Rename "roles" to "units". Put units in their own folders.

lib/units/device/plugins/stats.js

@@ -0,0 +1,46 @@
+var syrup = require('syrup')
+
+var logger = require('../../../util/logger')
+var devutil = require('../../../util/devutil')
+var lifecycle = require('../../../util/lifecycle')
+var streamutil = require('../../../util/streamutil')
+
+module.exports = syrup.serial()
+  .dependency(require('../support/adb'))
+  .dependency(require('../resources/remote'))
+  .define(function(options, adb, remote) {
+    var log = logger.createLogger('device:plugins:stats')
+
+    var service = {
+      port: 2830
+    }
+
+    function openService() {
+      return devutil.ensureUnusedPort(adb, options.serial, service.port)
+        .timeout(10000)
+        .then(function() {
+          return adb.shell(options.serial, [
+              remote.bin
+            , '--lib', remote.lib
+            , '--listen-stats', service.port
+            ])
+            .timeout(10000)
+            .then(function(out) {
+              lifecycle.share('Stats shell', out)
+              streamutil.talk(log, 'Stats shell says: "%s"', out)
+            })
+        })
+        .then(function() {
+          return devutil.waitForPort(adb, options.serial, service.port)
+            .timeout(15000)
+        })
+        .then(function(conn) {
+          return lifecycle.share('Stats connection', conn)
+        })
+    }
+
+    return openService()
+      .then(function() {
+        return {}
+      })
+  })