There’s a variety of steps, classes, delegates, callback methods, and more involved in the flow of managing Bluetooth LE communication. But the core ideas are consistent and can be generalized. It needs to be understand how the process works, what to expect, and how to handle the unexpected. Your app will be involved in each step.
- [Announcer] Now let's look at some of the aspects…of Bluetooth Low Energy Communication.…Peripherals advertise in the broadcast sense…details about themselves that centrals can pick up on…as they're scanning.…When a central discovers a peripheral…that it's interested in,…it can request a connection.…Once that connection is made, it can request…to discover the services of that peripheral.…The details of the services are passed back to the central,…and it can determine which services it's interested in.…
For any interested services,…it can request the characteristics.…This is the place where the data is written to,…and read from, on the peripheral.…The process is not necessarily linear at the start.…A central can be scanning at any point,…and a peripheral can be advertising.…Once the central discovers the peripheral,…based on the advertised data,…it can request the connection.…When the connection is successful,…it can request to discover the services,…and the services data is returned from the peripheral…back to the central.…
Author
Bear Cahill
Released
4/5/2018- Bluetooth Low Energy (BLE) basics
- Core Bluetooth key classes
- Scanning for peripherals
- Discovering services and characteristics
- Writing to a characteristic
- Reconnecting to peripherals
- Apps as peripherals
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome1m 10s
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Exercise files33s
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1. BLE Basics
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BLE overview1m 29s
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BLE communication workflow1m 18s
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SensorTag overview1m 38s
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2. Scanning, Connecting, and Discovering
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Bluetooth project setup4m 30s
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Scan for peripherals4m 54s
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Connect to peripheral3m 13s
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3. Writing to a Characteristic
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Adding additional features10m 43s
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4. An App as a Peripheral
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Central app on Mac4m 19s
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Peripheral iOS app7m 47s
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Creating a characteristic2m 42s
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Central read requests4m 6s
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Central write requests4m 21s
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Conclusion
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Next steps1m 7s
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Video: BLE communication workflow