bring awareness of device operating classes to the base universe class

protocol/esta/dmx/dmx.h

@@ -29,6 +29,17 @@
  *  @brief @cite DMX The Digital Multiplex Protocol
  */
 namespace DMX {
+  /// \cite DMX 1.4 Classes of data appropriate for transmission
+  ///
+  /// DMX512 is designed to carry repetitive control data from a single controller
+  /// to one or more receivers.
+  enum DeviceClass
+  {
+    CONTROLLER,                         //!< 3.7 A transmitting device that originates DMX512 data.
+    RECEIVER,                           //!< 3.30 A piece of equipment that accepts a DMX512 signal.
+    RESPONDER,                          //!< 4.3 A RECEIVER capable of returning status information
+  };
+
   /// \cite DMX Table D1 - Reserved START Codes
   static const uint8_t E111_NULL_START       = 0;
   static const uint8_t E111_ASC_TEXT_ASCII   = 23;

protocol/esta/dmx/universe.cpp

@@ -34,6 +34,7 @@ namespace DMX {
  */
 Universe::Universe(int timeout_period)
   : null_start_data({0})
+  , device_class_(RECEIVER)
   , rx_timeout_period_(timeout_period)
   , status_(DMX_NULL)
   , active_data_slots_(1)  // start code
@@ -133,6 +134,9 @@ void Universe::setStatus(uint8_t val)
 void Universe::setValue(const uint16_t start, const uint16_t footprint,
                         const uint8_t * const data)
 {
+  if (!isEditable())
+    return;
+
   // start and footprint valid?
   if (start < 1 || start + footprint > null_start_data.size())
     return;
@@ -302,6 +306,17 @@ void Universe::rx_timeout_(bool add_now)
 }
 
 
+/**
+ * @brief Universe::isEditable
+ * @return
+ */
+bool Universe::isEditable() const
+{
+  std::shared_lock lk_ctl(mtx_control);
+  return device_class_ == CONTROLLER;
+}
+
+
 /**
  * @brief Universe::activeSlots
  * @return

protocol/esta/dmx/universe.h

@@ -63,6 +63,7 @@ class Universe {
     std::shared_ptr<void> onDataChange(const std::function<void(Universe*)>);
     std::shared_ptr<void> onStatusChange(const std::function<void(Universe*)>);
 
+    virtual bool isEditable() const;
     virtual uint16_t activeSlots() const;
 
     /// Known states of the universe Status value
@@ -79,6 +80,7 @@ class Universe {
     void do_callbacks_(std::vector<std::weak_ptr<const std::function<void(Universe*)>>>&);
 
     DimmerData null_start_data;                             //!< NULL Start Code data
+    DeviceClass device_class_;                              //!< operating class of the universe
     mutable std::shared_mutex mtx_data;                     //!< memory protect Null Start data
     mutable std::shared_mutex mtx_control;                  //!< thread protected access control
     std::chrono::system_clock::time_point last_updated_;    //!< time of the latest update

protocol/esta/sacn/universe.cpp

@@ -41,6 +41,7 @@ Universe::Universe(Source* src, Receiver* rsv)
     , sync_data_(nullptr)
     , sync_sequence_(0)
 {
+  device_class_ = sender_ ? DMX::CONTROLLER : DMX::RECEIVER;
   destination.type = ACN::SDT::SDT_ADDR_NULL;
 }
 
@@ -275,17 +276,6 @@ void Universe::setSyncData(const std::vector<uint8_t> & data)
 }
 
 
-/**
- * @brief Universe::isEditable
- * @return
- */
-bool Universe::isEditable() const
-{
-  std::shared_lock lk_ctl(mtx_control);
-  return sender_;
-}
-
-
 /**
  * @brief Universe::activeSlots
  * @return

protocol/esta/sacn/universe.h

@@ -81,8 +81,6 @@ public:
   virtual void resetSynchronization();
   virtual void setSyncData(const std::vector<uint8_t> &);
 
-
-  virtual bool isEditable() const;
   virtual uint16_t activeSlots() const override;
   virtual bool hasSources() const;
   virtual const std::vector<DATA::data_header> sources() const;