Important Updates:

- FunctionCore:
  - Output() returns largest no of bytes written to linked input
- SelectableCore:
  - Auto-manage:
    - Add AutoManage param -> Persistent
    - Will automatic open port if written to when Auto-Manage enabled
    - Will keep port open (re-open if closed) if Persistent = true
  - DNS resolve:
    - Set AddressFailed if port could not open/bind
    - Only use next resolved address if current address failed

SelectableCore.h

@@ -75,7 +75,9 @@ struct SHandle {
     // State
     int             FD;
     EConnectState   State;
+
     bool            AutoManage;
+    bool            Persistent;
 
     // Callback functions
     FHandleCallback StateCallback[ 6 ];
@@ -89,6 +91,7 @@ struct SHandle {
     char            * PortName;     // Socket port no or protocol, e.g. "80" or "HTTP"
     struct addrinfo * AddressList;  // List of resolved IP Addresses for host name
     struct addrinfo * AddressInfo;  // Current selected IP Address
+    bool            AddressFailed;  // Indicate failure to connect to address
     bool            KeepAlive;      // Socket keep alive
 
     // Buffers
@@ -241,7 +244,7 @@ public:
 
     THandle *   CreateHandle( const char * HandleName, bool CreateChannel );
     bool    SetCallback( THandle * Handle, EConnectState pState, FHandleCallback pCallback );
-    bool    SetAutoManage( THandle * Handle, bool AutoManage, int ReopenTime = 0 );
+    bool    SetAutoManage( THandle * Handle, bool AutoManage, bool Persistent, int ReopenTime = 0 );
     bool    SetBuffers( THandle * Handle, int InBufSize, int OutBufSize, int InTimeout, const char * InMarker, int InMarkerLen );
     bool    SerialConfig( THandle * Handle, int Baud, short DataBits, short StopBits, short Parity, short FlowCtrl, int Wait );