0
我有一個程序運行在Windows PC上，通過COM端口發送/接收數據。數據通過藍牙通過HM10藍牙模塊傳輸。寫數據到藍牙外設失敗
我能夠發現外圍設備，連接到它，發現它的服務和特性都成功。然而我的問題是發送數據。中央是我的iPhone。 PC作爲外設。
首先我的代碼。
import CoreBluetooth
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var peripheralNameLabel: UILabel!
@IBOutlet weak var noOfServicesLabel: UILabel!
@IBOutlet weak var sendBytesButton: UIButton!
@IBOutlet weak var sendStringButton: UIButton!
@IBOutlet weak var responseTextView: UITextView!
private let serviceUUID = CBUUID(string: "FFE0")
private var characteristicUUID = CBUUID(string: "FFE1")
private var manager: CBCentralManager!
private var peripheral: CBPeripheral!
private var characteristic: CBCharacteristic!
override func viewDidLoad() {
super.viewDidLoad()
manager = CBCentralManager(delegate: self, queue: nil)
}
@IBAction func didTapSendBytesButton(sender: UIButton) {
let bytes: [UInt8] = [0x35, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
let data = NSData(bytes: bytes, length: bytes.count)
peripheral.writeValue(data, forCharacteristic: characteristic, type: .WithResponse)
}
@IBAction func didTapSendStringButton(sender: UIButton) {
let string = "5100000000"
if let data = string.dataUsingEncoding(NSUTF8StringEncoding) {
peripheral.writeValue(data, forCharacteristic: characteristic, type: .WithResponse)
} else {
sendStringButton.enabled = false
sendStringButton.setTitle("", forState: .Normal)
}
}
}
extension ViewController: CBCentralManagerDelegate {
func centralManagerDidUpdateState(central: CBCentralManager) {
print(#function)
switch central.state {
case .Unsupported:
print("Unsupported")
case .Unauthorized:
print("Unauthorized")
case .PoweredOn:
print("Powered On")
navigationItem.title = "Connecting..."
central.scanForPeripheralsWithServices([serviceUUID], options: nil)
case .Resetting:
print("Resetting")
case .PoweredOff:
print("Powered Off")
case .Unknown:
print("Unknown")
}
}
func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {
print(#function)
print("Discovered \(peripheral.name) at \(RSSI)")
peripheralNameLabel.text = peripheral.name
if peripheral.name == nil || peripheral.name == "" {
return
}
if self.peripheral == nil || self.peripheral.state == .Disconnected {
self.peripheral = peripheral
central.connectPeripheral(peripheral, options: nil)
central.stopScan()
}
}
func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) {
print(#function)
navigationItem.title = "Connected!"
sendBytesButton.enabled = true
sendStringButton.enabled = true
peripheral.delegate = self
peripheral.discoverServices([serviceUUID])
}
func centralManager(central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: NSError?) {
self.peripheral = nil
central.scanForPeripheralsWithServices(nil, options: nil)
}
func centralManager(central: CBCentralManager, didFailToConnectPeripheral peripheral: CBPeripheral, error: NSError?) {
print(#function)
self.peripheral = nil
}
}
extension ViewController: CBPeripheralDelegate {
func peripheral(peripheral: CBPeripheral, didDiscoverServices error: NSError?) {
print(#function)
guard let services = peripheral.services else {
return
}
noOfServicesLabel.text = "\(services.count)"
for service in services {
print(service.UUID)
if service.UUID == serviceUUID {
peripheral.discoverCharacteristics(nil, forService: service)
}
}
}
func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError?) {
print(#function)
guard let characteristics = service.characteristics else {
return
}
for characteristic in characteristics {
print("characteristic: \(characteristic.UUID)")
if characteristic.UUID == characteristicUUID {
self.characteristic = characteristic
peripheral.setNotifyValue(true, forCharacteristic: characteristic)
}
}
}
func peripheral(peripheral: CBPeripheral, didWriteValueForCharacteristic characteristic: CBCharacteristic, error: NSError?) {
print(#function)
print(error)
}
func peripheral(peripheral: CBPeripheral, didUpdateValueForCharacteristic characteristic: CBCharacteristic, error: NSError?) {
print(#function)
if characteristic.UUID == characteristicUUID {
print("Got reply from: \(characteristic.UUID)")
if let data = characteristic.value, let string = String(data: data, encoding: NSUTF8StringEncoding) {
responseTextView.text = string
} else {
print("No response!")
}
}
}
}
我應該發送一個字節數組這樣，
0x35 0x31 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
到外圍，如果外圍成功接收到它，我得到這個作爲響應，
0x43 0x41 0x4E 0x20 0x31 0x31 0x2F 0x35 0x30 0x30 0x0D 0x0A。
它應該是什麼樣子。
這到底發生了什麼。
數據分組傳輸時被破碎成碎片。所以我沒有得到成功的迴應。
奇怪的部分有時很少它實際上起作用！數據得到正確發送（如第一張圖所示），我收到成功響應。但失敗的發生往往不是。像99％的時間。
我嘗試了兩種方式，將數據作爲字節數組發送（didTapSendBytesButton()）並將其作爲字符串轉換（didTapSendStringButton()）發送。兩者都是一樣的。
還使用名爲Bluetooth Serial的應用測試了它。同樣的結果。
我不明白爲什麼會發生這種情況。
您可以在這裏引用iOS和Windows--您使用哪種發送數據？你想和哪個外設通話？ – Carter
對不起，如果我不清楚。我會更新答案。 iOS設備充當中心。 PC作爲外設。 – Isuru
您使用藍牙串口應用程序進行了測試，並且具有相同的行爲，是不是表示問題出現在接收端？您接收數據的代碼是什麼？ – Carter