mirror of
https://github.com/permissionlesstech/bitchat-android.git
synced 2026-07-25 10:45:21 +00:00
326 lines
12 KiB
Kotlin
326 lines
12 KiB
Kotlin
package com.bitchat.android.mesh
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import android.bluetooth.*
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import android.bluetooth.le.AdvertiseCallback
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import android.bluetooth.le.AdvertiseData
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import android.bluetooth.le.AdvertiseSettings
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import android.bluetooth.le.BluetoothLeAdvertiser
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import android.content.Context
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import android.os.ParcelUuid
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import android.util.Log
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import com.bitchat.android.protocol.BitchatPacket
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.delay
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import kotlinx.coroutines.launch
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import java.util.*
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/**
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* Manages GATT server operations, advertising, and server-side connections
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*/
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class BluetoothGattServerManager(
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private val context: Context,
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private val connectionScope: CoroutineScope,
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private val connectionTracker: BluetoothConnectionTracker,
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private val permissionManager: BluetoothPermissionManager,
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private val powerManager: PowerManager,
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private val delegate: BluetoothConnectionManagerDelegate?
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) {
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companion object {
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private const val TAG = "BluetoothGattServerManager"
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// Use exact same UUIDs as iOS version
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private val SERVICE_UUID = UUID.fromString("F47B5E2D-4A9E-4C5A-9B3F-8E1D2C3A4B5C")
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private val CHARACTERISTIC_UUID = UUID.fromString("A1B2C3D4-E5F6-4A5B-8C9D-0E1F2A3B4C5D")
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}
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// Core Bluetooth components
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private val bluetoothManager: BluetoothManager =
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context.getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
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private val bluetoothAdapter: BluetoothAdapter? = bluetoothManager.adapter
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private val bleAdvertiser: BluetoothLeAdvertiser? = bluetoothAdapter?.bluetoothLeAdvertiser
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// GATT server for peripheral mode
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private var gattServer: BluetoothGattServer? = null
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private var characteristic: BluetoothGattCharacteristic? = null
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private var advertiseCallback: AdvertiseCallback? = null
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// State management
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private var isActive = false
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/**
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* Start GATT server
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*/
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fun start(): Boolean {
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if (!permissionManager.hasBluetoothPermissions()) {
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Log.e(TAG, "Missing Bluetooth permissions")
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return false
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}
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if (bluetoothAdapter?.isEnabled != true) {
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Log.e(TAG, "Bluetooth is not enabled")
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return false
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}
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if (bleAdvertiser == null) {
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Log.e(TAG, "BLE advertiser not available")
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return false
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}
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isActive = true
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connectionScope.launch {
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setupGattServer()
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delay(300) // Brief delay to ensure GATT server is ready
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startAdvertising()
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}
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return true
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}
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/**
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* Stop GATT server
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*/
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fun stop() {
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isActive = false
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connectionScope.launch {
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stopAdvertising()
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// Close GATT server
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gattServer?.close()
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gattServer = null
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Log.i(TAG, "GATT server stopped")
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}
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}
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/**
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* Get GATT server instance
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*/
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fun getGattServer(): BluetoothGattServer? = gattServer
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/**
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* Get characteristic instance
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*/
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fun getCharacteristic(): BluetoothGattCharacteristic? = characteristic
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/**
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* Setup GATT server with proper sequencing
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*/
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@Suppress("DEPRECATION")
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private fun setupGattServer() {
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if (!permissionManager.hasBluetoothPermissions()) return
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val serverCallback = object : BluetoothGattServerCallback() {
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override fun onConnectionStateChange(device: BluetoothDevice, status: Int, newState: Int) {
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// Guard against callbacks after service shutdown
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if (!isActive) {
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Log.d(TAG, "Server: Ignoring connection state change after shutdown")
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return
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}
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when (newState) {
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BluetoothProfile.STATE_CONNECTED -> {
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Log.i(TAG, "Server: Device connected ${device.address}")
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// Get best available RSSI (scan RSSI for server connections)
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val rssi = connectionTracker.getBestRSSI(device.address) ?: Int.MIN_VALUE
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val deviceConn = BluetoothConnectionTracker.DeviceConnection(
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device = device,
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rssi = rssi,
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isClient = false
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)
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connectionTracker.addDeviceConnection(device.address, deviceConn)
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}
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BluetoothProfile.STATE_DISCONNECTED -> {
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Log.i(TAG, "Server: Device disconnected ${device.address}")
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connectionTracker.cleanupDeviceConnection(device.address)
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}
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}
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}
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override fun onServiceAdded(status: Int, service: BluetoothGattService) {
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// Guard against callbacks after service shutdown
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if (!isActive) {
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Log.d(TAG, "Server: Ignoring service added callback after shutdown")
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return
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}
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if (status == BluetoothGatt.GATT_SUCCESS) {
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Log.d(TAG, "Server: Service added successfully: ${service.uuid}")
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} else {
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Log.e(TAG, "Server: Failed to add service: ${service.uuid}, status: $status")
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}
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}
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override fun onCharacteristicWriteRequest(
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device: BluetoothDevice,
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requestId: Int,
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characteristic: BluetoothGattCharacteristic,
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preparedWrite: Boolean,
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responseNeeded: Boolean,
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offset: Int,
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value: ByteArray
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) {
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// Guard against callbacks after service shutdown
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if (!isActive) {
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Log.d(TAG, "Server: Ignoring characteristic write after shutdown")
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return
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}
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if (characteristic.uuid == CHARACTERISTIC_UUID) {
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Log.i(TAG, "Server: Received packet from ${device.address}, size: ${value.size} bytes")
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val packet = BitchatPacket.fromBinaryData(value)
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if (packet != null) {
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val peerID = String(packet.senderID).replace("\u0000", "")
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Log.d(TAG, "Server: Parsed packet type ${packet.type} from $peerID")
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delegate?.onPacketReceived(packet, peerID, device)
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} else {
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Log.w(TAG, "Server: Failed to parse packet from ${device.address}, size: ${value.size} bytes")
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Log.w(TAG, "Server: Packet data: ${value.joinToString(" ") { "%02x".format(it) }}")
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}
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if (responseNeeded) {
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gattServer?.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, 0, null)
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}
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}
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}
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override fun onDescriptorWriteRequest(
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device: BluetoothDevice,
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requestId: Int,
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descriptor: BluetoothGattDescriptor,
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preparedWrite: Boolean,
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responseNeeded: Boolean,
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offset: Int,
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value: ByteArray
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) {
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// Guard against callbacks after service shutdown
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if (!isActive) {
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Log.d(TAG, "Server: Ignoring descriptor write after shutdown")
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return
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}
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if (BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE.contentEquals(value)) {
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Log.d(TAG, "Device ${device.address} subscribed to notifications")
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connectionTracker.addSubscribedDevice(device)
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connectionScope.launch {
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delay(100)
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if (isActive) { // Check if still active
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delegate?.onDeviceConnected(device)
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}
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}
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}
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if (responseNeeded) {
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gattServer?.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, 0, null)
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}
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}
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}
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// Proper cleanup sequencing to prevent race conditions
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gattServer?.let { server ->
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Log.d(TAG, "Cleaning up existing GATT server")
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try {
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server.close()
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} catch (e: Exception) {
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Log.w(TAG, "Error closing existing GATT server: ${e.message}")
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}
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}
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// Small delay to ensure cleanup is complete
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Thread.sleep(100)
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if (!isActive) {
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Log.d(TAG, "Service inactive, skipping GATT server creation")
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return
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}
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// Create new server
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gattServer = bluetoothManager.openGattServer(context, serverCallback)
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// Create characteristic with notification support
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characteristic = BluetoothGattCharacteristic(
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CHARACTERISTIC_UUID,
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BluetoothGattCharacteristic.PROPERTY_READ or
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BluetoothGattCharacteristic.PROPERTY_WRITE or
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BluetoothGattCharacteristic.PROPERTY_WRITE_NO_RESPONSE or
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BluetoothGattCharacteristic.PROPERTY_NOTIFY,
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BluetoothGattCharacteristic.PERMISSION_READ or
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BluetoothGattCharacteristic.PERMISSION_WRITE
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)
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val descriptor = BluetoothGattDescriptor(
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UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"),
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BluetoothGattDescriptor.PERMISSION_READ or BluetoothGattDescriptor.PERMISSION_WRITE
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)
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characteristic?.addDescriptor(descriptor)
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val service = BluetoothGattService(SERVICE_UUID, BluetoothGattService.SERVICE_TYPE_PRIMARY)
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service.addCharacteristic(characteristic)
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gattServer?.addService(service)
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Log.i(TAG, "GATT server setup complete")
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}
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/**
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* Start advertising
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*/
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@Suppress("DEPRECATION")
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private fun startAdvertising() {
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if (!permissionManager.hasBluetoothPermissions() || bleAdvertiser == null || !isActive) return
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val settings = powerManager.getAdvertiseSettings()
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val data = AdvertiseData.Builder()
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.addServiceUuid(ParcelUuid(SERVICE_UUID))
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.setIncludeTxPowerLevel(false)
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.setIncludeDeviceName(false)
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.build()
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advertiseCallback = object : AdvertiseCallback() {
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override fun onStartSuccess(settingsInEffect: AdvertiseSettings) {
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Log.i(TAG, "Advertising started (power mode: ${powerManager.getPowerInfo().split("Current Mode: ")[1].split("\n")[0]})")
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}
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override fun onStartFailure(errorCode: Int) {
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Log.e(TAG, "Advertising failed: $errorCode")
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}
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}
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try {
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bleAdvertiser.startAdvertising(settings, data, advertiseCallback)
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} catch (e: Exception) {
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Log.e(TAG, "Exception starting advertising: ${e.message}")
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}
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}
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/**
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* Stop advertising
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*/
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@Suppress("DEPRECATION")
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private fun stopAdvertising() {
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if (!permissionManager.hasBluetoothPermissions() || bleAdvertiser == null) return
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try {
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advertiseCallback?.let { bleAdvertiser.stopAdvertising(it) }
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} catch (e: Exception) {
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Log.w(TAG, "Error stopping advertising: ${e.message}")
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}
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}
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/**
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* Restart advertising (for power mode changes)
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*/
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fun restartAdvertising() {
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if (!isActive) return
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connectionScope.launch {
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stopAdvertising()
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delay(100)
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startAdvertising()
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}
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}
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} |