update

src/NATSBridge.js

@@ -460,8 +460,9 @@ async function smartsend(subject, data, options = {}) {
      * @param {string} options.receiverId - UUID of the receiver (default: "")
      * @param {string} options.replyTo - Topic to reply to (default: "")
      * @param {string} options.replyToMsgId - Message ID this message is replying to (default: "")
+     * @param {boolean} options.isPublish - Whether to automatically publish the message to NATS (default: true)
      * 
-     * @returns {Promise<MessageEnvelope>} - The envelope for tracking
+     * @returns {Promise<Object>} - An object with { env: MessageEnvelope, msg_json_str: string }
      */
     const {
         natsUrl = DEFAULT_NATS_URL,
@@ -474,7 +475,8 @@ async function smartsend(subject, data, options = {}) {
         receiverName = "",
         receiverId = "",
         replyTo = "",
-        replyToMsgId = ""
+        replyToMsgId = "",
+        isPublish = true  // Whether to automatically publish the message to NATS
     } = options;
     
     log_trace(correlationId, `Starting smartsend for subject: ${subject}`);
@@ -556,10 +558,19 @@ async function smartsend(subject, data, options = {}) {
         payloads: payloads
     });
     
-    // Publish message to NATS
-    await publish_message(natsUrl, subject, env.toString(), correlationId);
+    // Convert envelope to JSON string
+    const msg_json_str = env.toString();
     
-    return env;
+    // Publish to NATS if isPublish is true
+    if (isPublish) {
+        await publish_message(natsUrl, subject, msg_json_str, correlationId);
+    }
+    
+    // Return both envelope and JSON string (tuple-like structure)
+    return {
+        env: env,
+        msg_json_str: msg_json_str
+    };
 }
 
 // Helper: Publish message to NATS