Bluetooth

Lars Thorup explains a way to run fast, robust integration tests for React Native apps that communicate with Bluetooth devices. Instead of relying only on slow, fragile end-to-end tests or hand-written mocks that can drift from the real device protocol, the approach records real BLE traffic and replays it in Jest tests. A lightweight recorder app captures traffic on a phone with a physical device; developers then use those recordings to test app components on a computer in milliseconds. The talk also covers canonical device IDs and values, validating live device data, combining recordings with manual mocks, and making BLE recordings easier to read.

Eric Migicovsky traces Pebble’s path from a bicycle computer prototype in 2008 to a smartwatch shaped by customer feedback and a developer community. He describes how the team used early prototypes, press coverage, small production runs, and close customer relationships to validate the idea. After investors passed, Pebble raised $10 million from 70,000 people on Kickstarter by focusing on notifications, fitness, and customization. The talk emphasizes building iteratively, listening to users, and creating an open platform that gains value through its community.