feat(matter): fixes matter temperature sensor endpoint to indicate celsius as measure unit (#10759)

Author: SuGlider

libraries/Matter/examples/MatterTemperatureSensor/MatterTemperatureSensor.ino

@@ -42,7 +42,7 @@ const uint32_t decommissioningTimeout = 5000;  // keep the button pressed for 5s
 // Simulate a temperature sensor - add your preferred temperature sensor library code here
 float getSimulatedTemperature() {
   // The Endpoint implementation keeps an int16_t as internal value information,
-  // which stores data in 1/100th of any temperature unit
+  // which stores data in 1/100th Celsius.
   static float simulatedTempHWSensor = -10.0;
 
   // it will increase from -10C to 10C in 0.5C steps to simulate a temperature sensor
@@ -70,7 +70,7 @@ void setup() {
   Serial.println();
 
   // set initial temperature sensor measurement
-  // Simulated Sensor - it shall initially print -25 degrees and then move to the -10 to 10 range
+  // Simulated Sensor - it shall initially print -25C and then move to the -10C to 10C range
   SimulatedTemperatureSensor.begin(-25.00);
 
   // Matter beginning - Last step, after all EndPoints are initialized
@@ -102,7 +102,7 @@ void loop() {
   // Print the current temperature value every 5s
   if (!(timeCounter++ % 10)) {  // delaying for 500ms x 10 = 5s
     // Print the current temperature value
-    Serial.printf("Current Temperature is %.02f <Temperature Units>\r\n", SimulatedTemperatureSensor.getTemperature());
+    Serial.printf("Current Temperature is %.02fC\r\n", SimulatedTemperatureSensor.getTemperature());
     // Update Temperature from the (Simulated) Hardware Sensor
     // Matter APP shall display the updated temperature percent
     SimulatedTemperatureSensor.setTemperature(getSimulatedTemperature());

libraries/Matter/src/MatterEndpoints/MatterTemperatureSensor.cpp

@@ -96,7 +96,7 @@ bool MatterTemperatureSensor::setRawTemperature(int16_t _rawTemperature) {
     }
     rawTemperature = _rawTemperature;
   }
-  log_v("Temperature Sensor set to %.02f Degrees", (float)_rawTemperature / 100.00);
+  log_v("Temperature Sensor set to %.02fC", (float)_rawTemperature / 100.00);
 
   return true;
 }

libraries/Matter/src/MatterEndpoints/MatterTemperatureSensor.h

@@ -23,7 +23,7 @@ class MatterTemperatureSensor : public MatterEndPoint {
 public:
   MatterTemperatureSensor();
   ~MatterTemperatureSensor();
-  // begin Matter Temperature Sensor endpoint with initial float temperature
+  // begin Matter Temperature Sensor endpoint with initial float temperature in Celsius
   bool begin(double temperature = 0.00) {
     return begin(static_cast<int16_t>(temperature * 100.0f));
   }
@@ -32,11 +32,11 @@ class MatterTemperatureSensor : public MatterEndPoint {
 
   // set the reported raw temperature
   bool setTemperature(double temperature) {
-    // stores up to 1/100th of a degree precision
+    // stores up to 1/100th Celsius precision
     int16_t rawValue = static_cast<int16_t>(temperature * 100.0f);
     return setRawTemperature(rawValue);
   }
-  // returns the reported float temperature with 1/100th of a degree precision
+  // returns the reported float temperature with 1/100th Celsius precision
   double getTemperature() {
     return (double)rawTemperature / 100.0;
   }
@@ -55,7 +55,7 @@ class MatterTemperatureSensor : public MatterEndPoint {
 
 protected:
   bool started = false;
-  // implementation keeps temperature in 1/100th of a degree, any temperature unit
+  // implementation keeps temperature in 1/100th Celsius x 100 (int16_t) normalized value
   int16_t rawTemperature = 0;
   // internal function to set the raw temperature value (Matter Cluster)
   bool setRawTemperature(int16_t _rawTemperature);