keep memory of the last string in the queue

qjs_wrapper.c

@@ -270,6 +270,26 @@ static JSValue readDroneDataStr(JSContext *ctx, StrQueue *pQueue)
     JSValue res;
     struct strNode *current;
 
+    current = pQueue->head;
+    if (current != NULL) {
+        res = JS_NewString(ctx, current->str);
+        if (current->next != NULL) {
+            pQueue->head = current->next;
+            delete_str_node(current);
+        } else {
+            pQueue->tail = NULL;
+        }
+    } else {
+        res = JS_NewString(ctx, "");
+    }
+    return res;
+}
+
+static JSValue readDroneDataStrOnce(JSContext *ctx, StrQueue *pQueue)
+{
+    JSValue res;
+    struct strNode *current;
+
     current = pQueue->head;
     if (current != NULL) {
         res = JS_NewString(ctx, current->str);
@@ -306,7 +326,7 @@ static JSValue js_drone_get(JSContext *ctx, JSValueConst thisVal, int magic)
         case 8:
             return readDroneDataStr(ctx, &(s->receiveMessageQueue));
         case 9:
-            return readDroneDataStr(ctx, &(s->receiveLogQueue));
+            return readDroneDataStrOnce(ctx, &(s->receiveLogQueue));
         case 10:
             return JS_NewInt64(ctx, s->timestamp);
         default: