It says "Attempt to connect failed, becaouse of the target has no response in a period of time, or connection establish faild, because the server had no response"

System.Net.Sockets.SocketException: 連線嘗試失敗，因為連線對象有一段時間並未正確回應，或是連線建立失敗，因為連線的主機無法回應。 08001723BA4D:0000110100001000800000805f9b34fb
   於 System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
   於 System.Net.Sockets.Socket.Connect(EndPoint remoteEP)
   於 InTheHand.Net.Sockets.BluetoothClient.Connect(BluetoothEndPoint remoteEP)

I tried many devices with BT, but none of them can make connection.

thanks!!