 
 	/// disconnect requests set (断开连接请求的集合)
     internal var disconnectRequests                = Set<DisconnectRequest>()
-
-	/// requests of service discovering (发现服务请求的集合)
-    internal var serviceDiscoveringRequests        = Set<ServiceDiscoveringRequest>()
-
-	/// requests of characteristic discovering (发现特征请求的集合)
-    internal var characteristicDiscoveringRequests = Set<CharacteristicDiscoveringRequest>()
-
-	/// requests of write characteristic value (写值请求的集合)
-    internal var writeRequests                     = Set<WriteRequest>()
-
-	/// requests of read characteristic value (读值请求的集合)
-    internal var readRequests                      = Set<ReadRequest>()
-
-	/// requests of subscribe characteristic value (订阅请求的集合)
-    internal var subscribeRequests                 = Set<SubscribeRequest>()
-
-	/// requests of unsubscribe characteristic value (退订请求的集合)
-    internal var unsubscribeRequests               = Set<UnsubscribeRequest>()
-
-	/// requests of RSSI reading (信号强度查询请求的集合)
-    internal var RSSIRequests                      = Set<RSSIRequest>()
 
 	// MARK: Peripheral Sets
 

/// session operation serial queue identifier
private let QIDSesOp = "com.keyang.cusp.sessionOperationQ"

/// Bluetooth Low Energy library in swift (使用swift编写的BLE通讯框架)
public class Cusp: NSObject {

	/// Singleton (单例)
	public class var central: Cusp {
		struct Static {
			static let instance: Cusp = Cusp()
