在C#中,我试图获取CoAP客户端的IP地址。这有可能吗?我尝试查找收到的交换对象,但似乎找不到IP地址。
客户
class Program
{
private static string _port = "5683";
static void Main(string[] args)
{
Request request = new Request(Method.GET);
Uri uri = new Uri("coap://127.0.0.1:" + _port + "/" + "Test");
request.URI = uri;
byte[] payload = Encoding.ASCII.GetBytes("test");
request.Payload = payload;
request.Send();
// wait for one response
Response response = request.WaitForResponse();
Debug.WriteLine(response);
}
}
服务器
public Task<string> OpenAsync(CancellationToken cancellationToken)
{
try
{
_server = new CoapServer(_port);
_server.Add(new MessageResource(_path);
_server.Start();
} catch (Exception ex)
{
throw;
}
}
消息资源(用于服务器)
public class MessageResource : CoAP.Server.Resources.Resource
{
public MessageResource(string path) : base(path)
{
}
protected async override void DoGet(CoapExchange exchange)
{
try
{
var payload = exchange.Request.Payload;
if (payload != null)
{
exchange.Respond(payloadString);
} else
{
throw new Exception("Payload is null. No actor has been made.");
}
}
catch (Exception ex)
{
throw;
}
}
}
如您所见,我想接收发送消息的客户端的IP地址。我尝试检查交换对象的所有属性,但似乎找不到可以使用的IP地址。
答案 0 :(得分:2)
显然,该IP地址位于exchange.Request.Source.ToString()下。如果您是从localhost而不是127.0.0.1发送一个程序包,它将仅显示localhost并使其更难找到。
"Uri uri = new Uri("coap://localhost:" + _port + "/" + "Test");"
编辑:另外,也许对于将来需要此服务的人:如果您仅需要IP地址或端口,请不要拆分exchange.Request.Source。 Visual Studio自动将exchange.Request.Source解析为Endpoint。这应该是IPEndpoint而不是Endpoint,因为如果它是Endpoint,则会丢失“ Address”和“ Port”属性。您可以这样修复它:
if (exchange.Request.Source is IPEndPoint p)
{
//p.Address
//p.Port
}
else
{
//Handle errors here
}