From 250a838b921957ab8fe9ad2386d964641c25913b Mon Sep 17 00:00:00 2001
From: "Dustin C. Hatch" <dustin@hatch.name>
Date: Sun, 14 Aug 2022 20:40:25 -0500
Subject: [PATCH] mqttdpms: Retain online availability message

The *online* message sent to the availability topic needs to have the
retained flag set.  Without it, when Home Assistant restarts, it will
receive the retained *offline* message and mark the entity as
unavailable.
---
 src/mqttdpms.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mqttdpms.rs b/src/mqttdpms.rs
index c4615ba..30620ae 100644
--- a/src/mqttdpms.rs
+++ b/src/mqttdpms.rs
@@ -170,7 +170,7 @@ impl MqttDpms {
             .topics
             .availability
             .replace("@UNIQUEID@", &self.config.unique_id);
-        let message = mqtt::Message::new(topic, "online", 0);
+        let message = mqtt::Message::new_retained(topic, "online", 0);
         Ok(client.publish(message).await?)
     }