1. Make REST API Calls from atvise (Using HTTPClient Class)

In atvise SCADA, REST API calls can be performed using the HTTPClient class (not just a function). This class allows you to send HTTP requests (GET, POST, etc.) directly from atvise to external systems, making it possible to integrate with databases, third-party applications, or other services.

This article provides practical examples of:

• A GET request with basic authentication and JSON parsing.
• A POST request with basic authentication to write data.

By the end, you will know how to use new HTTPClient() to build secure and effective REST integrations in atvise.

1. Example to make a GET method call using BASIC authentication and parsing a JSON format reply from the REST Server.
   
   

   // Create an HTTPClient instance (class, not just a function)
   var http = new HTTPClient();
   
   // Execute a GET request with basic authentication
   var response = http.get(
       "http://localhost:3003/tag?cmd=read&path=/*",
       {
           auth: {
               method: "basic",
               user: "vnode",
               password: "vnode"
           }
       }
   );
   
   // --- Parse JSON response ---
   // Example response: {"data":{"value":1234}, "status":"ok"}
   
   // Define the search pattern
   var pattern = "\"data\":{\"value\":";
   
   // Find the index where the pattern starts
   var startIndex = response.data.search(pattern);
   
   // Find the next comma after the pattern
   var endIndex = (response.data.slice(startIndex)).search(",");
   
   // Extract only the clean value from the response
   var cleanValue = response.data.slice(
       startIndex + pattern.length,
       startIndex + endIndex
   );
   
   // Print to console for debugging
   console.log("Extracted Value:", cleanValue);
   
   // Return the extracted value
   return cleanValue;

2. Example to make a POST method using BASIC authentication.
   
   

   // Create an HTTPClient instance (class, not just a function)
   var http = new HTTPClient();
   
   // Execute a POST request with basic authentication
   var response = http.request({
       protocol: "http",
       hostname: "localhost",
       port: 3003,
       path: "/tag?cmd=write",
       method: "POST",
   
       // Data to be sent in JSON format
       data: JSON.stringify({
           "path": "/prueba",     // Tag or node path
           "value": writevalue    // Value to be written
       }),
   
       // Basic authentication credentials
       auth: {
           method: "basic",
           user: "vnode",
           password: "vnode"
       }
   });
   
   // Print server response for debugging
   console.log("POST Response:", response);
   
   // Return the server response
   return response;