where: