From c0c2001f9f481209f62e32a3b1f9eaa7e1932684 Mon Sep 17 00:00:00 2001
From: polyfloyd <floyd@polyfloyd.net>
Date: Wed, 20 Sep 2023 18:48:22 +0200
Subject: [PATCH] Do not relay retained messages on startup

---
 main.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/main.py b/main.py
index 9eb633b..bfc6bc8 100755
--- a/main.py
+++ b/main.py
@@ -104,12 +104,24 @@ def webhook_message(msg):
     webhook.execute()
 
 
+retained = {
+    'bitlair/photos',
+    'bitlair/state',
+    'bitlair/state/djo',
+}
+
 # post to mqtt discord channel when state changes
 def on_message(client, userdata, msg):
     try:
         topic = msg.topic
         msg = msg.payload.decode()
 
+        # Retained messages trigger an initial message on connecting. Prevent relaying them to
+        # Discord on startup.
+        if topic in retained:
+            retained.remove(topic)
+            return
+
         if topic == 'bitlair/state':
             webhook_message('Bitlair is now %s' % msg.upper())
         elif topic == 'bitlair/state/djo':