[Solved] Undefined reference to own class used in Arduino sketch .cpp

[DerTomm]

Hi,

I just ran into a problem which occures as soon as I include another own class besides MySensors. Here is my code:

// Enable debug prints to serial monitor
#define MY_DEBUG
// Enable serial gateway
#define MY_GATEWAY_SERIAL

// Set blinking period
#define MY_DEFAULT_LED_BLINK_PERIOD 300

// Inverses the behavior of leds
#define MY_WITH_LEDS_BLINKING_INVERSE

// Enable inclusion mode
#define MY_INCLUSION_MODE_FEATURE
// Enable Inclusion mode button on gateway
//#define MY_INCLUSION_BUTTON_FEATURE

// Inverses behavior of inclusion button (if using external pullup)
//#define MY_INCLUSION_BUTTON_EXTERNAL_PULLUP

// Set inclusion mode duration (in seconds)
#define MY_INCLUSION_MODE_DURATION 60
// Digital pin used for inclusion mode button
#define MY_INCLUSION_MODE_BUTTON_PIN  3

#include <SPI.h>
#include <MySensors.h>
#include "Applications/LedHandler.h"

MyMessage msgNodeTemperature(0, V_TEMP);

LedHandler* ledHandler;

unsigned long lastSentTimestamp = 0L;

void setup() {
  ledHandler = new LedHandler();
}

void presentation() {
// Send the sketch version information to the gateway and Controller
  sendSketchInfo("Demo", "1.0");
  present(0, S_TEMP);  // Board ambient temperature
}

/****************************************************************************************************************
 *
 */
void loop() {

  if (millis() - lastSentTimestamp > 10000) {

    long int rand = random(0, 30);
    send(msgNodeTemperature.set(rand, 1));

    lastSentTimestamp = millis();
  }
}

The problem starts when I create a new object of LedHandler and assign it to the pointer in the setup() method. Then I get the following linker error:

Compiling .pioenvs\nanoatmega328\src\OpenhabDemo.o
Linking .pioenvs\nanoatmega328\firmware.elf
.pioenvs\nanoatmega328\src\OpenhabDemo.o: In function `setup':
C:\Users\Thomas\.platformio\lib\MySensors_ID548/drivers/ATSHA204/sha256.cpp:70: undefined reference to `LedHandler::LedHandler()'
collect2.exe: error: ld returned 1 exit status
*** [.pioenvs\nanoatmega328\firmware.elf] Error 1
 [ERROR] Took 2.97 seconds

Obviously there is a dependency problem. Can you help me how to get rid of it?
I use PlatformIO for compilation. OpenhabDemo.cpp is my main Arduino sketch file.

Here is the header and the class file of the dependend LedHandler:

#ifndef SRC_APPLICATIONS_LEDHANDLER_H_
#define SRC_APPLICATIONS_LEDHANDLER_H_

#include "Actor.h"
#include "ApplicationHelper.h"

class LedHandler: public Actor {

public:

  LedHandler();
  virtual ~LedHandler();

  uint8_t getApplicationPort() const {
    return ApplicationHelper::LED_HANDLER;
  }

  void executeFunction(char* payload);

  void addLed(uint8_t ledPin);
  bool setLedEnabled(uint8_t ledId, bool enabled);

private:

  uint8_t* managedLeds;
  uint8_t ledCounter;

};

#endif /* SRC_APPLICATIONS_LEDHANDLER_H_ */

#include "Applications/LedHandler.h"

/***************************************************************************************************
 *
 */
LedHandler::LedHandler() {
  ledCounter = 0;
  managedLeds = 0;
}

/***************************************************************************************************
 *
 */
LedHandler::~LedHandler() {
  if (managedLeds != 0) {
    delete managedLeds;
  }
}

/***************************************************************************************************
 *
 */
void LedHandler::executeFunction(char* payload) {
 <deleted>
}

/***************************************************************************************************
 *
 */
void LedHandler::addLed(uint8_t ledPin) {
   <deleted>
}

/***************************************************************************************************
 *
 */
bool LedHandler::setLedEnabled(uint8_t ledId, bool enabled) {
  <deleted>
}

[DerTomm]

Finally I found a solution for the described situation.

PlatformIO did not compile all dependend files in a library due to a wrong folder layout. After correcting this it works now.
For people experiencing the same issue I recommend visiting the connected PlatformIO community thread: https://community.platformio.org/t/pio-does-not-compile-all-included-library-classes-which-leads-to-linker-errors/1034