fixed and improved ui

Source/Components/Interfaces/UDPStream/UDPSServer.h

@@ -58,6 +58,11 @@ public:
     /** Default maximum UDP payload size (bytes, EXCLUDING the 17-byte header). */
     static const uint32 UDPS_SERVER_DEFAULT_MAX_PAYLOAD = 1400u;
 
+    /** Largest legal UDP payload: IPv4 datagrams cap at 65507 bytes, of which
+     *  17 are the UDPS header. A larger MaxPayloadSize makes every sendto fail
+     *  with EMSGSIZE, so the configured value is clamped to this. */
+    static const uint32 UDPS_SERVER_MAX_UDP_PAYLOAD = 65507u - UDPS_HEADER_SIZE;
+
     UDPSServer();
     ~UDPSServer();