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Bluetooth Generic Attribute Profile (GATT) for Swift

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# GATT

[![Swift][swift-badge]][swift-url]
[![Platform][platform-badge]][platform-url]
[![Release][release-badge]][release-url]
[![License][mit-badge]][mit-url]

Bluetooth Generic Attribute Profile (GATT) for Swift

## Installation

GATT is available as a Swift Package Manager package. To use it, add the following dependency in your `Package.swift`:

```swift
.package(url: "https://github.com/PureSwift/GATT.git", branch: "master"),
```

and to your target, add `GATT` to your dependencies. You can then `import GATT` to get access to GATT functionality.

### Package Traits

GATT requires **Swift 6.2** and uses [package traits](https://github.com/swiftlang/swift-evolution/blob/main/proposals/0450-swiftpm-package-traits.md) to gate the pure Swift GATT stack:

| Trait | Default | Description |
| ---- | ---- | ---- |
| `BluetoothGATT` | Disabled | Imports the `BluetoothGATT` module, enabling the pure Swift GATT server (`GATTPeripheral`, `PeripheralManager`) and making the central use the `BluetoothGATT` types (`GATTCharacteristicProperties`, `ATTAttributePermissions`, `ATTMaximumTransmissionUnit`) instead of the lightweight shims. |

By default the `BluetoothGATT` trait is disabled, so GATT builds against the lightweight shim types. This suits central-only clients built on a platform Bluetooth stack (for example CoreBluetooth on iOS or the Android Bluetooth API), where the platform provides the GATT server and the shims keep the dependency footprint small.

Enable the trait when you need a GATT server (peripheral). This applies to both the pure Swift `GATTPeripheral` and the CoreBluetooth-backed `DarwinPeripheral`; the shim build provides the central role only. On platforms without threading (Embedded Swift targets like Pi Pico W, ESP32 or nRF52840 running BTStack, NimBLE or Zephyr), `GATTPeripheral` is driven by calling its non-blocking `run()` method from the platform's run loop instead of background threads.

```swift
.package(
    url: "https://github.com/PureSwift/GATT.git",
    branch: "master",
    traits: ["BluetoothGATT"]
),
```

## Platforms

| Platform | Roles | Backend | Library |
| ---- | -------- | --- | ----------- | 
| macOS, iOS, watchOS, tvOS, visionOS | Central, Peripheral | [CoreBluetooth](https://developer.apple.com/documentation/corebluetooth) | [DarwinGATT](https://github.com/PureSwift/GATT) |
| Linux | Central, Peripheral | [BlueZ](https://www.bluez.org) | [BluetoothLinux](https://github.com/PureSwift/BluetoothLinux), [GATT](https://github.com/PureSwift/GATT)
| Android | Central | [Java Native Interface](https://developer.android.com/training/articles/perf-jni) | [AndroidBluetooth](https://github.com/PureSwift/AndroidBluetooth)
| WebAssembly | Central | [Bluetooth Web API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Bluetooth_API) | [BluetoothWeb](https://github.com/PureSwift/BluetoothWeb)
| Pi Pico W | Peripheral | [BlueKitchen BTStack](https://bluekitchen-gmbh.com/btstack/#quick_start/index.html) | [BTStack](https://github.com/MillerTechnologyPeru/BTStack)
| ESP32 | Peripheral | [Apache NimBLE](https://mynewt.apache.org/latest/network/index.html) | [NimBLE](https://github.com/MillerTechnologyPeru/NimBLE)
| nRF52840 | Peripheral | [Zephyr SDK](https://zephyrproject.org) | [Zephyr](https://github.com/MillerTechnologyPeru/Zephyr-Swift)

## Usage

### Peripheral

```swift
import Bluetooth
#if canImport(Darwin)
import DarwinGATT
#elseif os(Linux)
import BluetoothLinux
#endif

#if os(Linux)
typealias LinuxPeripheral = GATTPeripheral<BluetoothLinux.HostController, BluetoothLinux.L2CAPSocket>
guard let hostController = await HostController.default else {
    fatalError("No Bluetooth hardware connected")
}
let serverOptions = GATTPeripheralOptions(
    maximumTransmissionUnit: .max,
    maximumPreparedWrites: 1000
)
let peripheral = LinuxPeripheral(
    hostController: hostController,
    options: serverOptions,
    socket: BluetoothLinux.L2CAPSocket.self
)
#elseif canImport(Darwin)
let peripheral = DarwinPeripheral()
#else
#error("Unsupported platform")
#endif

// start advertising
try await peripheral.start()

```

### Central

```swift
import Bluetooth
#if canImport(Darwin)
import DarwinGATT
#elseif os(Linux)
import BluetoothLinux
#endif

#if os(Linux)
typealias LinuxCentral = GATTCentral<BluetoothLinux.HostController, BluetoothLinux.L2CAPSocket>
let hostController = await HostController.default
let central = LinuxCentral(
    hostController: hostController,
    socket: BluetoothLinux.L2CAPSocket.self
)
#elseif canImport(Darwin)
let central = DarwinCentral()
#else
#error("Unsupported platform")
#endif

// start scanning
let stream = try await central.scan(filterDuplicates: true)
for try await scanData in stream {
    print(scanData)
    stream.stop()
}

```

## Documentation

Read the documentation [here](http://pureswift.github.io/GATT/documentation/gatt/).
Documentation can be generated with [DocC](https://github.com/apple/swift-docc).

License
-------

**GATT** is released under the MIT license. See LICENSE for details.

[swift-badge]: https://img.shields.io/badge/swift-6.2-F05138.svg "Swift 6.2"
[swift-url]: https://swift.org
[platform-badge]: https://img.shields.io/badge/platform-macOS%20%7C%20iOS%20%7C%20watchOS%20%7C%20tvOS%20%7C%20Linux%20%7C%20Android-lightgrey.svg
[platform-url]: https://swift.org
[mit-badge]: https://img.shields.io/badge/License-MIT-blue.svg?style=flat
[mit-url]: https://tldrlegal.com/license/mit-license
[build-status-badge]: https://github.com/PureSwift/GATT/workflows/Swift/badge.svg
[build-status-url]: https://github.com/PureSwift/GATT/actions
[release-badge]: https://img.shields.io/github/release/PureSwift/GATT.svg
[release-url]: https://github.com/PureSwift/GATT/releases
[docs-url]: http://pureswift.github.io/GATT/documentation/GATT/

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