Give forward plugin its own folder. Should make it easier to clean it up.

lib/units/device/plugins/forward/util/writer.js

@@ -0,0 +1,45 @@
+var util = require('util')
+var stream = require('stream')
+
+var HEADER_SIZE = 4
+var MAX_PACKET_SIZE = 0xFFFF
+
+function ForwardWriter(target) {
+  stream.Transform.call(this)
+  this._target = target
+}
+
+util.inherits(ForwardWriter, stream.Transform)
+
+ForwardWriter.prototype._transform = function(chunk, encoding, done) {
+  var header
+    , length
+
+  do {
+    length = Math.min(MAX_PACKET_SIZE, chunk.length)
+
+    header = new Buffer(HEADER_SIZE)
+    header.writeUInt16LE(this._target, 0)
+    header.writeUInt16LE(length, 2)
+
+    this.push(header)
+    this.push(chunk.slice(0, length))
+
+    chunk = chunk.slice(length)
+  }
+  while (chunk.length)
+
+  done()
+}
+
+ForwardWriter.prototype._flush = function(done) {
+  var header = new Buffer(HEADER_SIZE)
+  header.writeUInt16LE(this._target, 0)
+  header.writeUInt16LE(0, 2)
+
+  this.push(header)
+
+  done()
+}
+
+module.exports = ForwardWriter