New error code: Offline

Used to indicate absence of network connectivity

Relates-To: OCMAM-420
Signed-off-by: Andrey Kashcheev <ext-andrey.kashcheev@here.com>

Author: andrey-kashcheev

olp-cpp-sdk-core/include/olp/core/client/ApiError.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2019-2024 HERE Europe B.V.
+ * Copyright (C) 2019-2025 HERE Europe B.V.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -109,6 +109,18 @@ class CORE_API ApiError {
     return {ErrorCode::CacheIO, description};
   }
 
+  /**
+   * @brief Creates the `ApiError` instance with the offline error code and
+   * description.
+   *
+   * @param description The optional description.
+   *
+   * @return The `ApiError` instance.
+   */
+  static ApiError Offline(const char* description = "Offline") {
+    return {ErrorCode::Offline, description};
+  }
+
   /**
    * @brief Creates the `ApiError` instance with the unknown error code and
    * description.

olp-cpp-sdk-core/include/olp/core/client/ErrorCode.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2019-2024 HERE Europe B.V.
+ * Copyright (C) 2019-2025 HERE Europe B.V.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -96,6 +96,11 @@ enum class ErrorCode {
    * The device is full and cannot store more data.
    */
   NoSpaceLeft,
+
+  /**
+   * Absence of network connectivity.
+   */
+  Offline,
 };
 
 }  // namespace client

olp-cpp-sdk-core/include/olp/core/http/HttpStatusCode.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2019-2021 HERE Europe B.V.
+ * Copyright (C) 2019-2025 HERE Europe B.V.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -154,6 +154,7 @@ class CORE_API HttpStatusCode {
     if (http_code < 0) {
       switch (static_cast<olp::http::ErrorCode>(http_code)) {
         case olp::http::ErrorCode::OFFLINE_ERROR:
+          return olp::client::ErrorCode::Offline;
         case olp::http::ErrorCode::IO_ERROR:
           return olp::client::ErrorCode::NetworkConnection;
         case olp::http::ErrorCode::TIMEOUT_ERROR: