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Bluetooth (discovery, SPP/HFP/HID) for Mob apps (extracted from mob core)

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mob_bluetooth priv mob_plugin.exs
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priv/mob_plugin.exs

%{
name: :mob_bluetooth,
mob_version: "~> 0.6",
plugin_spec_version: 1,
description: "Bluetooth Classic (BR/EDR) — discovery, pairing, HFP + SPP profiles",
nifs: [
# Android: lang: :zig routes this through -Dplugin_zig_nifs + addZigObject.
# :module is the C/Erlang NIF name; the source's `mob_bluetooth_nif_nif_init`
# export is the static init symbol the generated driver table references.
# platform: :android so it isn't pulled into the iOS build.
%{module: :mob_bluetooth_nif, native_dir: "priv/native/jni", lang: :zig, platform: :android},
# iOS: the same NIF module name, but the ObjC CoreBluetooth implementation
# (ble_* — a BLE surface; iOS has no classic-BT API). platform: :ios so the
# Android build skips it. The two share the Erlang stub module
# (src/mob_bluetooth_nif.erl); each platform's NIF provides only its own
# functions and the Elixir layer gates calls per platform.
%{module: :mob_bluetooth_nif, native_dir: "priv/native/ios", lang: :objc, platform: :ios}
],
# Runtime permission capability — Android-only (BT Classic is unsupported on
# iOS, so no ios handler). The Android bridge's MobPermissionProvider maps
# :bluetooth_connect to the whole Nearby-devices group (SCAN/CONNECT/ADVERTISE);
# core's request_permission consults it so Mob.Permissions.request(socket,
# :bluetooth_connect) shows the runtime dialog and grants the group.
permissions: [
%{capability: :bluetooth_connect}
],
android: %{
permissions: [
"android.permission.BLUETOOTH_CONNECT",
"android.permission.BLUETOOTH_SCAN",
# make_discoverable fires ACTION_REQUEST_DISCOVERABLE, which needs
# BLUETOOTH_ADVERTISE on Android 12+.
"android.permission.BLUETOOTH_ADVERTISE",
# Discovery (startDiscovery) returns scan results only with location access.
"android.permission.ACCESS_FINE_LOCATION"
],
# Plain JNI-thunk C (Java_io_mob_bluetooth_*) compiled via
# -Dplugin_jni_sources alongside beam_jni.c — holds the 25 nativeDeliverBt*
# thunks that call the plugin NIF's mob_deliver_bt_* exports.
jni_source: "priv/native/jni/mob_bluetooth_jni.c",
# Plugin-owned Kotlin bridge class (own package, NOT the app's MobBridge).
# mob_dev copies it into the app Kotlin sourceSet and generates
# MobPluginBootstrap.registerAll() to call MobBluetoothBridge.register() at
# startup, which caches the jclass + bt_* method ids natively.
bridge_kt: "priv/native/android/MobBluetoothBridge.kt",
bridge_class: "io.mob.bluetooth.MobBluetoothBridge"
},
ios: %{
# CoreBluetooth for the ble_* surface (CBCentralManager scan +
# CBPeripheralManager advertise).
frameworks: ["CoreBluetooth"],
plist_keys: %{
NSBluetoothAlwaysUsageDescription:
"Bluetooth access is required to discover and advertise to nearby devices.",
# Background BLE: bluetooth-central keeps scanning/connecting alive,
# bluetooth-peripheral keeps advertising alive, when the app is
# backgrounded. Array-MERGED into the host Info.plist by mob_dev >= 0.6.16
# (so it composes with e.g. mob_background's `audio` entry). Background
# scanning additionally requires a :service_uuids filter on ble_scan/2.
# If Apple flags an unused mode at review, drop whichever of central/
# peripheral this app does not use.
UIBackgroundModes: ["bluetooth-central", "bluetooth-peripheral"]
}
}
}