[MAX6675] Changed self test

src/shared/sensors/MAX6675/MAX6675.cpp

@@ -42,7 +42,9 @@ SPIBusConfig MAX6675::getDefaultSPIConfig()
 
 bool MAX6675::init() { return true; }
 
-bool MAX6675::selfTest()
+bool MAX6675::selfTest() { return true; }
+
+bool MAX6675::checkConnection()
 {
     uint16_t sample;
 
@@ -51,7 +53,7 @@ bool MAX6675::selfTest()
         sample = spi.read16();
     }
 
-    // The third bit (D2) indicates wheter the termocouple is connected or not.
+    // The third bit (D2) indicates wheter the termocouple is connected or not
     // It is high if open
     if ((sample % 0x2) != 0)
     {

src/shared/sensors/MAX6675/MAX6675.h

@@ -62,6 +62,11 @@ public:
      */
     bool selfTest();
 
+    /**
+     * @brief Checks whether the thermocouple is connected or not.
+     */
+    bool checkConnection();
+
 private:
     TemperatureData sampleImpl() override;