resubmit - 2 collector support-include readme ..

Issue-ID: CERT-16
Change-Id: If75efb06b6722ea26319e892bf1449207048ec9c
Signed-off-by: gp2421 <gp2421@att.com>

5 files changed, 460 insertions, 879 deletions

diff --git a/vnfs/VES5.0/evel/evel-library/code/evel_library/evel.c b/vnfs/VES5.0/evel/evel-library/code/evel_library/evel.c
index 488e073a..fbe3de41 100644
--- a/vnfs/VES5.0/evel/evel-library/code/evel_library/evel.c
+++ b/vnfs/VES5.0/evel/evel-library/code/evel_library/evel.c
@@ -70,7 +70,6 @@ char *functional_role = NULL;
  * @param   topic   The optional topic part of the URL (may be NULL).
  * @param   ring buf size  Ring buffer size
  * @param   secure  Whether to use HTTPS (0=HTTP, 1=HTTPS)
- * @param   activmode  Whether to use ActivStandby(0) collectors or ActiveStandby(1)
  * @param   cert_file_path     Path to client certificate file
  * @param   key_file_path      Path to client key file
  * @param   ca_info            Path to CA cert file
@@ -100,7 +99,6 @@ EVEL_ERR_CODES evel_initialize(const char * const fqdn,
                                const char * const topic,
                                int ring_buf_size,
                                int secure,
-                               int activmode,
                                const char * const cert_file_path,
                                const char * const key_file_path,
                                const char * const ca_info,
@@ -308,7 +306,6 @@ EVEL_ERR_CODES evel_initialize(const char * const fqdn,
                                 bakup_source_ip,
                                 ring_buf_size,
                                 secure,
-                                activmode,
                                 cert_file_path,
                                 key_file_path,
                                 ca_info,
diff --git a/vnfs/VES5.0/evel/evel-library/code/evel_library/evel.h b/vnfs/VES5.0/evel/evel-library/code/evel_library/evel.h
index c8587269..d62911de 100644
--- a/vnfs/VES5.0/evel/evel-library/code/evel_library/evel.h
+++ b/vnfs/VES5.0/evel/evel-library/code/evel_library/evel.h
@@ -1435,7 +1435,6 @@ typedef struct copyright {
  * @param   topic   The optional topic part of the URL (may be NULL).
  * @param   ring_buf_size   Ring buffer size (>=100) ~ Avg Messages in 1hr
  * @param   secure  Whether to use HTTPS (0=HTTP, 1=HTTPS).
- * @param   activmode  Whether to use ActiveActive or ActiveStandby collector mode
  * @param   cert_file_path     Path to client certificate file
  * @param   key_file_path      Path to client key file
  * @param   ca_info            Path to CA info
@@ -1465,7 +1464,6 @@ EVEL_ERR_CODES evel_initialize(const char * const fqdn,
                                const char * const topic,
                                int ring_buf_size,
                                int secure,
-                               int activmode,
                                const char * const cert_file_path,
                                const char * const key_file_path,
                                const char * const ca_info,
diff --git a/vnfs/VES5.0/evel/evel-library/code/evel_library/evel_event_mgr.c b/vnfs/VES5.0/evel/evel-library/code/evel_library/evel_event_mgr.c
index 4fb195c1..347f0284 100644
--- a/vnfs/VES5.0/evel/evel-library/code/evel_library/evel_event_mgr.c
+++ b/vnfs/VES5.0/evel/evel-library/code/evel_library/evel_event_mgr.c
@@ -1,6 +1,6 @@
 /*************************************************************************//**
  *
- * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
  *
  * Unless otherwise specified, all software contained herein is
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -41,7 +41,12 @@
  * How long we're prepared to wait for the API service to respond in
  * seconds.
  *****************************************************************************/
-static const int EVEL_API_TIMEOUT = 10;
+static const int EVEL_API_TIMEOUT = 5;
+
+/**************************************************************************//**
+ * Wait time if both the collectors are not responding
+ *****************************************************************************/
+static const int EVEL_COLLECTOR_RECONNECTION_WAIT_TIME = 120;
 
 /*****************************************************************************/
 /* Prototypes of locally scoped functions.                                   */
@@ -58,28 +63,23 @@ static bool evel_tokens_match_command_list(const MEMORY_CHUNK * const chunk,
 static bool evel_token_equals_string(const MEMORY_CHUNK * const chunk,
                                      const jsmntok_t * const json_token,
                                      const char * check_string);
-static void * event_multi_handler(void * arg __attribute__ ((unused)));
+static EVEL_ERR_CODES evel_setup_curl();
 
 /**************************************************************************//**
  * Buffers for error strings from libcurl.
  *****************************************************************************/
 static char curl_err_string[CURL_ERROR_SIZE] = "<NULL>";
-static char curl_err_string2[CURL_ERROR_SIZE] = "<NULL>";
 
 /**************************************************************************//**
  * Handle for the API into libcurl.
  *****************************************************************************/
 static CURL * curl_handle = NULL;
-static CURL * curl_handle2 = NULL;
-static CURLM * multi_handle = NULL;
 int curr_global_handles = 0;
-int activmode = -1;
 
 /**************************************************************************//**
  * Special headers that we send.
  *****************************************************************************/
 static struct curl_slist * hdr_chunk = NULL;
-static struct curl_slist * hdr_chunk2 = NULL;
 
 /**************************************************************************//**
  * Message queue for sending events to the API.
@@ -115,7 +115,28 @@ static char * evel_bevent_api_url;
 static char * evel_bthrot_api_url;
 static char * evel_bbatch_api_url;
 
-
+/**************************************************************************//**
+ * Storage for other CURL related parameters
+ *****************************************************************************/
+int evel_secure = -1;
+int evel_verbosity = -1;
+
+long evel_verify_peer = 0;
+long evel_verify_host = 0;
+
+static char * evel_source_ip = NULL;
+static char * evel_source_ip_bakup = NULL;
+static char * evel_cert_file_path = NULL;
+static char * evel_key_file_path = NULL;
+static char * evel_ca_info = NULL;
+static char * evel_ca_file_path = NULL;
+static char * evel_username = NULL;
+static char * evel_password = NULL;
+static char * evel_username2 = NULL;
+static char * evel_password2 = NULL;
+
+static int http_response_code = 0;
+static int evel_collector_id = 0;
 /**************************************************************************//**
  * Initialize the event handler.
  *
@@ -147,7 +168,6 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                                         const char * const source_ip_bakup,
                                         int ring_buf_size,
                                         int secure,
-                                        int activitymode,
                                         const char * const cert_file_path,
                                         const char * const key_file_path,
                                         const char * const ca_info,
@@ -161,9 +181,7 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                                         int verbosity)
 {
   int rc = EVEL_SUCCESS;
-  CURLcode curl_rc = CURLE_OK;
   char batch_api_url[EVEL_MAX_URL_LEN + 1] = {0};
-  char local_address[64];
 
   EVEL_ENTER();
 
@@ -180,7 +198,6 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
     assert(password2 != NULL);
   }
 
-
   /***************************************************************************/
   /* Store the API URLs.                                                     */
   /***************************************************************************/
@@ -191,13 +208,14 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
   assert(evel_batch_api_url != NULL);
   evel_throt_api_url = strdup(throt_api_url);
   assert(evel_throt_api_url != NULL);
+
   curr_global_handles = 1;
 
   if( bakup_api_url != NULL )
   {
     evel_bevent_api_url = strdup(bakup_api_url);
     assert(evel_bevent_api_url != NULL);
-    sprintf(batch_api_url,"%s/eventBatch",event_api_url);
+    sprintf(batch_api_url,"%s/eventBatch",bakup_api_url);
     evel_bbatch_api_url = strdup(batch_api_url);
     assert(evel_bbatch_api_url != NULL);
     evel_bthrot_api_url = strdup(throt_api_url);
@@ -205,6 +223,84 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
     curr_global_handles = 2;
   }
 
+  /***************************************************************************/
+  /* Store other parameters
+  /***************************************************************************/
+  evel_secure = secure;
+  evel_verbosity = verbosity;
+
+  evel_verify_peer = verify_peer;
+  evel_verify_host = verify_host;
+
+  evel_source_ip = NULL;
+  if (source_ip != NULL)
+  {
+    evel_source_ip = strdup(source_ip);
+    assert(evel_source_ip != NULL);
+  }
+
+  evel_source_ip_bakup = NULL;
+  if (source_ip_bakup != NULL)
+  {
+    evel_source_ip_bakup = strdup(source_ip_bakup);
+    assert(evel_source_ip_bakup != NULL);
+  }
+
+  evel_cert_file_path = NULL;
+  if (cert_file_path != NULL)
+  {
+    evel_cert_file_path = strdup(cert_file_path);
+    assert(evel_cert_file_path != NULL);
+  }
+
+  evel_key_file_path = NULL;
+  if (key_file_path != NULL)
+  {
+    evel_key_file_path = strdup(key_file_path);
+    assert(evel_key_file_path != NULL);
+  }
+
+  evel_ca_info = NULL;
+  if (ca_info != NULL)
+  {
+    evel_ca_info = strdup(ca_info);
+    assert(evel_ca_info != NULL);
+  }
+
+  evel_ca_file_path = NULL;
+  if (ca_file_path != NULL)
+  {
+    evel_ca_file_path = strdup(ca_file_path);
+    assert(evel_ca_file_path != NULL);
+  }
+
+  evel_username = NULL;
+  if (username != NULL)
+  {
+    evel_username = strdup(username);
+    assert(evel_username != NULL);
+  }
+
+  evel_password = NULL;
+  if (password != NULL)
+  {
+    evel_password = strdup(password);
+    assert(evel_password != NULL);
+  }
+
+  evel_username2 = NULL;
+  if (username2 != NULL)
+  {
+    evel_username2 = strdup(username2);
+    assert(evel_username2 != NULL);
+  }
+
+  evel_password2 = NULL;
+  if (password2 != NULL)
+  {
+    evel_password2 = strdup(password2);
+    assert(evel_password2 != NULL);
+  }
 
   curl_version_info_data *d = curl_version_info(CURLVERSION_NOW);
   /* compare with the 24 bit hex number in 8 bit fields */
@@ -215,6 +311,98 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
   else {
      EVEL_INFO("Old Curl version.");
   }
+
+  /***************************************************************************/
+  /* Initialize a message ring-buffer to be used between the foreground and  */
+  /* the thread which sends the messages.  This can't fail.                  */
+  /***************************************************************************/
+  if( ring_buf_size < EVEL_EVENT_BUFFER_DEPTH )
+  {
+    log_error_state("Warning: Failed to initialize Ring buffer size to %d. ",
+                    ring_buf_size);
+    goto exit_label;
+  }
+  ring_buffer_initialize(&event_buffer, EVEL_EVENT_BUFFER_DEPTH);
+
+exit_label:
+
+  EVEL_EXIT();
+
+  return rc;
+
+}
+/**************************************************************************//**
+ * Setup the curl connection to collector
+ *
+ * Primarily responsible for getting CURL ready to send message. Also it would
+ * be used to swithch over to other collector 
+ *****************************************************************************/
+static EVEL_ERR_CODES evel_setup_curl()
+{
+  int rc = EVEL_SUCCESS;
+  CURLcode curl_rc = CURLE_OK;
+  char local_address[64];
+  char * api_url = NULL;
+  char * username = NULL;
+  char * password = NULL;
+  char * source_ip = NULL;
+
+  EVEL_ENTER();
+
+  if (evel_collector_id > 4)
+  {
+    rc = EVEL_CURL_LIBRARY_FAIL;
+    log_error_state("Wrong evel_collector- value > 4");
+    goto exit_label;
+  }
+
+  /***************************************************************************/
+  /* Initialize the local variable with proper global variables that are     */
+  /* required to setup the connection                                        */
+  /***************************************************************************/
+  if (evel_collector_id == 1)
+  {
+     api_url = evel_event_api_url;
+     source_ip = evel_source_ip;
+     username = evel_username;
+     password = evel_password;
+  }
+  else if (evel_collector_id == 2)
+  {
+     api_url = evel_bevent_api_url;
+     source_ip = evel_source_ip_bakup;
+     username = evel_username2;
+     password = evel_password2;
+  }
+  else if (evel_collector_id == 3)
+  {
+     api_url = evel_batch_api_url;
+     source_ip = evel_source_ip;
+     username = evel_username;
+     password = evel_password;
+  }
+  else if (evel_collector_id == 4)
+  {
+     api_url = evel_bbatch_api_url;
+     source_ip = evel_source_ip_bakup;
+     username = evel_username2;
+     password = evel_password2;
+  }
+
+  /***************************************************************************/
+  /* Clean-up the cURL library.                                              */
+  /***************************************************************************/
+  if (curl_handle != NULL)
+  {
+    curl_easy_cleanup(curl_handle);
+    curl_handle = NULL;
+  }
+  if (hdr_chunk != NULL)
+  {
+    curl_slist_free_all(hdr_chunk);
+    hdr_chunk = NULL;
+  }
+
   /***************************************************************************/
   /* Start the CURL library. Note that this initialization is not threadsafe */
   /* which imposes a constraint that the EVEL library is initialized before  */
@@ -239,16 +427,6 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
     goto exit_label;
   }
 
-  if( bakup_api_url != NULL )
-  {
-     curl_handle2 = curl_easy_init();
-     if (curl_handle2 == NULL)
-     {
-       rc = EVEL_CURL_LIBRARY_FAIL;
-       log_error_state("Failed to get backup libCURL handle");
-       goto exit_label;
-     }
-  }
   /***************************************************************************/
   /* Prime the library to give friendly error codes.                         */
   /***************************************************************************/
@@ -263,25 +441,10 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
     goto exit_label;
   }
 
-  if( bakup_api_url != NULL )
-  {
-    curl_rc = curl_easy_setopt(curl_handle2,
-                             CURLOPT_ERRORBUFFER,
-                             curl_err_string2);
-    if (curl_rc != CURLE_OK)
-    {
-      rc = EVEL_CURL_LIBRARY_FAIL;
-      log_error_state("Failed to initialize libCURL2 to provide friendly errors. "
-                    "Error code=%d", curl_rc);
-      goto exit_label;
-    }
-  }
-
-
   /***************************************************************************/
   /* If running in verbose mode generate more output.                        */
   /***************************************************************************/
-  if (verbosity > 0)
+  if (evel_verbosity > 0)
   {
     curl_rc = curl_easy_setopt(curl_handle, CURLOPT_VERBOSE, 1L);
     if (curl_rc != CURLE_OK)
@@ -291,26 +454,12 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                       "Error code=%d", curl_rc);
       goto exit_label;
     }
-  if( bakup_api_url != NULL )
-  {
-    curl_rc = curl_easy_setopt(curl_handle2, CURLOPT_VERBOSE, 1L);
-    if (curl_rc != CURLE_OK)
-    {
-      rc = EVEL_CURL_LIBRARY_FAIL;
-      log_error_state("Failed to initialize libCURL to be verbose. "
-                      "Error code=%d", curl_rc);
-      goto exit_label;
-    }
-   }
-
   }
 
-
-
   /***************************************************************************/
   /* Set the URL for the API.                                                */
   /***************************************************************************/
-  curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, event_api_url);
+  curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, api_url);
   if (curl_rc != CURLE_OK)
   {
     rc = EVEL_CURL_LIBRARY_FAIL;
@@ -318,22 +467,7 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                     "Error code=%d (%s)", curl_rc, curl_err_string);
     goto exit_label;
   }
-  EVEL_INFO("Initializing CURL to send events to: %s", event_api_url);
-
-  if( bakup_api_url != NULL )
-  {
-    curl_rc = curl_easy_setopt(curl_handle2,
-                             CURLOPT_URL,
-                             bakup_api_url);
-    if (curl_rc != CURLE_OK)
-    {
-      rc = EVEL_CURL_LIBRARY_FAIL;
-      log_error_state("Failed to initialize libCURL with the API URL. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-      goto exit_label;
-    }
-  }
-
+  EVEL_INFO("Initializing CURL to send events to: %s", api_url);
 
   /***************************************************************************/
   /* send all data to this function.                                         */
@@ -348,21 +482,6 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                     "Error code=%d (%s)", curl_rc, curl_err_string);
     goto exit_label;
   }
-  if( bakup_api_url != NULL )
-  {
-    curl_rc = curl_easy_setopt(curl_handle2,
-                             CURLOPT_WRITEFUNCTION,
-                             evel_write_callback);
-    if (curl_rc != CURLE_OK)
-    {
-      rc = EVEL_CURL_LIBRARY_FAIL;
-      log_error_state("Failed to initialize libCURL with the API URL. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-      goto exit_label;
-    }
-  }
-
-
 
   /***************************************************************************/
   /* configure local ip address if provided */
@@ -385,46 +504,17 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
       }
     }
   }
-  if( source_ip_bakup != NULL )
-  {
-    snprintf(local_address,sizeof(local_address),source_ip_bakup);
-    if( local_address[0] != '\0' )
-    {
-      curl_rc = curl_easy_setopt(curl_handle2,
-                             CURLOPT_INTERFACE,
-                             local_address);
-      if (curl_rc != CURLE_OK)
-      {
-        rc = EVEL_CURL_LIBRARY_FAIL;
-        log_error_state("Failed to initialize bakup libCURL with the local address. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-        goto exit_label;
-      }
-    }
-  }
 
   /***************************************************************************/
   /* configure SSL options for HTTPS transfers */
   /***************************************************************************/
-  if( secure )
+  if( evel_secure )
   {
-    if( cert_file_path != NULL )
+    if( evel_cert_file_path != NULL )
     {
       curl_rc = curl_easy_setopt(curl_handle,
                              CURLOPT_SSLCERT,
-                             cert_file_path);
-      if (curl_rc != CURLE_OK)
-      {
-        rc = EVEL_CURL_LIBRARY_FAIL;
-        log_error_state("Failed to initialize libCURL with the client cert. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string);
-        goto exit_label;
-      }
-  if( bakup_api_url != NULL )
-  {
-      curl_rc = curl_easy_setopt(curl_handle2,
-                             CURLOPT_SSLCERT,
-                             cert_file_path);
+                             evel_cert_file_path);
       if (curl_rc != CURLE_OK)
       {
         rc = EVEL_CURL_LIBRARY_FAIL;
@@ -432,14 +522,13 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                     "Error code=%d (%s)", curl_rc, curl_err_string);
         goto exit_label;
       }
-  }
     }
 
-    if( key_file_path != NULL )
+    if( evel_key_file_path != NULL )
     {
       curl_rc = curl_easy_setopt(curl_handle,
                              CURLOPT_SSLKEY,
-                             key_file_path);
+                             evel_key_file_path);
       if (curl_rc != CURLE_OK)
       {
         rc = EVEL_CURL_LIBRARY_FAIL;
@@ -447,38 +536,13 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                     "Error code=%d (%s)", curl_rc, curl_err_string);
         goto exit_label;
       }
-  if( bakup_api_url != NULL )
-  {
-      curl_rc = curl_easy_setopt(curl_handle2,
-                             CURLOPT_SSLKEY,
-                             key_file_path);
-      if (curl_rc != CURLE_OK)
-      {
-        rc = EVEL_CURL_LIBRARY_FAIL;
-        log_error_state("Failed to initialize libCURL with the client key. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string);
-        goto exit_label;
-      }
-  }
     }
 
-    if( ca_info != NULL )
+    if( evel_ca_info != NULL )
     {
       curl_rc = curl_easy_setopt(curl_handle,
                              CURLOPT_CAINFO,
-                             ca_info);
-      if (curl_rc != CURLE_OK)
-      {
-        rc = EVEL_CURL_LIBRARY_FAIL;
-        log_error_state("Failed to initialize libCURL with the CA cert file. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string);
-        goto exit_label;
-      }
-  if( bakup_api_url != NULL )
-  {
-      curl_rc = curl_easy_setopt(curl_handle2,
-                             CURLOPT_CAINFO,
-                             ca_info);
+                             evel_ca_info);
       if (curl_rc != CURLE_OK)
       {
         rc = EVEL_CURL_LIBRARY_FAIL;
@@ -486,14 +550,13 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                     "Error code=%d (%s)", curl_rc, curl_err_string);
         goto exit_label;
       }
-  }
     }
 
-    if( ca_file_path != NULL )
+    if( evel_ca_file_path != NULL )
     {
       curl_rc = curl_easy_setopt(curl_handle,
                              CURLOPT_CAPATH,
-                             ca_file_path);
+                             evel_ca_file_path);
       if (curl_rc != CURLE_OK)
       {
         rc = EVEL_CURL_LIBRARY_FAIL;
@@ -501,24 +564,11 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                     "Error code=%d (%s)", curl_rc, curl_err_string);
         goto exit_label;
       }
-  if( bakup_api_url != NULL )
-  {
-      curl_rc = curl_easy_setopt(curl_handle2,
-                             CURLOPT_CAPATH,
-                             ca_file_path);
-      if (curl_rc != CURLE_OK)
-      {
-        rc = EVEL_CURL_LIBRARY_FAIL;
-        log_error_state("Failed to initialize libCURL with the CA cert path. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string);
-        goto exit_label;
-      }
-  }
     }
 
       curl_rc = curl_easy_setopt(curl_handle,
                              CURLOPT_SSL_VERIFYPEER,
-                             verify_peer);
+                             evel_verify_peer);
       if (curl_rc != CURLE_OK)
       {
         rc = EVEL_CURL_LIBRARY_FAIL;
@@ -528,7 +578,7 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
       }
       curl_rc = curl_easy_setopt(curl_handle,
                              CURLOPT_SSL_VERIFYHOST,
-                             verify_host);
+                             evel_verify_host);
       if (curl_rc != CURLE_OK)
       {
         rc = EVEL_CURL_LIBRARY_FAIL;
@@ -537,29 +587,6 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
         goto exit_label;
       }
 
-     if( bakup_api_url != NULL )
-     {
-      curl_rc = curl_easy_setopt(curl_handle2,
-                             CURLOPT_SSL_VERIFYPEER,
-                             verify_peer);
-      if (curl_rc != CURLE_OK)
-      {
-        rc = EVEL_CURL_LIBRARY_FAIL;
-        log_error_state("Failed to initialize libCURL with SSL Server verification. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string);
-        goto exit_label;
-      }
-      curl_rc = curl_easy_setopt(curl_handle2,
-                             CURLOPT_SSL_VERIFYHOST,
-                             verify_host);
-      if (curl_rc != CURLE_OK)
-      {
-        rc = EVEL_CURL_LIBRARY_FAIL;
-        log_error_state("Failed to initialize libCURL with Client host verification. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string);
-        goto exit_label;
-      }
-     }
   }
 
 
@@ -578,20 +605,6 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                     "Error code=%d (%s)", curl_rc, curl_err_string);
     goto exit_label;
   }
-  if( bakup_api_url != NULL )
-  {
-    curl_rc = curl_easy_setopt(curl_handle2,
-                             CURLOPT_USERAGENT,
-                             "libcurl-agent/1.0");
-    if (curl_rc != CURLE_OK)
-    {
-      rc = EVEL_CURL_LIBRARY_FAIL;
-      log_error_state("Failed to initialize libCURL with the API URL. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-      goto exit_label;
-    }
-  }
-
 
   /***************************************************************************/
   /* Specify that we are going to POST data.                                 */
@@ -604,18 +617,6 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                     "Error code=%d (%s)", curl_rc, curl_err_string);
     goto exit_label;
   }
-  if( bakup_api_url != NULL )
-  {
-    curl_rc = curl_easy_setopt(curl_handle2,CURLOPT_POST, 1L);
-    if (curl_rc != CURLE_OK)
-    {
-      rc = EVEL_CURL_LIBRARY_FAIL;
-      log_error_state("Failed to initialize libCURL with the API URL. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-      goto exit_label;
-    }
-  }
-
 
   /***************************************************************************/
   /* we want to use our own read function.                                   */
@@ -628,18 +629,6 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                     "function. Error code=%d (%s)", curl_rc, curl_err_string);
     goto exit_label;
   }
-  if( bakup_api_url != NULL )
-  {
-    curl_rc = curl_easy_setopt(curl_handle2,CURLOPT_READFUNCTION, read_callback);
-    if (curl_rc != CURLE_OK)
-    {
-      rc = EVEL_CURL_LIBRARY_FAIL;
-      log_error_state("Failed to initialize libCURL with the API URL. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-      goto exit_label;
-    }
-  }
-
 
   /***************************************************************************/
   /* All of our events are JSON encoded.  We also suppress the               */
@@ -662,21 +651,6 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                     "Error code=%d (%s)", curl_rc, curl_err_string);
     goto exit_label;
   }
-  if( bakup_api_url != NULL )
-  {
-    hdr_chunk2 = curl_slist_append(hdr_chunk2, "Content-type: application/json");
-    hdr_chunk2 = curl_slist_append(hdr_chunk2, "Expect:");
-    curl_rc = curl_easy_setopt(curl_handle2,CURLOPT_HTTPHEADER, hdr_chunk2);
-    if (curl_rc != CURLE_OK)
-    {
-      rc = EVEL_CURL_LIBRARY_FAIL;
-      log_error_state("Failed to initialize libCURL with the API URL. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-      goto exit_label;
-    }
-  }
-
-
 
   /***************************************************************************/
   /* Set the timeout for the operation.                                      */
@@ -691,18 +665,6 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                     "Error code=%d (%s)", curl_rc, curl_err_string);
     goto exit_label;
   }
-  if( bakup_api_url != NULL )
-  {
-    curl_rc = curl_easy_setopt(curl_handle2,CURLOPT_TIMEOUT, EVEL_API_TIMEOUT);
-    if (curl_rc != CURLE_OK)
-    {
-      rc = EVEL_CURL_LIBRARY_FAIL;
-      log_error_state("Failed to initialize libCURL with the API URL. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-      goto exit_label;
-    }
-  }
-
 
   /***************************************************************************/
   /* Set that we want Basic authentication with username:password Base-64    */
@@ -733,57 +695,6 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
     goto exit_label;
   }
 
-  if( bakup_api_url != NULL )
-  {
-  curl_rc = curl_easy_setopt(curl_handle2, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
-  if (curl_rc != CURLE_OK)
-  {
-    rc = EVEL_CURL_LIBRARY_FAIL;
-    log_error_state("Failed to initialize libCURL for Basic Authentication. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-    goto exit_label;
-  }
-  curl_rc = curl_easy_setopt(curl_handle2, CURLOPT_USERNAME, username2);
-  if (curl_rc != CURLE_OK)
-  {
-    rc = EVEL_CURL_LIBRARY_FAIL;
-    log_error_state("Failed to initialize libCURL with username. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-    goto exit_label;
-  }
-  curl_rc = curl_easy_setopt(curl_handle2, CURLOPT_PASSWORD, password2);
-  if (curl_rc != CURLE_OK)
-  {
-    rc = EVEL_CURL_LIBRARY_FAIL;
-    log_error_state("Failed to initialize libCURL with password. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-    goto exit_label;
-  }
-
-     multi_handle = curl_multi_init();;
-     if (multi_handle == NULL)
-     {
-       rc = EVEL_CURL_LIBRARY_FAIL;
-       log_error_state("Failed to get libCURL Multi handle");
-       goto exit_label;
-     }
-     activmode = activitymode;
-
-  }
-
-
-  /***************************************************************************/
-  /* Initialize a message ring-buffer to be used between the foreground and  */
-  /* the thread which sends the messages.  This can't fail.                  */
-  /***************************************************************************/
-  if( ring_buf_size < EVEL_EVENT_BUFFER_DEPTH )
-  {
-    log_error_state("Warning: Failed to initialize Ring buffer size to %d. ",
-                    ring_buf_size);
-    goto exit_label;
-  }
-  ring_buffer_initialize(&event_buffer, EVEL_EVENT_BUFFER_DEPTH);
-
   /***************************************************************************/
   /* Initialize the priority post buffer to empty.                           */
   /***************************************************************************/
@@ -816,11 +727,7 @@ EVEL_ERR_CODES event_handler_run()
   /* Start the event handler thread.                                         */
   /***************************************************************************/
   evt_handler_state = EVT_HANDLER_INACTIVE;
-  if( curr_global_handles <= 1 )
-      pthread_rc = pthread_create(&evt_handler_thread, NULL, event_handler, NULL);
-  else
-      pthread_rc = pthread_create(&evt_handler_thread, NULL, event_multi_handler, NULL);
-
+  pthread_rc = pthread_create(&evt_handler_thread, NULL, event_handler, NULL);
   if (pthread_rc != 0)
   {
     rc = EVEL_PTHREAD_LIBRARY_FAIL;
@@ -893,31 +800,16 @@ EVEL_ERR_CODES event_handler_terminate()
   /***************************************************************************/
   /* Clean-up the cURL library.                                              */
   /***************************************************************************/
-  if (multi_handle != NULL)
-  {
-     curl_multi_cleanup(multi_handle);
-  }
   if (curl_handle != NULL)
   {
     curl_easy_cleanup(curl_handle);
     curl_handle = NULL;
   }
-  if (curl_handle2 != NULL)
-  {
-    curl_easy_cleanup(curl_handle2);
-    curl_handle2 = NULL;
-  }
   if (hdr_chunk != NULL)
   {
     curl_slist_free_all(hdr_chunk);
     hdr_chunk = NULL;
   }
-  if (hdr_chunk2 != NULL)
-  {
-    curl_slist_free_all(hdr_chunk2);
-    hdr_chunk2 = NULL;
-  }
-
 
   /***************************************************************************/
   /* Free off the stored API URL strings.                                    */
@@ -1009,7 +901,6 @@ static EVEL_ERR_CODES evel_post_api(char * msg, size_t size)
   CURLcode curl_rc = CURLE_OK;
   MEMORY_CHUNK rx_chunk;
   MEMORY_CHUNK tx_chunk;
-  int http_response_code = 0;
 
   EVEL_ENTER();
 
@@ -1072,6 +963,8 @@ static EVEL_ERR_CODES evel_post_api(char * msg, size_t size)
   /***************************************************************************/
   /* Now run off and do what you've been told!                               */
   /***************************************************************************/
+  http_response_code = 0;
+
   curl_rc = curl_easy_perform(curl_handle);
   if (curl_rc != CURLE_OK)
   {
@@ -1201,312 +1094,6 @@ size_t evel_write_callback(void *contents,
   return realsize;
 }
 
-
-/**************************************************************************//**
- * Post an event to the Vendor Event Listener API.
- *
- * @returns Status code
- * @retval  EVEL_SUCCESS On success
- * @retval  "One of ::EVEL_ERR_CODES" On failure.
- *****************************************************************************/
-static EVEL_ERR_CODES evel_postmulti_message(char *msg, size_t size, int *still,
-                CURL *handle, CURL *bhandle, int numhandles )
-{
-  int rc = EVEL_SUCCESS;
-  CURLcode curl_rc = CURLE_OK;
-  MEMORY_CHUNK rx_chunk[2];
-  MEMORY_CHUNK tx_chunk[2];
-  int http_response_code = 0, i;
-
-  EVEL_ENTER();
-
-  EVEL_INFO("Sending :%s: %d\n",msg, numhandles);
-
-  /***************************************************************************/
-  /* Create the memory chunk to be used for the response to the post.  The   */
-  /* will be realloced.                                                      */
-  /***************************************************************************/
-for (i=0;i<numhandles;i++)
-{
-  rx_chunk[i].memory = malloc(1);
-  assert(rx_chunk[i].memory != NULL);
-  rx_chunk[i].size = 0;
-
-  /***************************************************************************/
-  /* Create the memory chunk to be sent as the body of the post.             */
-  /***************************************************************************/
-  tx_chunk[i].memory = msg;
-  tx_chunk[i].size = size;
-  EVEL_DEBUG("Sending chunk of size %d", tx_chunk[i].size);
-}
-
-  /***************************************************************************/
-  /* Point to the data to be received.                                       */
-  /***************************************************************************/
-  curl_rc = curl_easy_setopt(handle, CURLOPT_WRITEDATA, &rx_chunk[0]);
-  if (curl_rc != CURLE_OK)
-  {
-    rc = EVEL_CURL_LIBRARY_FAIL;
-    log_error_state("Failed to initialize libCURL rx to upload. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string);
-    goto exit_label;
-  }
-
-  /***************************************************************************/
-  /* Pointer to pass to our read function                                    */
-  /***************************************************************************/
-  curl_rc = curl_easy_setopt(handle, CURLOPT_READDATA, &tx_chunk[0]);
-  if (curl_rc != CURLE_OK)
-  {
-    rc = EVEL_CURL_LIBRARY_FAIL;
-    log_error_state("Failed to set upload data for libCURL tx to upload. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string);
-    goto exit_label;
-  }
-  /***************************************************************************/
-  /* Size of the data to transmit.                                           */
-  /***************************************************************************/
-  curl_rc = curl_easy_setopt(handle,
-                             CURLOPT_POSTFIELDSIZE,
-                             tx_chunk[0].size);
-  if (curl_rc != CURLE_OK)
-  {
-    rc = EVEL_CURL_LIBRARY_FAIL;
-    log_error_state("Failed to set length of upload data for libCURL to "
-                    "upload.  Error code=%d (%s)", curl_rc, curl_err_string);
-    goto exit_label;
-  }
-
-if(numhandles == 2)
-{
-
-  /***************************************************************************/
-  /* Point to the data to be received.                                       */
-  /***************************************************************************/
-  curl_rc = curl_easy_setopt(bhandle, CURLOPT_WRITEDATA, &rx_chunk[1]);
-  if (curl_rc != CURLE_OK)
-  {
-    rc = EVEL_CURL_LIBRARY_FAIL;
-    log_error_state("Failed to initialize libCURL2 rx to upload. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-    goto exit_label;
-  }
-
-  /***************************************************************************/
-  /* Pointer to pass to our read function                                    */
-  /***************************************************************************/
-  curl_rc = curl_easy_setopt(bhandle, CURLOPT_READDATA, &tx_chunk[1]);
-  if (curl_rc != CURLE_OK)
-  {
-    rc = EVEL_CURL_LIBRARY_FAIL;
-    log_error_state("Failed to set upload data for libCURL2 tx to upload. "
-                    "Error code=%d (%s)", curl_rc, curl_err_string2);
-    goto exit_label;
-  }
-  /***************************************************************************/
-  /* Size of the data to transmit.                                           */
-  /***************************************************************************/
-  curl_rc = curl_easy_setopt(bhandle,
-                             CURLOPT_POSTFIELDSIZE,
-                             tx_chunk[1].size);
-  if (curl_rc != CURLE_OK)
-  {
-    rc = EVEL_CURL_LIBRARY_FAIL;
-    log_error_state("Failed to set length of upload data for libCURL2 to "
-                    "upload.  Error code=%d (%s)", curl_rc, curl_err_string);
-    goto exit_label;
-  }
-
-}
-
-  /***************************************************************************/
-  /* Now run off and do what you've been told!                               */
-  /***************************************************************************/
-  curl_rc = curl_multi_perform(multi_handle, still);
-  if (curl_rc != CURLE_OK)
-  {
-    rc = EVEL_CURL_LIBRARY_FAIL;
-    log_error_state("Failed to transfer an multi event to Vendor Event Listener! "
-                    "Error code=%d (%s)", curl_rc, curl_multi_strerror(curl_rc
-));
-    EVEL_ERROR("Dropped event: %s", msg);
-    goto exit_label;
-  }
-
-  /***************************************************************************/
-  /* See what response we got - any 2XX response is good.                    */
-  /***************************************************************************/
-
-exit_label:
- for (i=0;i<numhandles;i++)
-    free(rx_chunk[i].memory);
-  EVEL_EXIT();
-
-  return(rc);
-}
-
-
-/**************************************************************************//**
- * Event Multi Post Handler.
- *
- * Watch for messages coming on the internal queue and send them to the
- * listener.
- *
- * param[in]  jsonmsg  json message to be sent.
- * param[in]  size     size of json message
- * param[in]  currhandle Primary handle
- * param[in]  url1     pimary url
- * param[in]  bakkhandle  Backup handle
- * param[in]  url2     secondary url
- *****************************************************************************/
-static int evel_post_multiapi(char *jsonmsg, size_t size,CURL *currhandle, char *url1,
-                                   CURL *bakkhandle, char *url2)
-{
-      int rc = EVEL_SUCCESS;
-      CURLcode curl_rc = 0;
-      int nhandles = 1;
-      int still_running,i;
-      CURLMsg *msg; /* for picking up messages with the transfer status */ 
-      int msgs_left; /* how many messages are left */
-
-      /***************************************************************************/
-      /* Set the URL for the API.                                                */
-      /***************************************************************************/
-      curl_rc = curl_easy_setopt(currhandle, CURLOPT_URL, url1);
-      if (curl_rc != CURLE_OK )
-      {
-        rc = EVEL_CURL_LIBRARY_FAIL;
-        log_error_state("Failed to initialize libCURL with the multi API URL. "
-                    "%s Error code=%d (%s)", url1, curl_rc, curl_err_string);
-      }
-
-      if( url2 != NULL && activmode == 1 )
-      {
-        curl_rc = curl_easy_setopt(bakkhandle, CURLOPT_URL, url2);
-        if (curl_rc != CURLE_OK)
-        {
-           rc = EVEL_CURL_LIBRARY_FAIL;
-           log_error_state("Failed to initialize libCURL with the API URL. "
-                    "%s Error code=%d (%s)", url2, curl_rc, curl_err_string2);
-        }
-        nhandles = 2;
-      }
-
-      /* we start some action by calling perform right away */
-      curl_multi_add_handle(multi_handle, currhandle);
-      if(nhandles==2){
-        curl_multi_add_handle(multi_handle, bakkhandle);
-      }
-
-      /* we start some action by calling perform right away */
-      curl_multi_perform(multi_handle, &still_running);
-
-  do {
-    struct timeval timeout;
-    int rc; /* select() return code */ 
-    CURLMcode mc; /* curl_multi_fdset() return code */ 
- 
-    fd_set fdread;
-    fd_set fdwrite;
-    fd_set fdexcep;
-    int maxfd = -1;
- 
-    long curl_timeo = -1;
- 
-    FD_ZERO(&fdread);
-    FD_ZERO(&fdwrite);
-    FD_ZERO(&fdexcep);
- 
-    /* set a suitable timeout to play around with */ 
-    timeout.tv_sec = 1;
-    timeout.tv_usec = 0;
- 
-    curl_multi_timeout(multi_handle, &curl_timeo);
-    if(curl_timeo >= 0) {
-      timeout.tv_sec = curl_timeo / 1000;
-      if(timeout.tv_sec > 1)
-        timeout.tv_sec = 1;
-      else
-        timeout.tv_usec = (curl_timeo % 1000) * 1000;
-    }
- 
-    /* get file descriptors from the transfers */ 
-    mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
- 
-    if(mc != CURLM_OK) {
-      EVEL_ERROR("curl_multi_fdset() failed, code %d.\n", mc);
-      break;
-    }
- 
-    /* On success the value of maxfd is guaranteed to be >= -1. We call
-       select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
-       no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
-       to sleep 100ms, which is the minimum suggested value in the
-       curl_multi_fdset() doc. */ 
- 
-    if(maxfd == -1) {
-#ifdef _WIN32
-      Sleep(100);
-      rc = 0;
-#else
-      /* Portable sleep for platforms other than Windows. */ 
-      struct timeval wait = { 0, 300000 }; /* 250ms */ 
-      rc = select(0, NULL, NULL, NULL, &wait);
-#endif
-    }
-    else {
-      /* Note that on some platforms 'timeout' may be modified by select().
-         If you need access to the original value save a copy beforehand. */ 
-      rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
-    }
- 
-    switch(rc) {
-    case -1:
-      /* select error */ 
-      break;
-    case 0: /* timeout */ 
-    default: /* action */ 
-      //curl_multi_perform(multi_handle, &still_running);
-      evel_postmulti_message(jsonmsg, size, &still_running, currhandle, bakkhandle, nhandles);
-    }
-  } while(still_running);
- 
-  /* See how the transfers went */ 
-  while((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
-    if(msg->msg == CURLMSG_DONE) {
-      int idx, found = 0;
-      EVEL_DEBUG("Transfer status - %s\n", curl_multi_strerror(msg->data.result));
-
-      /* Find out which handle this message is about */ 
-      for(idx = 0; idx<nhandles; idx++) {
-        if (msg->easy_handle == currhandle) break;
-        else if(msg->easy_handle == bakkhandle) break;
-      }
- 
-      switch(idx) {
-      case 0:
-        curl_rc = msg->data.result;
-        break;
-      case 1:
-        curl_rc = msg->data.result;
-        break;
-      }
-    }
-  }
-
-  /* we start some action by calling perform right away */
-  curl_multi_remove_handle(multi_handle, currhandle);
-  if(nhandles==2){
-        curl_multi_remove_handle(multi_handle, bakkhandle);
-  }
-
-  EVEL_DEBUG("Transfer completed with status %s\n", curl_multi_strerror(curl_rc));
-  if( curl_rc == 0 || curl_rc == 55 )
-     return EVEL_SUCCESS;
-  else
-     return EVEL_CURL_LIBRARY_FAIL;
-
-}
 /**************************************************************************//**
  * Event Handler.
  *
@@ -1515,7 +1102,7 @@ static int evel_post_multiapi(char *jsonmsg, size_t size,CURL *currhandle, char
  *
  * param[in]  arg  Argument - unused.
  *****************************************************************************/
-static void * event_multi_handler(void * arg __attribute__ ((unused)))
+static void * event_handler(void * arg __attribute__ ((unused)))
 {
   int old_type = 0;
   EVENT_HEADER * msg = NULL;
@@ -1524,12 +1111,10 @@ static void * event_multi_handler(void * arg __attribute__ ((unused)))
   char json_body[EVEL_MAX_JSON_BODY];
   int rc = EVEL_SUCCESS;
   CURLcode curl_rc;
-  CURL *currhandler = NULL;
-  CURL *bakhandler = NULL;
-  char *send_url = NULL;
-  char *send_url2 = NULL;
+  int collector_down_count = 0;
+  int switch_coll = 0;
 
-  EVEL_INFO("Event multi handler thread started");
+  EVEL_INFO("Event handler thread started");
 
   /***************************************************************************/
   /* Set this thread to be cancellable immediately.                          */
@@ -1551,12 +1136,12 @@ static void * event_multi_handler(void * arg __attribute__ ((unused)))
                "Handler will exit immediately!");
   }
 
-  currhandler = curl_handle;
   while (evt_handler_state == EVT_HANDLER_ACTIVE)
   {
     /*************************************************************************/
     /* Wait for a message to be received.                                    */
     /*************************************************************************/
+    EVEL_DEBUG("Event handler getting any messages");
     msg = ring_buffer_read(&event_buffer);
 
     /*************************************************************************/
@@ -1573,231 +1158,62 @@ static void * event_multi_handler(void * arg __attribute__ ((unused)))
       json_size = evel_json_encode_batch_event(json_body, EVEL_MAX_JSON_BODY, msg);
 
       /***************************************************************************/
-      /* Set the URL for the API.                                                */
+      /* Set the connection to collector                                         */
       /***************************************************************************/
-      if( currhandler == curl_handle){
-         send_url = evel_batch_api_url;
-         send_url2 = evel_bbatch_api_url;
-         bakhandler = curl_handle2;
-      } else if(currhandler == curl_handle2) {
-         send_url = evel_bbatch_api_url;
-         send_url2 = evel_batch_api_url;
-         bakhandler = curl_handle;
-      }
-
-      /***********************************************************************/
-      /* Send the JSON across the API.                                       */
-      /***********************************************************************/
-      EVEL_DEBUG("Sending Batch JSON of size %d is: %s", json_size, json_body);
-      rc = evel_post_multiapi(json_body, json_size, currhandler, send_url, bakhandler, send_url2);
-      if (rc != EVEL_SUCCESS)
+      while (true)
       {
-        EVEL_ERROR("Failed to transfer the data to %s. Error code=%d", send_url, rc);
-        EVEL_INFO("Switched Collector ...");
-        if( currhandler == curl_handle){
-	  currhandler = curl_handle2;
-          bakhandler = curl_handle;
-        } else if(currhandler == curl_handle2) {
-	  currhandler = curl_handle;
-          bakhandler = curl_handle2;
-        }
-        rc = evel_post_multiapi(json_body, json_size, currhandler, send_url2, bakhandler,send_url);
-        if (rc != EVEL_SUCCESS)
-           EVEL_ERROR("Failed to transfer the data to failover %s. Error code=%d", send_url2, rc);
+         evel_collector_id =3;
+         rc = evel_setup_curl();
+
+         if ( rc != EVEL_SUCCESS)
+         {
+             EVEL_ERROR("Failed to setup the first collector. Error code=%d", rc);
+             if (curr_global_handles == 2)
+             {
+                EVEL_DEBUG("Switching to other collector");
+
+                evel_collector_id = 4;
+
+                rc = evel_setup_curl();
+                if ( rc != EVEL_SUCCESS)
+                {
+                   EVEL_ERROR("Failed to setup the connection to second collector also, Error code%d", rc);
+                   sleep(EVEL_COLLECTOR_RECONNECTION_WAIT_TIME);
+                   collector_down_count = collector_down_count + 1;
+                   EVEL_ERROR("Collectors setup issue- retry count=%d", collector_down_count);
+                }
+                else
+                {
+                   break;
+                   collector_down_count = 0;
+                }
+             }
+             else
+             {
+                sleep(EVEL_COLLECTOR_RECONNECTION_WAIT_TIME);
+                collector_down_count = collector_down_count + 1;
+                EVEL_ERROR("Collector setup issue-retry count=%d", collector_down_count);
+             }
+         }
+         else
+         {
+            break;
+            collector_down_count = 0;
+         }
       }
-    }
-    else if (msg->event_domain != EVEL_DOMAIN_INTERNAL )
-    {
-      EVEL_DEBUG("External event received");
-
-      /***********************************************************************/
-      /* Encode the event in JSON.                                           */
-      /***********************************************************************/
-      json_size = evel_json_encode_event(json_body, EVEL_MAX_JSON_BODY, msg);
 
       /***************************************************************************/
       /* Set the URL for the API.                                                */
       /***************************************************************************/
-      if( currhandler == curl_handle){
-         send_url = evel_event_api_url;
-         send_url2 = evel_bevent_api_url;
-         bakhandler = curl_handle2;
-      } else if(currhandler == curl_handle2) {
-         send_url = evel_bevent_api_url;
-         send_url2 = evel_event_api_url;
-         bakhandler = curl_handle;
-      }
-
-      /***********************************************************************/
-      /* Send the JSON across the API.                                       */
-      /***********************************************************************/
-      EVEL_DEBUG("Sending Batch JSON of size %d is: %s", json_size, json_body);
-      rc = evel_post_multiapi(json_body, json_size, currhandler, send_url, bakhandler, send_url2);
-      if (rc != EVEL_SUCCESS)
-      {
-        EVEL_ERROR("Failed to transfer the data to %s. Error code=%d", send_url, rc);
-        EVEL_INFO("Switched Collector ...");
-        if( currhandler == curl_handle){
-          currhandler = curl_handle2;
-          bakhandler = curl_handle;
-        } else if(currhandler == curl_handle2) {
-          currhandler = curl_handle;
-          bakhandler = curl_handle2;
-        }
-        rc = evel_post_multiapi(json_body, json_size, currhandler, send_url2, bakhandler,send_url);
-        if (rc != EVEL_SUCCESS)
-           EVEL_ERROR("Failed to transfer the data to failover %s. Error code=%d", send_url2, rc);
-      }
-
-    }
-    else
-    {
-      EVEL_DEBUG("Internal event received");
-      internal_msg = (EVENT_INTERNAL *) msg;
-      assert(internal_msg->command == EVT_CMD_TERMINATE);
-      evt_handler_state = EVT_HANDLER_TERMINATING;
-    }
-
-    /*************************************************************************/
-    /* We are responsible for freeing the memory.                            */
-    /*************************************************************************/
-    evel_free_event(msg);
-    msg = NULL;
-
-    /*************************************************************************/
-    /* There may be a single priority post to be sent.                       */
-    /*************************************************************************/
-    if (priority_post.memory != NULL)
-    {
-      EVEL_DEBUG("Priority Post");
-
-      /***********************************************************************/
-      /* Set the URL for the throttling API.                                 */
-      /***********************************************************************/
-      curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, evel_throt_api_url);
-      if (curl_rc != CURLE_OK)
+      if (evel_collector_id == 3)
       {
-        /*********************************************************************/
-        /* This is only likely to happen with CURLE_OUT_OF_MEMORY, in which  */
-        /* case we carry on regardless.                                      */
-        /*********************************************************************/
-        EVEL_ERROR("Failed to set throttling URL. Error code=%d", rc);
+         curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, evel_batch_api_url);
       }
       else
       {
-        rc = evel_post_api(priority_post.memory, priority_post.size);
-        if (rc != EVEL_SUCCESS)
-        {
-          EVEL_ERROR("Failed to transfer priority post. Error code=%d", rc);
-        }
+         curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, evel_bbatch_api_url);
       }
 
-      /***********************************************************************/
-      /* Reinstate the URL for the event API.                                */
-      /***********************************************************************/
-      curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, evel_event_api_url);
-      if (curl_rc != CURLE_OK)
-      {
-        /*********************************************************************/
-        /* This is only likely to happen with CURLE_OUT_OF_MEMORY, in which  */
-        /* case we carry on regardless.                                      */
-        /*********************************************************************/
-        EVEL_ERROR("Failed to reinstate events URL. Error code=%d", rc);
-      }
-
-      /***********************************************************************/
-      /* We are responsible for freeing the memory.                          */
-      /***********************************************************************/
-      free(priority_post.memory);
-      priority_post.memory = NULL;
-    }
-  }
-
-  /***************************************************************************/
-  /* The event handler is now exiting. The ring-buffer could contain events  */
-  /* which have not been processed, so deplete those.  Because we've been    */
-  /* asked to exit we can be confident that the foreground will have stopped */
-  /* sending events in so we know that this process will conclude!           */
-  /***************************************************************************/
-  evt_handler_state = EVT_HANDLER_TERMINATING;
-  while (!ring_buffer_is_empty(&event_buffer))
-  {
-    EVEL_DEBUG("Reading event from buffer");
-    msg = ring_buffer_read(&event_buffer);
-    evel_free_event(msg);
-  }
-  evt_handler_state = EVT_HANDLER_TERMINATED;
-  EVEL_INFO("Event handler thread stopped");
-
-  return (NULL);
-}
-
-
-/**************************************************************************//**
- * Event Handler.
- *
- * Watch for messages coming on the internal queue and send them to the
- * listener.
- *
- * param[in]  arg  Argument - unused.
- *****************************************************************************/
-static void * event_handler(void * arg __attribute__ ((unused)))
-{
-  int old_type = 0;
-  EVENT_HEADER * msg = NULL;
-  EVENT_INTERNAL * internal_msg = NULL;
-  int json_size = 0;
-  char json_body[EVEL_MAX_JSON_BODY];
-  int rc = EVEL_SUCCESS;
-  CURLcode curl_rc;
-
-  EVEL_INFO("Event handler thread started");
-
-  /***************************************************************************/
-  /* Set this thread to be cancellable immediately.                          */
-  /***************************************************************************/
-  pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &old_type);
-
-  /***************************************************************************/
-  /* Set the handler as active, defending against weird situations like      */
-  /* immediately shutting down after initializing the library so the         */
-  /* handler never gets started up properly.                                 */
-  /***************************************************************************/
-  if (evt_handler_state == EVT_HANDLER_INACTIVE)
-  {
-    evt_handler_state = EVT_HANDLER_ACTIVE;
-  }
-  else
-  {
-    EVEL_ERROR("Event Handler State was not INACTIVE at start-up - "
-               "Handler will exit immediately!");
-  }
-
-  while (evt_handler_state == EVT_HANDLER_ACTIVE)
-  {
-    /*************************************************************************/
-    /* Wait for a message to be received.                                    */
-    /*************************************************************************/
-    EVEL_DEBUG("Event handler getting any messages");
-    msg = ring_buffer_read(&event_buffer);
-
-    /*************************************************************************/
-    /* Internal events get special treatment while regular events get posted */
-    /* to the far side.                                                      */
-    /*************************************************************************/
-    if (msg->event_domain == EVEL_DOMAIN_BATCH )
-    {
-      EVEL_DEBUG("Batch event received");
-
-      /***********************************************************************/
-      /* Encode the event in JSON.                                           */
-      /***********************************************************************/
-      json_size = evel_json_encode_batch_event(json_body, EVEL_MAX_JSON_BODY, msg);
-
-      /***************************************************************************/
-      /* Set the URL for the API.                                                */
-      /***************************************************************************/
-      curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, evel_batch_api_url);
       if (curl_rc != CURLE_OK)
       {
         rc = EVEL_CURL_LIBRARY_FAIL;
@@ -1810,9 +1226,64 @@ static void * event_handler(void * arg __attribute__ ((unused)))
       /***********************************************************************/
       EVEL_DEBUG("Sending Batch JSON of size %d is: %s", json_size, json_body);
       rc = evel_post_api(json_body, json_size);
-      if (rc != EVEL_SUCCESS)
+
+      switch_coll = 0;
+      if ((rc == EVEL_SUCCESS) && ((http_response_code / 100) != 2))
       {
-        EVEL_ERROR("Failed to transfer the data %s. Error code=%d", evel_batch_api_url, rc);
+         switch_coll = 1;
+         if (http_response_code == 400) // 400 - Bad JSON related return code
+            switch_coll = 0;
+      }
+
+      if ((rc != EVEL_SUCCESS)  || (switch_coll == 1))
+      {
+        EVEL_ERROR("Failed to transfer the data. Error code=%d", rc);
+        EVEL_DEBUG("Switching to other collector if any");
+
+        while (true)
+        {
+           if ((evel_collector_id == 3) && (curr_global_handles == 2))
+           {
+             evel_collector_id =4;
+           }
+           else if (evel_collector_id == 4)
+           {
+             evel_collector_id =3;
+           }
+
+           rc = evel_setup_curl();
+
+           if ( rc != EVEL_SUCCESS)
+           {
+             sleep(EVEL_COLLECTOR_RECONNECTION_WAIT_TIME);
+             collector_down_count = collector_down_count + 1;
+             EVEL_ERROR("Collector setup issue-retry count=%d", collector_down_count);
+             continue;
+           }
+
+           if (evel_collector_id == 3)
+           {
+              curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, evel_batch_api_url);
+           }
+           else if (evel_collector_id == 4)
+           {
+              curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, evel_bbatch_api_url);
+           }
+
+           rc = evel_post_api(json_body, json_size);
+           if ( rc != EVEL_SUCCESS)
+           {
+              sleep(EVEL_COLLECTOR_RECONNECTION_WAIT_TIME);
+              collector_down_count = collector_down_count + 1;
+              EVEL_ERROR("Collector setup issue-retry count=%d", collector_down_count);
+              continue;
+           }
+           else
+           {
+              EVEL_DEBUG("Successfully sent msg after retry=%d", collector_down_count);
+              break;
+           }
+        }
       }
     }
     else if (msg->event_domain != EVEL_DOMAIN_INTERNAL )
@@ -1825,9 +1296,57 @@ static void * event_handler(void * arg __attribute__ ((unused)))
       json_size = evel_json_encode_event(json_body, EVEL_MAX_JSON_BODY, msg);
 
       /***************************************************************************/
+      /* Set the connection to collector                                         */
+      /***************************************************************************/
+      while (true)
+      {
+         evel_collector_id = 1;
+         rc = evel_setup_curl();
+
+         if ( rc != EVEL_SUCCESS)
+         {
+             EVEL_ERROR("Failed to setup the first collector. Error code=%d", rc);
+             if (curr_global_handles == 2)
+             {
+                EVEL_DEBUG("Switching to other collector");
+
+                evel_collector_id = 2;
+
+                rc = evel_setup_curl();
+                if ( rc != EVEL_SUCCESS)
+                {
+                   EVEL_ERROR("Failed to setup the connection to second collector also, Error code%d", rc);
+                   sleep(EVEL_COLLECTOR_RECONNECTION_WAIT_TIME);
+                   collector_down_count = collector_down_count + 1;
+                   EVEL_ERROR("Collectors setup issue- retry count=%d", collector_down_count);
+                }
+                else
+                {
+                   break;
+                   collector_down_count = 0;
+                }
+             }
+             else
+             {
+                sleep(EVEL_COLLECTOR_RECONNECTION_WAIT_TIME);
+                collector_down_count = collector_down_count + 1;
+                EVEL_ERROR("Collector setup issue-retry count=%d", collector_down_count);
+             }
+         }
+         else
+         {
+            break;
+            collector_down_count = 0;
+         }
+      }
+      /***************************************************************************/
       /* Set the URL for the API.                                                */
       /***************************************************************************/
-      curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, evel_event_api_url);
+      if (evel_collector_id == 1)
+         curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, evel_event_api_url);
+      else
+         curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, evel_bevent_api_url);
+
       if (curl_rc != CURLE_OK)
       {
         rc = EVEL_CURL_LIBRARY_FAIL;
@@ -1840,9 +1359,64 @@ static void * event_handler(void * arg __attribute__ ((unused)))
       /***********************************************************************/
       EVEL_DEBUG("Sending JSON of size %d is: %s", json_size, json_body);
       rc = evel_post_api(json_body, json_size);
-      if (rc != EVEL_SUCCESS)
+
+      switch_coll = 0;
+      if ((rc == EVEL_SUCCESS) && ((http_response_code / 100) != 2))
+      {
+         switch_coll = 1;
+         if (http_response_code == 400) // 400 - Bad JSON related return code
+            switch_coll = 0;
+      }
+
+      if ((rc != EVEL_SUCCESS)  || (switch_coll == 1))
       {
-        EVEL_ERROR("Failed to transfer the data %s. Error code=%d",evel_event_api_url, rc);
+        EVEL_ERROR("Failed to transfer the data. Error code=%d", rc);
+        EVEL_DEBUG("Switching to other collector if any");
+
+        while (true)
+        {
+           if ((evel_collector_id == 1) && (curr_global_handles == 2))
+           {
+             evel_collector_id =2;
+           }
+           else if (evel_collector_id == 2)
+           {
+             evel_collector_id =1;
+           }
+
+           rc = evel_setup_curl();
+
+           if ( rc != EVEL_SUCCESS)
+           {
+             sleep(EVEL_COLLECTOR_RECONNECTION_WAIT_TIME);
+             collector_down_count = collector_down_count + 1;
+             EVEL_ERROR("Collector setup issue-retry count=%d", collector_down_count);
+             continue;
+           }
+
+           if (evel_collector_id == 1)
+           {
+              curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, evel_event_api_url);
+           }
+           else if (evel_collector_id == 2)
+           {
+              curl_rc = curl_easy_setopt(curl_handle, CURLOPT_URL, evel_bevent_api_url);
+           }
+
+           rc = evel_post_api(json_body, json_size);
+           if ( rc != EVEL_SUCCESS)
+           {
+              sleep(EVEL_COLLECTOR_RECONNECTION_WAIT_TIME);
+              collector_down_count = collector_down_count + 1;
+              EVEL_ERROR("Collector setup issue-retry count=%d", collector_down_count);
+              continue;
+           }
+           else
+           {
+              EVEL_DEBUG("Successfully sent msg after retry=%d", collector_down_count);
+              break;
+           }
+        }
       }
     }
     else
@@ -1974,11 +1548,11 @@ void evel_handle_event_response(const MEMORY_CHUNK * const chunk,
   }
   else
   {
-    //EVEL_DEBUG("Decode JSON response tokens");
-    //if (!evel_handle_response_tokens(chunk, json_tokens, num_tokens, post))
-    //{
-    //  EVEL_ERROR("Failed to handle JSON response.");
-    //}
+    EVEL_DEBUG("Decode JSON response tokens");
+    if (!evel_handle_response_tokens(chunk, json_tokens, num_tokens, post))
+    {
+      EVEL_ERROR("Failed to handle JSON response.");
+    }
   }
 
   EVEL_EXIT();
@@ -1998,7 +1572,7 @@ bool evel_handle_response_tokens(const MEMORY_CHUNK * const chunk,
                                  const int num_tokens,
                                  MEMORY_CHUNK * const post)
 {
-  bool json_ok = false;
+  bool json_ok = true;
 
   EVEL_ENTER();
 
diff --git a/vnfs/VES5.0/evel/evel-library/code/evel_library/evel_internal.h b/vnfs/VES5.0/evel/evel-library/code/evel_library/evel_internal.h
index 621f8a53..14d224d4 100644
--- a/vnfs/VES5.0/evel/evel-library/code/evel_library/evel_internal.h
+++ b/vnfs/VES5.0/evel/evel-library/code/evel_library/evel_internal.h
@@ -201,7 +201,6 @@ EVEL_ERR_CODES event_handler_initialize(const char * const event_api_url,
                                         const char * const bakup_source_ip,
                                         int ring_buf_size,
                                         int secure,
-                                        int activitymode,
                                         const char * const cert_file_path,
                                         const char * const key_file_path,
                                         const char * const ca_info,
diff --git a/vnfs/VES5.0/evel/evel-library/code/evel_library/readme.md b/vnfs/VES5.0/evel/evel-library/code/evel_library/readme.md
index 3cf57083..2033cfc9 100644
--- a/vnfs/VES5.0/evel/evel-library/code/evel_library/readme.md
+++ b/vnfs/VES5.0/evel/evel-library/code/evel_library/readme.md
@@ -76,17 +76,30 @@ The following fragment illustrates the above usage:
 
 ```C
 
-  if (evel_initialize(api_fqdn,
-                      api_port,
-                      api_path,
-                      api_topic,
-                      api_secure,
-                      "Alice",
-                      "This isn't very secure!",
-                      EVEL_SOURCE_VIRTUAL_MACHINE,
-                      "EVEL demo client",
-                      verbose_mode))
-  {
+EVEL_ERR_CODES evel_initialize(const char * const fqdn,
+                               int port,
+                               const char * const bakup_fqdn,
+                               int bakup_port,
+                               const char * const path,
+                               const char * const topic,
+                               int ring_buf_size,
+                               int secure,
+                               const char * const cert_file_path,
+                               const char * const key_file_path,
+                               const char * const ca_info,
+                               const char * const ca_file_path,
+                               long verify_peer,
+                               long verify_host,
+                               const char * const username,
+                               const char * const password,
+                               const char * const bakup_username,
+                               const char * const bakup_password,
+                               const char * const source_ip,
+                               const char * const bakup_source_ip,
+                               EVEL_SOURCE_TYPES source_type,
+                               const char * const role,
+                               int verbosity
+                               )  {
     fprintf(stderr, "Failed to initialize the EVEL library!!!");
     exit(-1);
   }