added notifyStatus to DeviceListener and log errors/info from enhanced device, switch to send error instead of duplicate when starting arbitration if that is already in progress, fix enhanced arbitration, also send initial reset if enhanced device is on network

src/lib/ebus/device.h

@@ -66,6 +66,13 @@ class DeviceListener {
    * @param received @a true on reception, @a false on sending.
    */
   virtual void notifyDeviceData(symbol_t symbol, bool received) = 0;  // abstract
+
+  /**
+   * Called to notify a status message from the device.
+   * @param error true for an error message, false for an info message.
+   * @param message the message string.
+   */
+  virtual void notifyStatus(bool error, const char* message) = 0;  // abstract
 };
 
 
@@ -113,6 +120,12 @@ class Device {
    */
   virtual result_t open();
 
+  /**
+   * Has to be called by subclasses upon successful opening the device as last action in open().
+   * @return the @a result_t code.
+   */
+  result_t afterOpen();
+
   /**
    * Close the file descriptor if opened.
    */
@@ -225,7 +238,7 @@ class Device {
 
  private:
   /** the @a DeviceListener, or nullptr. */
-public: DeviceListener* m_listener;
+  DeviceListener* m_listener;
 
   /** the arbitration master address to send when in arbitration, or @a SYN. */
   symbol_t m_arbitrationMaster;