Implement set Wifi on/off.

lib/roles/device/plugins/service.js

@@ -521,6 +521,20 @@ module.exports = syrup.serial()
         })
     }
 
+    plugin.setWifiEnabled = function(enabled) {
+      return runServiceCommand(
+          apk.wire.MessageType.SET_WIFI_ENABLED
+        , new apk.wire.SetWifiEnabledRequest(enabled)
+        )
+        .timeout(10000)
+        .then(function(data) {
+          var response = apk.wire.SetWifiEnabledResponse.decode(data)
+          if (!response.success) {
+            throw new Error('Unable to set Wifi')
+          }
+        })
+    }
+
     function runServiceCommand(type, cmd) {
       var resolver = Promise.defer()
       var id = Math.floor(Math.random() * 0xFFFFFF)