SWIFT - BLE通讯 [英] SWIFT - BLE communications
问题描述
我有一个SWIFT应用程序必须通过蓝牙LowEnergy模块向我的Arduino发送一个值！
I've got a SWIFT application that have to send a value to my Arduino with Bluetooth LowEnergy module!
我已经正确完成了搜索和连接部分但是我无法发送和接收任何数据。
I've done correctly the search and connection parts but I'm not able to send and receive any data.
这是我的代码，用于获取可用的BLE设备列表，然后将所有这些设置放在表格视图中，然后单击在应用程序提供的单元格中连接设备！
Here is my code to get a list of BLE devices available and put all this in a table view then after click in a cell the app provide to connect the device with them!
这一切都很完美，但我不知道从app发送一个a字符BLE并从arduino回复应用程序！
All this works perfectly but I don't know to send for example a "a" character from app to BLE and get back the answer from arduino to app!
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
}
推荐答案
以下代码适用于Swift 3（XCode 8 Beta 6）。这是一个使用标准UUID用于串行端口的示例，例如某些商业模块上的串行端口。因此，服务和特征的声明应如下所示：
The following code is for Swift 3 (XCode 8 Beta 6). It's an example using the standard UUIDs for serial ports like the ones on some commercial modules. So the declarations for the service and characteristics should look like this:
private let UuidSerialService = "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"
private let UuidTx = "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
private let UuidRx = "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"
然后你的委托给didDiscoverCharacteristic的方法可以是这样的：
And then your delegate's method for the didDiscoverCharacteristic can be something like this:
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，类似下面的工作，其中值为[UInt8]：
For writing to the Tx, something like the following works, where value is an [UInt8]:
let data = NSData(bytes: value, length: value.count)
serialPortPeripheral?.writeValue(data as Data, for: txCharacteristic, type: CBCharacteristicWriteType.withResponse)
阅读？
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，如果你不知道或者你不确定你的BLE设备的服务和特性，你可以寻找一个名为LightBlue的免费iOS应用程序。它会发现一个设备，如果你连接到它，它将列出所有服务和特征。请注意，当LightBlue连接到您的设备时，您的应用程序将无法访问BLE硬件。
Finally, if you don't know or you are not sure about the services and characteristics of your BLE device, you can look for a free iOS app called "LightBlue". It will discover a device and if you connect to it, it will list all services and characteristics. Just be aware that obvoiusly your app will not be able to access the BLE hardware while LightBlue is connected to your device.
这篇关于SWIFT - BLE通讯的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
