Client of ASUS Download Master allows to manage Download Master USB application for ASUS routers. You can manage your torrent downloads and add new torrents: just download and open them on your Android device.
Confirmed compatibility with models RT-AC68U, RT-N66U, RT-AC66U, RT-N55U, RT-N56U, DSL-N55, RT-N50U, RT-N16, RT-N14 (list based on positive feedbacks in comments)
Open-source project. Codebase: http://code.google.com/p/asus-download-master-client/