tendermint/p2p/README.md

## Channels

Each peer connection is multiplexed into channels.
The p2p module comes with a channel implementation used for peer
discovery (called PEX, short for "peer exchange").

<table>
  <tr>
    <td><b>Channel</b></td>
    <td>"PEX"</td>
  </tr>
  <tr>
    <td><b>Messages</b></td>
    <td>
      <ul>
        <li>pexRequestMsg</li>
        <li>pexResponseMsg</li>
      </ul>
    </td>
  </tr>
</table>
<hr />

## Resources

* http://www.upnp-hacks.org/upnp.html