DU-Teššup's name refers to the Hurrian god of sky and storm, Teshub.
Aziru, and his father Abdi-Ashirta, were some of the major instigating forces (in the north) causing conflict with the Egyptian pharaoh, as cities ('city-states'), and regions were under constant threat and destruction in the northern, and western Canaan region (Lebanon, and southern Syria).
Aziru was called to Egypt to explain his actions: bad, and good.
Aziru wrote, as did his father Abdi-Ashirta, that he was protecting his regions.
All the letters from both Aziru and Abdi Ashirta reflect: "the middle conflict", allegiance to pharaoh to the south (northeast Egypt), control and protection (calling 'to guard') the local cities (and their rulers), in northern Canaan, and personal aspirations of total control, and their personal aggrandizement.