SWIFT – BLE通信

我有一个SWIFT应用程序，需要通过Bluetooth LowEnergy模块向我的Arduino发送一个值！

我做了正确的search和连接部分，但我无法发送和接收任何数据。

这里是我的代码来获得可用的BLE设备的列表，并把所有这些放在一个表格视图中，然后单击应用程序提供的单元格以将它们连接到它们！

所有这一切都完美的作品，但我不知道从应用程序发送一个“a”字符到BLE，并从arduino回到应用程序的答案！

import UIKit import CoreBluetooth class BluetoothList: UITableViewController,CBCentralManagerDelegate, CBPeripheralDelegate { var listValue = [Lista]() var Blue: CBCentralManager! var conn: CBPeripheral! var a: String! var char: CBCharacteristic! func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) { if (peripheral.name == a){ self.conn = peripheral self.conn.delegate = self Blue.stopScan() Blue.connectPeripheral(self.conn, options: nil) self.performSegueWithIdentifier("ConnectionSegue", sender: nil) } else{ listValue = [ Lista(Name: peripheral.name!, RSS: RSSI.stringValue) ] self.tableView.reloadData() } } func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) { peripheral.delegate = self peripheral.discoverServices(nil) } func peripheral(peripheral: CBPeripheral, didDiscoverServices error: NSError?) { if let servicePeripheral = peripheral.services! as [CBService]!{ for service in servicePeripheral{ peripheral.discoverCharacteristics(nil, forService: service) } } } func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError?) { if let characterArray = service.characteristics! as [CBCharacteristic]!{ for cc in characterArray { if(cc.UUID.UUIDString == "FF05"){ print("OKOK") peripheral.readValueForCharacteristic(cc) } } } } func peripheral(peripheral: CBPeripheral, didUpdateValueForCharacteristic characteristic: CBCharacteristic, error: NSError?) { if (characteristic.UUID.UUIDString == "FF05"){ let value = UnsafePointer<Int>((characteristic.value?.bytes.memory)!) print("\(value)") } } func centralManagerDidUpdateState(central: CBCentralManager){ switch(central.state){ case .PoweredOn: Blue.scanForPeripheralsWithServices(nil, options:nil) print("Bluetooth is powered ON") case .PoweredOff: print("Bluetooth is powered OFF") case .Resetting: print("Bluetooth is resetting") case .Unauthorized: print("Bluetooth is unauthorized") case .Unknown: print("Bluetooth is unknown") case .Unsupported: print("Bluetooth is not supported") } } override func viewDidLoad() { super.viewDidLoad() Blue = CBCentralManager(delegate: self, queue: nil) } override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) { let currentCell = tableView.cellForRowAtIndexPath(tableView.indexPathForSelectedRow!)! as UITableViewCell a = currentCell.textLabel?.text Blue = CBCentralManager(delegate: self, queue: nil) } override func numberOfSectionsInTableView(tableView: UITableView) -> Int { return 1 } @IBAction func Reload_BTN(sender: AnyObject) { self.tableView.reloadData() } override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return self.listValue.count } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() } override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { let cella = self.tableView.dequeueReusableCellWithIdentifier("Cella", forIndexPath: indexPath) let Lista = self.listValue[indexPath.row] cella.textLabel?.text = Lista.Name cella.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator return cella } 

Answer 1

以下代码适用于Swift 3（XCode 8 Beta 6）。 这是一个使用串行端口的标准UUID的例子，就像一些商用模块上的那样。 所以服务和特性的声明应该是这样的：

 private let UuidSerialService = "6E400001-B5A3-F393-E0A9-E50E24DCCA9E" private let UuidTx = "6E400002-B5A3-F393-E0A9-E50E24DCCA9E" private let UuidRx = "6E400003-B5A3-F393-E0A9-E50E24DCCA9E" 

然后你的委托的didDiscoverCharacteristic的方法可以是这样的：

 public func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) { if let characteristics = service.characteristics { for characteristic in characteristics { // Tx: if characteristic.uuid == CBUUID(string: UuidTx) { print("Tx char found: \(characteristic.uuid)") txCharacteristic = characteristic } // Rx: if characteristic.uuid == CBUUID(string: UuidRx) { rxCharacteristic = characteristic if let rxCharacteristic = rxCharacteristic { print("Rx char found: \(characteristic.uuid)") serialPortPeripheral?.setNotifyValue(true, for: rxCharacteristic) } } } } } 

对于写入Tx，类似于以下的作品，其中值是[UInt8]：

 let data = NSData(bytes: value, length: value.count) serialPortPeripheral?.writeValue(data as Data, for: txCharacteristic, type: CBCharacteristicWriteType.withResponse) 

读？

 public func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) { let rxData = characteristic.value if let rxData = rxData { let numberOfBytes = rxData.count var rxByteArray = [UInt8](repeating: 0, count: numberOfBytes) (rxData as NSData).getBytes(&rxByteArray, length: numberOfBytes) print(rxByteArray) } } 

最后，如果您不知道或者您对BLE设备的服务和特性不甚了解，则可以查找名为“LightBlue”的免费iOS应用程序。 它会发现一个设备，如果你连接到它，它会列出所有的服务和特点。 请注意，LightBlue连接到您的设备时，obvoiusly您的应用程序将无法访问BLE硬件。