Hi @erko94, thanks for the clarification. You might already know that the long term storage of gaze data is prohibited by the SDK licence agreement as supplied with the EyeX although the gathering of fixation data might not necessarily be in violation of the agreement in you case, however have you looked at the fixation information as exposed in the Tobii EyeX SDK? Perhaps this is enough for your needs?
In any event, the calculation of fixations is something handled at the lower level of the API and not generally something we release publicly. Please check out the existing fixation stream and let us know how it suits.