Don't rely on lucky timings when sending messages from the provider.

lib/roles/device.js

@@ -431,8 +431,13 @@ module.exports = function(options) {
     .handler())
 
   function poke() {
-    push.send([wireutil.global,
-      wireutil.makeDevicePokeMessage(options.serial, solo)])
+    push.send([
+      wireutil.global
+    , wireutil.envelope(new wire.DevicePokeMessage(
+        options.serial
+      , solo
+      ))
+    ])
   }
 
   function isGrouped() {