diff --git a/arduino/libraries/HeaterMeterClient/src/HeaterMeterClient.cpp b/arduino/libraries/HeaterMeterClient/src/HeaterMeterClient.cpp
index 589a7bcd..722f3bfa 100644
--- a/arduino/libraries/HeaterMeterClient/src/HeaterMeterClient.cpp
+++ b/arduino/libraries/HeaterMeterClient/src/HeaterMeterClient.cpp
@@ -44,11 +44,24 @@ void HeaterMeterClientProbe::clear(void)
   HasTemperatureDph = false;
 }
 
+void HeaterMeterClientPidInternals::clear(void)
+{
+  LastUpdate = 0;
+
+  P = 0.0f;
+  I = 0.0f;
+  D = 0.0f;
+  dT = 0.0f;
+}
+
 void HeaterMeterClientPidOutput::clear(void)
 {
+  Enabled = false;
   Current = 0;
   Fan = 0;
   Servo = 0;
+
+  Internals.clear();
 }
 
 void HeaterMeterClientPid::clear(void)
@@ -154,7 +167,7 @@ void HeaterMeterClient::handleHmStatus(char* data)
   DeserializationError err = deserializeJson(doc, data);
   if (err)
   {
-    Serial.print(F("Could not deserialize JSON event: "));
+    Serial.print(F("Could not deserialize hmstatus event: "));
     Serial.println(err.c_str());
     return;
   }
@@ -162,12 +175,35 @@ void HeaterMeterClient::handleHmStatus(char* data)
   updateProxyFromJson(doc);
 }
 
+void HeaterMeterClient::handlePidInt(char* data)
+{
+  StaticJsonDocument<128> doc;
+  DeserializationError err = deserializeJson(doc, data);
+  if (err)
+  {
+    Serial.print(F("Could not deserialize pidint event: "));
+    Serial.println(err.c_str());
+    return;
+  }
+
+  state.Output.Internals.LastUpdate = millis();
+  state.Output.Internals.P = doc["p"];
+  state.Output.Internals.I = doc["i"];
+  state.Output.Internals.D = doc["d"];
+  state.Output.Internals.dT = doc["t"];
+
+  if (onPidInt)
+    onPidInt();
+}
+
 void HeaterMeterClient::handleServerSentEvent(char* data)
 {
   //Serial.print(_eventType); Serial.write('='); Serial.print(data);
 
   if (strcmp(_eventType, "hmstatus") == 0)
     handleHmStatus(data);
+  else if (strcmp(_eventType, "pidint") == 0)
+    handlePidInt(data);
   else
   {
     //Serial.print(F("Unhandled server-sent event type: "));
diff --git a/arduino/libraries/HeaterMeterClient/src/HeaterMeterClient.h b/arduino/libraries/HeaterMeterClient/src/HeaterMeterClient.h
index 7ae59542..3e6aeb96 100644
--- a/arduino/libraries/HeaterMeterClient/src/HeaterMeterClient.h
+++ b/arduino/libraries/HeaterMeterClient/src/HeaterMeterClient.h
@@ -22,12 +22,25 @@ struct HeaterMeterClientProbe
   void clear(void);
 };
 
+struct HeaterMeterClientPidInternals
+{
+  uint32_t LastUpdate;
+  float P;
+  float I;
+  float D;
+  float dT;
+
+  void clear();
+  bool valid() { return ((LastUpdate != 0) && (millis() - LastUpdate < 3000)); }
+};
+
 struct HeaterMeterClientPidOutput
 {
   bool Enabled; // false if "Off"
   uint8_t Current;
   uint8_t Fan;
   uint8_t Servo;
+  struct HeaterMeterClientPidInternals Internals;
 
   void clear(void);
 };
@@ -63,6 +76,7 @@ class HeaterMeterClient
   std::function<void(void)> onConnect;
   std::function<void(void)> onDisconnect;
   std::function<void(void)> onHmStatus;
+  std::function<void(void)> onPidInt;
   std::function<void(err_t)> onError;
   std::function<void(HmclientProtocolState)> onProtocolStateChange;
 
@@ -80,6 +94,7 @@ class HeaterMeterClient
   bool readLine(char** pos, size_t* len);
   void updateProxyFromJson(JsonDocument& doc);
   void handleHmStatus(char* data);
+  void handlePidInt(char* data);
   void handleServerSentEvent(char* data);
   void handleServerSentLine(void);
   void clientConnect(void);