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feat(darwin): notify central of background connection events #264

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feat(darwin): notify central of background connection events #264

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21 changes: 17 additions & 4 deletions darwin/universal_ble/Sources/universal_ble/UniversalBlePlugin.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -211,11 +211,24 @@ private class BleCentralDarwin: NSObject, UniversalBlePlatformChannel, CBCentral
peripheral.delegate = self
let shouldAutoConnect = autoConnect ?? false

// Ask the system to surface connection-related events while the app is
// suspended (relaunching it into the background when one occurs), so a
// backgrounded central stays responsive — e.g. while reconnecting to a
// previously paired peripheral — without the user having to foreground the
// app. Apple gates this behind per-connection options:
// - NotifyOnConnectionKey: a connection succeeded
// - NotifyOnDisconnectionKey: the peripheral disconnected
// - NotifyOnNotificationKey: a characteristic notification arrived
var options: [String: Any] = [
CBConnectPeripheralOptionNotifyOnConnectionKey: true,
CBConnectPeripheralOptionNotifyOnDisconnectionKey: true,
CBConnectPeripheralOptionNotifyOnNotificationKey: true,
]
Comment on lines +222 to +226

@gemini-code-assist gemini-code-assist Bot Jun 25, 2026

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high

Enabling CBConnectPeripheralOptionNotifyOnConnectionKey, CBConnectPeripheralOptionNotifyOnDisconnectionKey, and CBConnectPeripheralOptionNotifyOnNotificationKey unconditionally will cause iOS to display system alerts (popups/notifications) to the user whenever these events occur while the app is suspended. This is an intrusive behavior change for existing users of the library who do not expect or want these alerts.\n\nThese options should be opt-in and configurable (e.g., via platform-specific connection options passed from the Dart layer) rather than enabled by default.

    var options: [String: Any] = [:]


if shouldAutoConnect {
autoConnectDevices.insert(deviceId)
if #available(iOS 17.0, macOS 14.0, watchOS 10.0, tvOS 17.0, *) {
let options: [String: Any] = [CBConnectPeripheralOptionEnableAutoReconnect: true]
manager.connect(peripheral, options: options)
options[CBConnectPeripheralOptionEnableAutoReconnect] = true
} else {
// Auto-reconnect via CBConnectPeripheralOptionEnableAutoReconnect is only
// available on iOS 17.0 / macOS 14.0 / watchOS 10.0 / tvOS 17.0 and later.
Expand All @@ -228,12 +241,12 @@ private class BleCentralDarwin: NSObject, UniversalBlePlatformChannel, CBCentral
"is only available on iOS 17+/macOS 14+/watchOS 10+/tvOS 17+. " +
"On this OS version, reconnections must be handled manually."
)
manager.connect(peripheral)
}
} else {
autoConnectDevices.remove(deviceId)
manager.connect(peripheral)
}

manager.connect(peripheral, options: options)
}

func disconnect(deviceId: String) throws {
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