可用状态使用retained

.vscode/extensions.json

@@ -1,7 +1,7 @@
 {
-	// See http://go.microsoft.com/fwlink/?LinkId=827846
-	// for the documentation about the extensions.json format
-	"recommendations": [
-		"platformio.platformio-ide"
-	]
-}
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ]
+}

lib/esp_framework/src/Mqtt.cpp

@@ -31,7 +31,7 @@ bool Mqtt::mqttConnect()
     Debug::AddInfo(PSTR("client mqtt not connected, trying to connect to %s:%d Broker"), globalConfig.mqtt.server, globalConfig.mqtt.port);
     mqttClient.setServer(globalConfig.mqtt.server, globalConfig.mqtt.port);
 
-    if (mqttClient.connect(UID, globalConfig.mqtt.user, globalConfig.mqtt.pass, getTeleTopic(F("availability")).c_str(), 0, false, "offline"))
+    if (mqttClient.connect(UID, globalConfig.mqtt.user, globalConfig.mqtt.pass, getTeleTopic(F("availability")).c_str(), 0, true, "offline"))
     {
         Debug::AddInfo(PSTR("successful client mqtt connection"));
         if (connectedcallback != NULL)
@@ -58,7 +58,7 @@ void Mqtt::doReportHeartbeat()
 
 void Mqtt::availability()
 {
-    publish(getTeleTopic(F("availability")), "online", false);
+    publish(getTeleTopic(F("availability")), "online", true);
 }
 
 void Mqtt::perSecondDo()
@@ -99,7 +99,7 @@ void Mqtt::loop()
             {
                 doReportHeartbeat();
             }
-            if (perSecond % 309 == 0)
+            if (perSecond % 3609 == 0)
             {
                 availability();
             }

platformio.ini

@@ -51,7 +51,7 @@ extra_scripts             = scripts/strip-floats.py
 
 lib_deps =
   PubSubClient
-  Nanopb@0.3.9.2
+  Nanopb=https://github.com/nanopb/nanopb.git#nanopb-0.3.9.5
 
 [env:dc1]
 lib_deps    = ${env.lib_deps}