diff --git a/protocol/esta/dmx/universe.cpp b/protocol/esta/dmx/universe.cpp
index 0393405..3ddf987 100644
--- a/protocol/esta/dmx/universe.cpp
+++ b/protocol/esta/dmx/universe.cpp
@@ -182,52 +182,38 @@ void Universe::setValue(const uint16_t address, const uint8_t value)
 void Universe::setData(const std::vector<uint8_t>& data)
 {
   if (data.empty())
-    return;                 // no data
-
-  if (data.front() != E111_NULL_START)
-    return setAltData(data); // Alternate Start Code
-
-  // accept variable lenth input, but never more than the limit
-  const auto max_length = null_start_data.size();
-  const auto length = data.size() < max_length ? data.size() : max_length;
-  {
-    std::unique_lock lk_data(mtx_data);
-    if (length < max_length)
-      null_start_data.fill(0);                                    // wipe old data
-    std::copy_n(data.cbegin(), length, null_start_data.begin());  // copy new data
+    return;                                 // no data
+  switch (data.front()) {
+  case E111_NULL_START:
+    rx_dimmer_data_(data);
+    break;
+  default:
+    if (rx_handlers_.count(data.front()))
+      if (auto sp = rx_handlers_.at(data.front()).lock())
+        (*sp)(data);                        // the owner is still holding the token
   }
-  {
-    std::unique_lock lk_ctl(mtx_control);
-    active_data_slots_ = length;
-  }
-  rx_timeout_(true);                                              // update rx times
-  do_callbacks_(cb_dataChange);                                   // run callbacks
 }
 
 
 /**
- * @brief Universe::setAltData
- * @param data
- *
- * The base class implimentation is to discard the data.
- *
- * \attention re-impliment this method to rx custom alternate start code data.
+ * @brief Universe::onRxData
+ * @param code
+ * @param cb
+ * @return
  */
-void Universe::setAltData(const std::vector<uint8_t> & data)
+std::shared_ptr<void> Universe::onRxData(uint8_t code,
+                                         const std::function<void(const std::vector<uint8_t>&)> cb)
 {
-  switch (data.front())
-  {
-    case E111_ASC_TEXT_ASCII:
-      break;
-    case E111_ASC_TEST:
-      break;
-    case E111_ASC_TEXT_UTF8:
-      break;
-    case E111_ASC_MANUFACTURER:
-      break;
-    case E111_ASC_SIP:
-      break;
-  }
+  std::unique_lock lk_ctl(mtx_control);
+  // wrap the callback with a shared pointer
+  auto sp = std::make_shared<std::function<void(const std::vector<uint8_t>&)>>(std::move(cb));
+  // add callback to list (as a weak pointer)
+  if (rx_handlers_.count(code))
+    rx_handlers_[code] = sp;
+  else
+    rx_handlers_.insert({code, sp});
+  // return token that caller must keep throughout it's scope
+  return sp;
 }
 
 
@@ -265,6 +251,30 @@ std::shared_ptr<void> Universe::onStatusChange(const std::function<void(Universe
 }
 
 
+/**
+ * @brief Universe::rx_dimmer_data_
+ * @param data
+ */
+void Universe::rx_dimmer_data_(const std::vector<uint8_t> &data)
+{
+  // accept variable lenth input, but never more than the limit
+  const auto max_length = null_start_data.size();
+  const auto length = data.size() < max_length ? data.size() : max_length;
+  {
+      std::unique_lock lk_data(mtx_data);
+      if (length < max_length)
+      null_start_data.fill(0);                                    // wipe old data
+      std::copy_n(data.cbegin(), length, null_start_data.begin());  // copy new data
+  }
+  {
+      std::unique_lock lk_ctl(mtx_control);
+      active_data_slots_ = length;
+  }
+  rx_timeout_(true);                                              // update rx times
+  do_callbacks_(cb_dataChange);                                   // run callbacks
+}
+
+
 /**
  * @brief Universe::rx_timeout_
  * @param add_now
diff --git a/protocol/esta/dmx/universe.h b/protocol/esta/dmx/universe.h
index 7643906..b94f583 100644
--- a/protocol/esta/dmx/universe.h
+++ b/protocol/esta/dmx/universe.h
@@ -28,6 +28,7 @@
 #include <chrono>
 #include <cstdint>
 #include <functional>
+#include <map>
 #include <memory>
 #include <shared_mutex>
 #include <queue>
@@ -58,8 +59,8 @@ class Universe {
                           const uint8_t* const data);
     virtual void setValue(const uint16_t address, const uint8_t value);
     virtual void setData(const std::vector<uint8_t> &);
-    virtual void setAltData(const std::vector<uint8_t> &);
 
+    std::shared_ptr<void> onRxData(uint8_t, const std::function<void(const std::vector<uint8_t>&)>);
     std::shared_ptr<void> onDataChange(const std::function<void(Universe*)>);
     std::shared_ptr<void> onStatusChange(const std::function<void(Universe*)>);
 
@@ -86,10 +87,12 @@ class Universe {
     std::chrono::system_clock::time_point last_updated_;    //!< time of the latest update
 
   private:
+    void rx_dimmer_data_(const std::vector<uint8_t> &);
     void rx_timeout_(bool add_now = false);
 
     const int rx_timeout_period_;
     uint8_t status_;                      //!< the operating state of the universe
+    std::map<uint8_t, std::weak_ptr<const std::function<void(const std::vector<uint8_t>&)>>> rx_handlers_;
     std::queue<std::chrono::time_point<std::chrono::system_clock>> rx_times_;
     std::vector<std::weak_ptr<const std::function<void(Universe*)>>> cb_dataChange;
     std::vector<std::weak_ptr<const std::function<void(Universe*)>>> cb_statusChange;