Expose current state

components/dmx512/dmx512.cpp

@@ -63,6 +63,7 @@ void DMX512Output::set_channel(uint16_t channel) {
 }
 
 void DMX512Output::write_state(float state) {
+  this->state = state;
   uint16_t value = state * 0xffff;
   if(this->universe_)
     this->universe_->write_channel(this->channel_, (value >> 8));

components/dmx512/dmx512.h

@@ -75,6 +75,7 @@ public:
   void set_universe(DMX512 *universe) { this->universe_ = universe; }
   void set_channel(uint16_t channel);
   void write_state(float state) override;
+  float state;
 
 protected:
   uint16_t channel_{0};