我对Bluetooth LE相当陌生，并且在读写设备时遇到一些困难。
我一直在跟踪Monkey.Robotics项目，以指导我前进。现在，我到达了保存我需要的特性及其对应的描述符（用于读取和写入）的部分。我尝试实现要编写的功能，但没有成功。
我一直在尝试使用这种方法执行写入：
connectedPeripheral.WriteValue( NSData.FromString (sendText.Text), write_desc);
我还打印了我保存的所有特征的UUID，并使用Mac的LightBlue应用程序验证了它们的正确性。
我很好奇我是否需要做任何其他准备工作才能执行此写操作？
我已将我的代码附加到该帖子的底部。
谢谢，
奥斯丁
码：
partial class ThirdViewController : UIViewController
{
CBService serviceNeeded;
private string serv_to_find = "6e400001-b5a3-f393-e0a9-e50e24dcca9e";
private string read_to_find = "6e400003-b5a3-f393-e0a9-e50e24dcca9e";
private string write_to_find = "6e400002-b5a3-f393-e0a9-e50e24dcca9e";
CBPeripheral connectedPeripheral;
CBCharacteristic write;
CBCharacteristic read;
CBDescriptor write_desc;
private string value = "";
List<CBPeripheral> ps = new List<CBPeripheral> ();
public ThirdViewController (IntPtr handle) : base (handle)
{
}
public ThirdViewController ()
{
}
public override void ViewDidLoad ()
{
base.ViewDidLoad ();
MyPickerModel model = new MyPickerModel ();
// Tie model to selected event
model.comSelected += (object sender, EventArgs e) =>
{
value = model.selectedCom;
};
// wire up the DiscoveredPeripheral event to update the table
BluetoothLEManager.Current.DeviceDiscovered += (object sender, CBDiscoveredPeripheralEventArgs e) => {
ps = BluetoothLEManager.Current.DiscoveredDevices;
textBox.Text += "\nFound device: ";
foreach (var temp in ps)
{
model.Add(temp.Name);
if (value == ""){
value = temp.Name;
}
textBox.Text += temp.Name + "\n";
}
Blue_Picker.Model = model;
};
BluetoothLEManager.Current.ScanTimeoutElapsed += (sender, e) => {
textBox.Text += "\nScan Timeout.";
BluetoothLEManager.Current.StopScanningForDevices ();
};
}
partial void Logout_Button_TouchUpInside (UIButton sender)
{
// Create an instance of our AppDelegate
var appDelegate = UIApplication.SharedApplication.Delegate as AppDelegate;
// Get an instance of our MainStoryboard.storyboard
var mainStoryboard = appDelegate.MainStoryboard;
// Get an instance of our Login Page View Controller
var loginPageViewController = appDelegate.GetViewController(mainStoryboard, "LoginPageViewController") as LoginPageViewController;
// Wire our event handler to show the MainTabBarController after we successfully logged in.
loginPageViewController.OnLoginSuccess += (s, e) =>
{
var tabBarController = appDelegate.GetViewController(mainStoryboard, "MainTabBarController");
appDelegate.SetRootViewController(tabBarController, true);
};
// Set the Login Page as our RootViewController
appDelegate.SetRootViewController(loginPageViewController, true);
}
partial void ScanButton_TouchUpInside (UIButton sender)
{
if (BluetoothLEManager.Current.IsScanning)
{
BluetoothLEManager.Current.StopScanningForDevices ();
textBox.Text += "\nDone Scanning";
}
else
{
BluetoothLEManager.Current.BeginScanningForDevices ();
textBox.Text += "\nNow Scanning";
}
}
partial void DisconnectButton_TouchUpInside (UIButton sender)
{
if (connectedPeripheral == null) {
textBox.Text += "\nNo device connected.";
return;
}
textBox.Text += "\nDisconnecting from device " + connectedPeripheral.Name + "...";
BluetoothLEManager.Current.DisconnectPeripheral (connectedPeripheral);
connectedPeripheral = null;
Blue_Picker.Hidden = false;
}
async partial void ConnectButton_TouchUpInside (UIButton sender)
{
if (connectedPeripheral != null) {
textBox.Text += "\nDevice already connected.";
return;
}
StopScanning ();
textBox.Text += "\nConnecting to device " + value + "...";
foreach (var temp in ps){
if (temp.Name == value){
BluetoothLEManager.Current.CentralBleManager.ConnectPeripheral (temp, new PeripheralConnectionOptions ());
await Task.Delay(5000);
connectedPeripheral = temp;
InitializePeripheral();
break;
}
}
Blue_Picker.Hidden = true;
}
void StopScanning()
{
Task.Factory.StartNew (() => {
if (!BluetoothLEManager.Current.IsScanning)
return;
BluetoothLEManager.Current.StopScanningForDevices ();
});
}
void InitializePeripheral ()
{
// update all our shit
// > peripheral
// > service[s]
// > characteristic
// > value
// > descriptor[s]
connectedPeripheral.DiscoveredService += HandleDiscoveredService;
connectedPeripheral.DiscoveredCharacteristic += (sender, e) => {
HandleDiscoveredCharacteristic((CBPeripheral)sender, serviceNeeded);
};
connectedPeripheral.DiscoveredDescriptor += HandleDiscoveredDescriptor;
connectedPeripheral.DiscoverServices ();
textBox.Text += "\nLooking for services";
}
void HandleDiscoveredService (object sender, NSErrorEventArgs e)
{
var peripheral = (CBPeripheral)sender;
//foreach (CBService service in peripheral.Services) {
// textBox.Text += "\nDiscovered Service: " + service.UUID.ToString();
// if (!services.Contains (service))
// services.Add (service);
//}
foreach (CBService service in peripheral.Services) {
if (service.UUID.ToString().Contains(serv_to_find)) {
serviceNeeded = service;
}
}
if (serviceNeeded == null)
return;
textBox.Text += "\nDiscovered service: " + serviceNeeded.UUID.ToString ();
// discover the charactersistics
connectedPeripheral.DiscoverCharacteristics(serviceNeeded);
}
void HandleDiscoveredCharacteristic (CBPeripheral peripheral, CBService service)
{
foreach (CBService srv in peripheral.Services) {
// if the service has characteristics yet
if (srv.Characteristics == null)
continue;
foreach (var characteristic in service.Characteristics) {
if (characteristic.UUID.ToString ().Contains (read_to_find)) {
read = characteristic;
textBox.Text += "\nDiscovered read characteristic: " + read.UUID.ToString();
connectedPeripheral.DiscoverDescriptors (read);
}
else if (characteristic.UUID.ToString ().Contains (write_to_find)) {
write = characteristic;
textBox.Text += "\nDiscovered write characteristic: " + write.UUID.ToString();
connectedPeripheral.DiscoverDescriptors (write);
}
}
}
}
void HandleDiscoveredDescriptor (object sender, CBCharacteristicEventArgs e)
{
foreach (var descriptor in e.Characteristic.Descriptors) {
if (e.Characteristic.UUID == write.UUID) {
textBox.Text += "\nWrite descriptor: " + descriptor.ToString ();
write_desc = descriptor;
}
else if (e.Characteristic.UUID == read.UUID) {
textBox.Text += "\nRead descriptor: " + descriptor.ToString ();
}
}
}
partial void SendButton_TouchUpInside (UIButton sender)
{
textBox.Text += "\nNow writing: " + sendText.Text;
connectedPeripheral.WriteValue( NSData.FromString (sendText.Text), write_desc);
}
}
我也尝试过：
connectedPeripheral.WriteValue( NSData.FromString (sendText.Text), write, CBCharacteristicWriteType.WithoutResponse);
这似乎也不起作用。
最佳答案
Monkey Robotics有点过时且不完整。看看xabre/xamarin-bluetooth-le。基本上就是Monkey Robotics，它填补了空白。使用起来更容易。
关于ios - Xamarin蓝牙LE，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/35850094/