diff --git a/soti-nucleo-project/App/Src/app.c b/soti-nucleo-project/App/Src/app.c
index 90b92fc..c22139f 100644
--- a/soti-nucleo-project/App/Src/app.c
+++ b/soti-nucleo-project/App/Src/app.c
@@ -132,6 +132,7 @@ void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
 		CANMessage msg = {
 				.cmd = CMD_CDH_PROCESS_TELEMETRY_REPORT
 		};
+
 		osMessageQueuePut(s_output_queue, &msg, 0U, 0U);
 	}
 }
diff --git a/soti/screens/main_screen.py b/soti/screens/main_screen.py
index 8568d00..e217f16 100644
--- a/soti/screens/main_screen.py
+++ b/soti/screens/main_screen.py
@@ -117,7 +117,12 @@ def _on_command_entered(self, text: str):
 
     def _on_message_received(self, msg: Message):
         """Called when a new message arrives."""
-        transaction = f"{str(msg.sender.name)} → {str(msg.recipient.name)} : {str(msg.cmd.name)}"
+        # Distinguish ack messages.
+        if(msg.is_ack):
+            transaction = f"{str(msg.recipient.name)} ← {str(msg.sender.name)} : {str(msg.cmd.name)}"
+        else:
+            transaction = f"{str(msg.sender.name)} → {str(msg.recipient.name)} : {str(msg.cmd.name)}"
+
         body_contents = parse_msg_body(msg.cmd, msg.body)
         arguments = ""
         for key, value in body_contents.items():