# BLE

> **Implementation: experimental · Proposal: [in-review](https://github.com/napplet/naps/pull/62)** (status checked 2026-10-31). GATT binding has unit coverage; real-device behavior across host backends is not established by these tests. All capabilities remain subject to change. [Maturity and opt-in policy](https://napplet.run/docs/naps/maturity.md).

Runtime-mediated Bluetooth LE/GATT sessions. Napplets receive opaque session ids and byte arrays while the shell owns chooser UI, permissions, device handles, GATT lifecycle, notifications, disconnects, and policy.

```ts
if (window.napplet?.ble) {
  const { session } = await window.napplet.ble.open({ acceptAllDevices: true });
  const services = await window.napplet.ble.services(session.id);
}
```

This non-normative guide defers to the living [NAP-BLE proposal](https://github.com/napplet/naps/pull/62). Feature-gate with `if (window.napplet?.ble)` before use; the runtime injects only available domains. Typed helpers ship from [`@napplet/nap/ble`](https://napplet.run/docs/packages/nap.md) and [`@napplet/sdk`](https://napplet.run/docs/packages/sdk.md).