Pebble iOS SDK by Pebble interacts with the API to create applications in wearable watches. Resources on GitHub include CocoaPods installation and Xcode documentation. Integration occurs via Bluetooth. See the examples available at https://github.com/pebble/pebble-sdk-examples
When creating an IoT prototype, an easy way to start is to pick a computing module that serves as your prototype core. This article explains why the Intel Edison IoT devkit is a good choice for developing IoT prototypes and will also suggest some best practices to follow when developing for it.