Germany had agreed to associate itself with development of Kochi, Bhubaneswar and Coimbatore as smart cities through technical and financial assistance.
Adler, accompanied by a delegation of about 15 officials and CEOs of German firms, met Naidu at India House in Berlin.
"Both (sides) discussed the German Government's assistance to the three smart cities identified by them - Kochi, Bhubaneswar and Coimbatore," an official release said.
He met Vice President of German Parliament Ulla Schmidt and Chairman of Indo-German Parliamentary Group Ralph Brinkhaus, MPs and others.