Echo

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The Echo plugin is arguably the most straightforward layer imaginable—its functionality is exactly what the name suggests: it echoes back whatever data it receives. The moment any input arrives, it’s instantly transmitted back unchanged.

In fact, here’s the entire code for the plugin:

class EchoLayer: doc.Layer {
   construct(doc.PluginHost* pluginHost) {
      basetype.construct(pluginHost);
      pluginHost.m_log.attachListener(onLogRecord @ pluginHost.m_mainThreadScheduler);
   }

   void onLogRecord(
      uint64_t timestamp,
      uint_t recordCode,
      void const* p,
      size_t size
   ) {
      if (recordCode == log.StdRecordCode.Rx)
         try transmit(p, size);
   }
}

And that’s it: a simple tool for testing, and could be your starting point for a more sophisticated testing utility.

Basic Setup

In an active session, e.g. TCP Server, attach the Echo layer.

As packets arrive (shown in green), confirm they are then sent back out (shown in blue).