我想出了如何解决我的问题,并且我对蓝牙连接的了解现在有点大了。如果其他人对此有问题,我会提供我的解决方案。代码示例表示具有 32feet 蓝牙库的蓝牙控制器的 C# 实现。
扫描
这意味着检测到范围内的设备。我的代码:
// mac is mac address of local bluetooth device
BluetoothEndPoint localEndpoint = new BluetoothEndPoint(mac, BluetoothService.SerialPort);
// client is used to manage connections
BluetoothClient localClient = new BluetoothClient(localEndpoint);
// component is used to manage device discovery
BluetoothComponent localComponent = new BluetoothComponent(localClient);
// async methods, can be done synchronously too
localComponent.DiscoverDevicesAsync(255, true, true, true, true, null);
localComponent.DiscoverDevicesProgress += new EventHandler<DiscoverDevicesEventArgs>(component_DiscoverDevicesProgress);
localComponent.DiscoverDevicesComplete += new EventHandler<DiscoverDevicesEventArgs>(component_DiscoverDevicesComplete);
private void component_DiscoverDevicesProgress(object sender, DiscoverDevicesEventArgs e)
{
// log and save all found devices
for (int i = 0; i < e.Devices.Length; i++)
{
if (e.Devices[i].Remembered)
{
Print(e.Devices[i].DeviceName + " (" + e.Devices[i].DeviceAddress + "): Device is known");
}
else
{
Print(e.Devices[i].DeviceName + " (" + e.Devices[i].DeviceAddress + "): Device is unknown");
}
this.deviceList.Add(e.Devices[i]);
}
}
private void component_DiscoverDevicesComplete(object sender, DiscoverDevicesEventArgs e)
{
// log some stuff
}
配对
这意味着设备与本地蓝牙设备耦合。这需要通过输入双方的代码来完成一次。可以通过代码完成,这样用户甚至不会注意到添加了设备。我为此目的的代码:
// get a list of all paired devices
BluetoothDeviceInfo[] paired = localClient.DiscoverDevices(255, false, true, false, false);
// check every discovered device if it is already paired
foreach (BluetoothDeviceInfo device in this.deviceList)
{
bool isPaired = false;
for (int i = 0; i < paired.Length; i++)
{
if (device.Equals(paired[i]))
{
isPaired = true;
break;
}
}
// if the device is not paired, pair it!
if (!isPaired)
{
// replace DEVICE_PIN here, synchronous method, but fast
isPaired = BluetoothSecurity.PairRequest(device.DeviceAddress, DEVICE_PIN);
if (isPaired)
{
// now it is paired
}
else
{
// pairing failed
}
}
}
连接
这意味着建立连接并交换数据。再次一些代码:
// check if device is paired
if (device.Authenticated)
{
// set pin of device to connect with
localClient.SetPin(DEVICE_PIN);
// async connection method
localClient.BeginConnect(device.DeviceAddress, BluetoothService.SerialPort, new AsyncCallback(Connect), device);
}
// callback
private void Connect(IAsyncResult result)
{
if (result.IsCompleted)
{
// client is connected now :)
}
}
如果您保持订单扫描、配对、连接,一切都应该正常。要发送或接收数据,请GetStream()
使用BluetoothClient
. 它提供了一个可以操作的网络流。
接收连接
如果您希望另一台设备与您的设备连接,您需要监听传入的连接请求。这仅适用于设备之前已配对的情况。我的代码:
BluetoothListener l = new BluetoothListener(LOCAL_MAC, BluetoothService.SerialPort);
l.Start(10);
l.BeginAcceptBluetoothClient(new AsyncCallback(AcceptConnection), l);
void AcceptConnection(IAsyncResult result){
if (result.IsCompleted){
BluetoothClient remoteDevice = ((BluetoothListener)result.AsyncState).EndAcceptBluetoothClient(result);
}
}
替换LOCAL_MAC
为有效的蓝牙地址(例如,使用BluetoothAddress.Parse();
)。设备连接后,它们可以通过底层流交换消息。如果连接不起作用,则可能存在身份验证问题,因此请尝试在侦听器中设置本地设备引脚(l.SetPin(LOCAL_MAC, MY_PASSWORD);