  When deploying a testbed infrastructure for Wireless Sensor Networks (WSNs),
one of the most challenging feature is to provide repeatable mobility. Wheeled
robots, usually employed for such tasks, strive to adapt to the wide range of
environments where WSNs are deployed, from chaotic office spaces to potato
fields in the farmland. For this reson, these robot systems often require
expensive customization steps that, for example, adapt their localization and
navigation system. To avoid these issues, in this paper we present the design
of Gondola, a parametric robot infrastructure based on pulling wires, rather
than wheels, that avoids the most common problems of wheeled robot and easily
adapts to many WSN's scenarios. Different from wheeled robots, wich movements
are constrained on a 2-dimensional plane, Gondola can easily move in
3-dimensional spaces with no need of a complex localization system and an
accuracy that is comparable with off-the-shelf wheeled robots.
