{

             // Create OPC UA client Object
              UA_Client     *clientclient = UA_Client_new();

               UA_ClientConfig_setDefault (UA_Client_getConfig((client)));


              // ShowEndPoints(endpointURL.c_str()); // Show all endpoints & tokens

               UA_ClientConfig * clientConfig = UA_Client_getConfig(client);

               clientConfig->securityMode = UA_MESSAGESECURITYMODE_NONE; //  Has to match with the endpoint

               clientConfig->securityPolicyUri = UA_STRING ("http://opcfoundation.org/UA/SecurityPolicy#None"); // The SecurityPolicy has to match the end point

               // Have to include in the security Policies the same security policy as the Token
               // If not added return error: 'Could not find the required SecurityPolicy for the UserToken'
               // if the security police is not good could return: 
               //   - 'Could not create securityContext'
               //   - 'Could not instantiate the SecurityPolicy for the UserToken'

               cout << " Adding Security Policy in the Client for Token" << endl;

               clientConfig->securityPoliciesSize = 2;

               UA_SecurityPolicy *tmp = (UA_SecurityPolicy *)
                       UA_realloc(clientConfig->securityPolicies, sizeof(UA_SecurityPolicy) * clientConfig->securityPoliciesSize );

               clientConfig->securityPolicies = tmp; // Get the Policy memory created

               cout << "[OPC UA] Adding Security Policy: None" << endl;

               UA_SecurityPolicy_None(&clientConfig->securityPolicies[0], NULL,
                                                   UA_BYTESTRING_NULL, &clientConfig->logger);

               // Load certificate & key from local folder

               cout << "[OPC UA] Adding Security Policy: Basic128Rsa15" << endl;

               UA_ByteString cert = LoadFile ("ca.crt"); //    
               UA_ByteString key = LoadFile ("ca.key");  // 

               UA_SecurityPolicy_Basic128Rsa15(&clientConfig->securityPolicies[1], NULL,
                                                   cert, key, &clientConfig->logger);

               // Delete certificate files
               UA_ByteString_deleteMembers(&cert);
               UA_ByteString_deleteMembers(&key);

               cout << " Configured Security Policy : " << clientConfig->securityPoliciesSize << endl;

               // Adding Security Policy for the UserToken (user name & password) that is separated from client security policy
               // This token was prepared based on the Discovery Endpoints

               clientConfig->userTokenPolicy.policyId  = UA_STRING_STATIC("UserName");
               clientConfig->userTokenPolicy.tokenType = UA_USERTOKENTYPE_USERNAME;
               clientConfig->userTokenPolicy.issuedTokenType = UA_STRING_NULL;
               clientConfig->userTokenPolicy.issuerEndpointUrl = UA_STRING_NULL;
               clientConfig->userTokenPolicy.securityPolicyUri = UA_STRING ("http://opcfoundation.org/UA/SecurityPolicy#Basic128Rsa15"); // Basic128Rsa15

               cout << " [OPC UA] Try to connect to " << endpointURL.c_str() << endl;

               status = UA_Client_connect_username (client,endpointURL.c_str(),username.c_str(), password.c_str());// Set Security Policy = NONE, Message Security Mode = NONE
              }