refactor(hmi_node.py): extract status_publisher_timer_period_sec vari…

…able for better readability and maintainability

refactor(tts_node.py): extract status_publisher_timer_period_sec variable for better readability and maintainability

src/rai_hmi/rai_hmi/hmi_node.py

@@ -81,8 +81,11 @@ def __init__(self):
             String, "to_human", 10, callback_group=self.callback_group
         )
 
+        status_publisher_timer_period_sec = 0.25
         self.create_timer(
-            0.25, self.status_callback, callback_group=self.callback_group
+            status_publisher_timer_period_sec,
+            self.status_callback,
+            callback_group=self.callback_group,
         )
 
         self.status_publisher = self.create_publisher(String, "hmi_status", 10)  # type: ignore

src/rai_tts/rai_tts/tts_node.py

@@ -53,7 +53,9 @@ def __init__(self):
         self.job_id: int = 0
         self.queued_job_id = 0
         self.tts_client = self._initialize_client()
-        self.create_timer(0.25, self.status_callback)
+
+        status_publisher_timer_period_sec = 0.25
+        self.create_timer(status_publisher_timer_period_sec, self.status_callback)
         threading.Thread(target=self._process_queue).start()
         self.get_logger().info("TTS Node has been started")  # type: ignore
         self.threads_number = 0