Add port property and test get/set its value

Sources/OpenVPNAdapter/OpenVPNConfiguration.h

@@ -43,6 +43,12 @@ typedef NS_ENUM(NSInteger, OpenVPNTLSCertProfile);
  */
 @property (nullable, nonatomic) NSString *server;
 
+/**
+ Use a different port than that specified in "remote"
+ option of profile
+ */
+@property (nonatomic) NSUInteger port;
+
 /**
  Force a given transport protocol
  */

Sources/OpenVPNAdapter/OpenVPNConfiguration.mm

@@ -268,6 +268,18 @@ NSString *const OpenVPNTLSCertProfileDefaultValue = @"default";
     _config.serverOverride = serverOverride ? std::string([serverOverride UTF8String]) : "";
 }
 
+- (NSUInteger)port {
+    try {
+        return std::stoul(_config.portOverride, NULL);
+    } catch (...) {
+        return 0;
+    }
+}
+
+- (void)setPort:(NSUInteger)port {
+    _config.portOverride = std::to_string(port);
+}
+
 - (OpenVPNTransportProtocol)proto {
     NSString *currentValue = [NSString stringWithUTF8String:_config.protoOverride.c_str()];
     return [OpenVPNConfiguration getTransportProtocolFromValue:currentValue];