In some cases, you may want to write a value to a Bluetooth LE device’s characteristic as opposed to or in addition to reading its value. Core Bluetooth allows us to write to a peripheral’s specific characteristic using an instance of the Data class. Depending on the method used, there may also be a callback to notify of success or failure.
- [Instructor] So, now that we've connected to a peripheral…and discovered it's services and drilled down…into its characteristics, now we're going to look at…writing a value to a characteristic on the peripheral.…There's different types of characteristics…you may need to write to for your given device.…Sometimes it's to store data.…Other times it's to enable something or disable something…or otherwise configure the device.…To write to a peripheral, we're going to send…a data instance that represents whatever data…we're trying to store on the peripheral.…
That could be bytes or string.…It depends on the device and the characteristic in question.…Also, when you write data to a peripheral,…there's two options.…You can write with or without a response.…You have to check the properties for which one they support,…and use the appropriate parameter in the call.…We'll go over both cases.…So, in our code, we've discovered our service,…and then when we found the light detection sensor,…we discovered the characteristics.…
Author
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
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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: Write to a characteristic