  We present the Databox application development environment or SDK as a means
of enabling trusted IoT app development at the network edge. The Databox
platform is a dedicated domestic platform that stores IoT, mobile and cloud
data and executes local data processing by third party apps to provide end-user
control over data flow and enable data minimisation. Key challenges for
building apps in edge environments concern i. the complexity of IoT devices and
user requirements, and ii. supporting privacy preserving features that meet new
data protection regulations. We show how the Databox SDK can ease the burden of
regulatory compliance and be used to sensitize developers to privacy related
issues in the very course of building apps. We present feedback on the SDK's
exposure to over 3000 people across a range of developer and industry events.
