At the moment, you cannot use zTrack in combination with TTN, because TTN generates an own DevAddr you have to use. At the moment you cannot change this DevAddr in zTrack. So you cannot use TTN allhere. Zoltan, CEO of Zane, told me today, he will change this in new firmware version, so DevAddr can be changed.
We must wait… will continue my documentation, if things evolve http://goo.gl/Uf6PQD