Better device detection on Linux, Unix (#97)

Updated SerialDeviceList java to improve disconnect behavior for MacOS
Updated Linux device detection

Co-authored-by: dmitry-cherkas 
Co-authored-by: GKenn <gunnar.kennedy@gmail.com>

Author: tresf

src/main/java/jssc/SerialPortList.java

@@ -53,7 +53,7 @@ public class SerialPortList {
                 break;
             }
             case SerialNativeInterface.OS_MAC_OS_X: {
-                PORTNAMES_REGEXP = Pattern.compile("tty.(serial|usbserial|usbmodem).*");
+                PORTNAMES_REGEXP = Pattern.compile("(tty|cu)\\..*");
                 PORTNAMES_PATH = "/dev/";
                 break;
             }
@@ -330,12 +330,15 @@ private static String[] getUnixBasedPortNames(String searchPath, Pattern pattern
                     String fileName = file.getName();
                     if(!file.isDirectory() && !file.isFile() && pattern.matcher(fileName).find()){
                         String portName = searchPath + fileName;
-                        long portHandle = serialInterface.openPort(portName, false);//Open port without TIOCEXCL
-                        if(portHandle < 0 && portHandle != SerialNativeInterface.ERR_PORT_BUSY){
-                            continue;
-                        }
-                        else if(portHandle != SerialNativeInterface.ERR_PORT_BUSY) {
-                            serialInterface.closePort(portHandle);
+                        // For linux ttyS0..31 serial ports check existence by opening each of them
+                        if (fileName.startsWith("ttyS")) {
+	                        long portHandle = serialInterface.openPort(portName, false);//Open port without TIOCEXCL
+	                        if(portHandle < 0 && portHandle != SerialNativeInterface.ERR_PORT_BUSY){
+	                            continue;
+	                        }
+	                        else if(portHandle != SerialNativeInterface.ERR_PORT_BUSY) {
+	                            serialInterface.closePort(portHandle);
+	                        }
                         }
                         portsTree.add(portName);
                     }