Ble:将广告数据从Android发送到iOS [英] Ble: Send advertise data to iOS from Android
问题描述
我必须通过ble将一些广告数据发送到iOS中央应用程序.在Android外围设备方面，当我创建广告时，我会这样做:
I have to send some advertise data via ble to an iOS central app. On Android peripheral side, when i create advertise i do:
var byteArrayData = dataToSend.toByteArray(Charsets.UTF_8)
var data = AdvertiseData.Builder().apply {
addServiceData(
ParcelUuid(MY_SERVICE_UUID),
byteArrayData
)
}
bleAdvertiser.startAdvertising(mySettings.build(), data.build(), myAdvertiseCallback)
，但似乎iOS无法读取自定义服务数据.
but it seems that iOS is not able to read custom service data.
因此，有一种方法可以通过BLE向iOS发送一些小数据(少量字节)(并在Android为中心而iOS为外围设备时也接收数据)?
So, there's a way to sent some small data (few bytes) via BLE to iOS (and receive also data when Android is central and iOS is pheripheral)?
如果可能的话，我会避免在中央外围设备之间建立连接.
I would avoid, if is possible, to open a connection between central an peripheral.
推荐答案
iOS对广告数据的限制非常严格.无论是发送还是接收它，您都只能控制它的一小部分.它的大部分由iOS本身控制，并且在中央管理者的情况下，甚至都不会转发到该应用.
iOS is very restrictive regarding advertisement data. Both when sending and receiving it, you can only control a small subset of it. Most of it is controlled by iOS itself and — in case of the central manager role — not even forwarded to the app.
广告数据检索键是例外，适用于< centralManager(_:didDiscover:advertisementData:rssi的em> advertisementData 参数:) .
The exceptions are the Advertisement Data Retrieval Keys, applicable for the advertisementData parameter of centralManager(_:didDiscover:advertisementData:rssi:).
此答案中提到了一个更具体的示例.
A more specific example is mentioned in this answer.
更新
即使其中之一是用于服务数据，我也不认为数据会转发到应用程序.但是我可能是错的.我想您是在问这个问题，因为未设置键CBAdvertisementDataServiceDataKey.
Even though one of the keys is for service data, I don't think the data is forwarded to the app. But I might be wrong. I guess you are asking this question because the key CBAdvertisementDataServiceDataKey is not set.
更新2
我创建了一个最小的Android和iOS示例，并使它可以正常工作.我认为您的Android代码中没有明显的问题.因此，您需要与您的iOS同事交谈...
I've created a minimal Android and iOS example and got it working without any problem. I don't see no obvious problem in your Android code. So you will need to talk to your iOS colleague...
服务数据为"ABC"(或十六进制的61 62 63)，而16位UUID为FF01. iOS日志输出为:
The service data is "ABC" (or 61 62 63 in hex) and the 16-bit UUID is FF01. The iOS log output is:
2019-09-05 16:39:18.987142+0200 BleScanner[18568:3982403] [Scanner] Advertisement data: FF01: <616263>
Android-MainActivity.kt
package bleadvertiser
import android.bluetooth.BluetoothManager
import android.content.Context
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
class MainActivity : AppCompatActivity() {
private var peripheral: Peripheral? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
override fun onStart() {
super.onStart()
val bluetoothManager = getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
peripheral = Peripheral(bluetoothManager.adapter)
peripheral?.startAdvertising()
}
}
Android-Peripheral.kt
package bleadvertiser
import android.bluetooth.BluetoothAdapter
import android.bluetooth.le.AdvertiseCallback
import android.bluetooth.le.AdvertiseData
import android.bluetooth.le.AdvertiseSettings
import android.os.ParcelUuid
import android.util.Log
import java.util.*
private const val TAG = "Peripheral"
class Peripheral(private val bluetoothAdapter: BluetoothAdapter) {
fun startAdvertising() {
val advertiseSettings = AdvertiseSettings.Builder().build()
val serviceData = "abc".toByteArray(Charsets.UTF_8)
val advertiseData = AdvertiseData.Builder()
.addServiceData(ParcelUuid(SERVICE_UUID), serviceData)
.build()
val advertiser = bluetoothAdapter.bluetoothLeAdvertiser
advertiser.startAdvertising(advertiseSettings, advertiseData, advertiseCallback)
}
private val advertiseCallback = object: AdvertiseCallback() {
override fun onStartFailure(errorCode: Int) {
Log.w(TAG, String.format("Advertisement failure (code %d)", errorCode))
}
override fun onStartSuccess(settingsInEffect: AdvertiseSettings?) {
Log.i(TAG, "Advertisement started")
}
}
companion object {
val SERVICE_UUID: UUID = UUID.fromString("0000ff01-0000-1000-8000-00805F9B34FB")
}
}
iOS-ViewController.swift
import UIKit
class ViewController: UIViewController {
var bleScanner: BleScanner?
override func viewDidLoad() {
super.viewDidLoad()
bleScanner = BleScanner()
}
}
iOS-BleScanner.swift
import Foundation
import CoreBluetooth
import os.log
class BleScanner : NSObject {
static let serviceUUID = CBUUID(string: "FF01")
static let log = OSLog(subsystem: Bundle.main.bundleIdentifier!, category: "Scanner")
private var centralManager: CBCentralManager!
private var scanningTimer: Timer?
override init() {
super.init()
centralManager = CBCentralManager(delegate: self, queue: nil)
}
func startScanning() {
scanningTimer = Timer.scheduledTimer(withTimeInterval: TimeInterval(20), repeats: false, block: { (_) in
self.stopScanning()
})
centralManager.scanForPeripherals(withServices: [ BleScanner.serviceUUID ], options: nil)
}
func stopScanning() {
centralManager.stopScan()
}
}
extension BleScanner : CBCentralManagerDelegate {
func centralManagerDidUpdateState(_ central: CBCentralManager) {
if centralManager.state == .poweredOn {
startScanning()
}
}
func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
for (key, value) in advertisementData {
if key == CBAdvertisementDataServiceDataKey {
let serviceData = value as! [CBUUID : NSData]
for (uuid, data) in serviceData {
os_log("Advertisement data: %{public}s: %{public}s", log: BleScanner.log, type: .info, uuid.uuidString, data.debugDescription)
}
}
}
}
}
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