Do not report error when receiving DNET signals

lingua-franca-ref.txt

@@ -1 +1 @@
-master
+rti-DNET

src/core/federation.ts

@@ -247,6 +247,18 @@ enum RTIMessageTypes {
    */
   MSG_TYPE_NEIGHBOR_STRUCTURE = 24,
 
+  /**
+   * Byte identifying a downstream next event tag (DNET) message sent
+   * from the RTI in centralized coordination.
+   * The next eight bytes will be the timestamp.
+   * The next four bytes will be the microstep.
+   * This signal from the RTI tells the destination federate the latest tag that
+   * the federate can safely skip sending a next event tag (NET) signal.
+   * In other words, the federate doesn't have to send NET signals with tags
+   * earlier than or equal to this tag unless it cannot advance to its next event tag.
+   */
+  MSG_TYPE_DOWNSTREAM_NEXT_EVENT_TAG = 26,
+
   /**
    * Byte identifying an acknowledgment of the previously received MSG_TYPE_FED_IDS message
    * sent by the RTI to the federate
@@ -1155,6 +1167,20 @@ class RTIClient extends EventEmitter {
           bufferIndex += 17;
           break;
         }
+        case RTIMessageTypes.MSG_TYPE_DOWNSTREAM_NEXT_EVENT_TAG: {
+          // The next eight bytes are the timestamp.
+          // The next four bytes are the microstep.
+          const tagBuffer = Buffer.alloc(12);
+          assembledData.copy(tagBuffer, 0, bufferIndex + 1, bufferIndex + 13);
+          const tag = Tag.fromBinary(tagBuffer);
+
+          Log.debug(this, () => {
+            return `Downstream next event tag (DNET) received from RTI for ${tag}.
+              DNET is not yet supported in TypeScript. Ignored.`;
+          });
+          bufferIndex += 13;
+          break;
+        }
         case RTIMessageTypes.MSG_TYPE_ACK: {
           Log.debug(this, () => {
             return "Received an RTI MSG_TYPE_ACK";