By Miguel Acosta Del Vecchio

Portfolio Website: https://miguelacostadelvecchio.github.io/MiguelAcostaPortfolio/

Linkedin: https://www.linkedin.com/in/miguel-acosta7

Youtube: https://www.youtube.com/@miguelacosta808

Instagram: https://www.instagram.com/miguelacostadel

Demonstration

https://www.youtube.com/watch?v=K2aWxgQEayY

General Information

• Resources

The objective of this article is to create an iOS app in which the user has the ability to scan for Bluetooth peripherals, connect/disconnect to those devices, and if the device is a Raspberry Pi 4 then the user can choose to toggle any of the togglable GPIO pins.

What even is a Bluetooth device?

• A Bluetooth device can be either a central or peripheral:
  • Central: the object that receives data from a Bluetooth device → iPhone
  • Peripheral: the Bluetooth device that publishes data to be consumed by other devices → Raspberry Pi or Whoop
• If you can connect to it via BLE (Bluetooth Low Energy) wireless technology, the Core Bluetooth framework can connect to it.

Advertising Packets

• Bluetooth peripherals broadcast some of the data they have in the form of advertising packets
  • These packets can contain information such as the peripheral’s name, main functionality, and extra information such as what kind of data the peripheral can provide.
• The job of the central is to scan for these advertising packets, identify any peripherals it finds relevant, and connect to individual devices for more information.

Services & Characteristics

• Advertising packets are very small and cannot contain a great deal of information. To share more data, a central needs to connect to a peripheral.