diff --git a/src/Homie.cpp b/src/Homie.cpp
index 70951c92..ec9e4313 100644
--- a/src/Homie.cpp
+++ b/src/Homie.cpp
@@ -117,7 +117,7 @@ void HomieClass::setBrand(const char* name) {
   strcpy(this->_interface.brand, name);
 }
 
-void HomieClass::registerNode(HomieNode& node) {
+void HomieClass::registerNode(const HomieNode& node) {
   this->_checkBeforeSetup(F("registerNode"));
   if (this->_interface.registeredNodesCount > MAX_REGISTERED_NODES_COUNT) {
     Serial.println(F("✖ register(): the max registered nodes count has been reached"));
@@ -180,7 +180,7 @@ void HomieClass::disableResetTrigger() {
   this->_interface.reset.enabled = false;
 }
 
-bool HomieClass::setNodeProperty(HomieNode& node, const char* property, const char* value, bool retained) {
+bool HomieClass::setNodeProperty(const HomieNode& node, const char* property, const char* value, bool retained) {
   if (!this->isReadyToOperate()) {
     Logger.logln(F("✖ setNodeProperty(): impossible now"));
     return false;
diff --git a/src/Homie.h b/src/Homie.h
index 7bcfefff..337de799 100644
--- a/src/Homie.h
+++ b/src/Homie.h
@@ -26,7 +26,7 @@ namespace HomieInternals {
       void setLedPin(unsigned char pin, unsigned char on);
       void setBrand(const char* name);
       void setFirmware(const char* name, const char* version);
-      void registerNode(HomieNode& node);
+      void registerNode(const HomieNode& node);
       void setGlobalInputHandler(GlobalInputHandler globalInputHandler);
       void setResettable(bool resettable);
       void onEvent(EventHandler handler);
@@ -36,10 +36,10 @@ namespace HomieInternals {
       void setSetupFunction(OperationFunction function);
       void setLoopFunction(OperationFunction function);
       bool isReadyToOperate();
-      bool setNodeProperty(HomieNode& node, const String& property, const String& value, bool retained = true) {
+      bool setNodeProperty(const HomieNode& node, const String& property, const String& value, bool retained = true) {
         return this->setNodeProperty(node, property.c_str(), value.c_str(), retained);
       }
-      bool setNodeProperty(HomieNode& node, const char* property, const char* value, bool retained = true);
+      bool setNodeProperty(const HomieNode& node, const char* property, const char* value, bool retained = true);
     private:
       bool _setup;
       Boot* _boot;
diff --git a/src/Homie/Boot/BootConfig.cpp b/src/Homie/Boot/BootConfig.cpp
index 6671db60..4311290a 100644
--- a/src/Homie/Boot/BootConfig.cpp
+++ b/src/Homie/Boot/BootConfig.cpp
@@ -127,7 +127,7 @@ void BootConfig::_onDeviceInfoRequest() {
   JsonArray& nodes = json.createNestedArray("nodes");
   for (int i = 0; i < this->_interface->registeredNodesCount; i++) {
     jsonLength += 20; // {"id":"","type":""},
-    HomieNode* node = this->_interface->registeredNodes[i];
+    const HomieNode* node = this->_interface->registeredNodes[i];
     JsonObject& jsonNode = jsonBuffer.createObject();
     jsonLength += strlen(node->getId());
     jsonNode["id"] = node->getId();
diff --git a/src/Homie/Boot/BootNormal.cpp b/src/Homie/Boot/BootNormal.cpp
index d834c332..93e3b4d8 100644
--- a/src/Homie/Boot/BootNormal.cpp
+++ b/src/Homie/Boot/BootNormal.cpp
@@ -133,7 +133,7 @@ void BootNormal::_mqttSetup() {
   char nodes[MAX_REGISTERED_NODES_COUNT * (MAX_NODE_ID_LENGTH + 1 + MAX_NODE_ID_LENGTH + 1) - 1];
   strcpy_P(nodes, PSTR(""));
   for (int i = 0; i < this->_interface->registeredNodesCount; i++) {
-    HomieNode* node = this->_interface->registeredNodes[i];
+    const HomieNode* node = this->_interface->registeredNodes[i];
     strcat(nodes, node->getId());
     strcat_P(nodes, PSTR(":"));
     strcat(nodes, node->getType());
@@ -227,7 +227,7 @@ void BootNormal::_mqttCallback(char* topic, char* payload) {
 
   int homieNodeIndex = -1;
   for (int i = 0; i < this->_interface->registeredNodesCount; i++) {
-    HomieNode* homieNode = this->_interface->registeredNodes[i];
+    const HomieNode* homieNode = this->_interface->registeredNodes[i];
     if (node == homieNode->getId()) {
       homieNodeIndex = i;
       break;
@@ -241,7 +241,7 @@ void BootNormal::_mqttCallback(char* topic, char* payload) {
     return;
   }
 
-  HomieNode* homieNode = this->_interface->registeredNodes[homieNodeIndex];
+  const HomieNode* homieNode = this->_interface->registeredNodes[homieNodeIndex];
 
   int homieNodePropertyIndex = -1;
   for (int i = 0; i < homieNode->getSubscriptionsCount(); i++) {
diff --git a/src/Homie/Datatypes/Interface.hpp b/src/Homie/Datatypes/Interface.hpp
index e06a4af3..5bf2612f 100644
--- a/src/Homie/Datatypes/Interface.hpp
+++ b/src/Homie/Datatypes/Interface.hpp
@@ -30,7 +30,7 @@ namespace HomieInternals {
       ResetFunction userFunction;
     } reset;
 
-    HomieNode* registeredNodes[MAX_REGISTERED_NODES_COUNT];
+    const HomieNode* registeredNodes[MAX_REGISTERED_NODES_COUNT];
     unsigned char registeredNodesCount;
 
     GlobalInputHandler globalInputHandler;
diff --git a/src/HomieNode.cpp b/src/HomieNode.cpp
index 16f5559d..f38384b3 100644
--- a/src/HomieNode.cpp
+++ b/src/HomieNode.cpp
@@ -31,22 +31,22 @@ void HomieNode::subscribe(const char* property, PropertyInputHandler inputHandle
   this->_subscriptions[this->_subscriptionsCount++] = subscription;
 }
 
-const char* HomieNode::getId() {
+const char* HomieNode::getId() const {
   return this->_id;
 }
 
-const char* HomieNode::getType() {
+const char* HomieNode::getType() const {
   return this->_type;
 }
 
-Subscription* HomieNode::getSubscriptions() {
+const Subscription* HomieNode::getSubscriptions() const {
   return this->_subscriptions;
 }
 
-unsigned char HomieNode::getSubscriptionsCount() {
+unsigned char HomieNode::getSubscriptionsCount() const {
   return this->_subscriptionsCount;
 }
 
-NodeInputHandler HomieNode::getInputHandler() {
+NodeInputHandler HomieNode::getInputHandler() const {
   return this->_inputHandler;
 }
diff --git a/src/HomieNode.h b/src/HomieNode.h
index cc44ed60..944be569 100644
--- a/src/HomieNode.h
+++ b/src/HomieNode.h
@@ -22,11 +22,11 @@ class HomieNode {
     void subscribe(const char* property, HomieInternals::PropertyInputHandler inputHandler = [](String value) { return false; });
 
   private:
-    const char* getId();
-    const char* getType();
-    HomieInternals::Subscription* getSubscriptions();
-    unsigned char getSubscriptionsCount();
-    HomieInternals::NodeInputHandler getInputHandler();
+    const char* getId() const;
+    const char* getType() const;
+    const HomieInternals::Subscription* getSubscriptions() const;
+    unsigned char getSubscriptionsCount() const;
+    HomieInternals::NodeInputHandler getInputHandler() const;
 
     const char* _id;
     const char* _type;