publish cleanup config on OTA updates

gateway/include/ha.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <ArduinoJson.h>
+#include "utils.h"
 
 #define JSON_SIZE   512
 #define TOPIC_SIZE  255
@@ -14,9 +15,11 @@ namespace Ha {
         char* id;
         const char* type;
         char configTopic[TOPIC_SIZE];
+        static List<Component> configs;
 
         Component(const char* name, const char* id, const char* type) : name(name), id((char*)id), type(type) {
             sprintf(configTopic, "homeassistant/%s/rc-gateway/%s/config", type, id);
+            configs.add(this);
         }
 
         virtual void buildUniqueId(char* uniqueId) = 0;
@@ -42,6 +45,7 @@ namespace Ha {
             identifiers.add(DEVICE_ID);
         }
     };
+    List<Component> Component::configs;
 
     struct Command : Component {
         char commandTopic[TOPIC_SIZE];

gateway/include/mqtt.h

@@ -81,6 +81,12 @@ namespace Mqtt {
         ts.deleteTask(tPublishInit);
     }
 
+    void publishCleanupConfig() {
+        for (List<Ha::Component>::Container* c = Ha::Component::configs.first; c; c = c->next) {
+            publish(c->t->configTopic, "");
+        }
+    }
+
     void publishBme280() {
         // StaticJsonDocument<255> jsonDoc;
         // jsonDoc["temperature"] = Bme::data.temp;

gateway/include/ota.h

@@ -11,6 +11,7 @@ namespace  Ota {
 	void setup() {
 		ArduinoOTA.onStart([]() {
 			Serial.println("Starting OTA");
+			Mqtt::publishCleanupConfig();
 			Mqtt::disconnect();
 			});
 		ArduinoOTA.onEnd([]() {

gateway/include/utils.h

@@ -0,0 +1,20 @@
+#pragma once
+
+template <class T>
+struct List {
+    struct Container {
+        T* t;
+        Container* next;
+        Container(T* t) : t(t) {}
+    };
+
+    Container* first;
+    Container* last;
+
+    void add(T* t) {
+        Container* c = new Container{t};
+        first == nullptr ? first = c : last->next = c;
+        last = c;
+    }
+
+};