This app supports granular analysis of raw MetaWear sensor data. (For a simpler workflow for acquiring streamed or logged MetaWear sensor data, try the MetaBase app.)
For using, configuring, and connecting to MetaWears, try: Common/Presentation/ViewModels/Implementations/. These objects are written imperatively for UIKit/AppKit. For a sample use with SwiftUI views, these VMs call delegate ObservableObjects suffixed with SUIVC.
For C++ constants, try MetaWearEnumsSwiftBridges.swift.
You can learn more about working with pointers in Swift with these resources:
Apple Developer Forum Threads
Apple Documentation
WWDC Videos