Wake up and unlock device when it's being used. A bit messy, pending refactor.

lib/util/devutil.js

@@ -91,6 +91,36 @@ devutil.waitForPort = function(adb, serial, port) {
     })
 }
 
+devutil.waitForPortToFree = function(adb, serial, port) {
+  function closedError(err) {
+    return err.message === 'closed'
+  }
+  return adb.openTcpAsync(serial, port)
+    .then(function(conn) {
+      var resolver = Promise.defer()
+
+      function endListener() {
+        resolver.resolve(port)
+      }
+
+      function errorListener(err) {
+        resolver.reject(err)
+      }
+
+      conn.on('end', endListener)
+      conn.on('error', errorListener)
+
+      return resolver.promise.finally(function() {
+        conn.removeListener('end', endListener)
+        conn.removeListener('error', errorListener)
+        conn.end()
+      })
+    })
+    .catch(closedError, function(err) {
+      return port
+    })
+}
+
 devutil.listPidsByComm = function(adb, serial, comm, bin) {
   var users = {
     shell: true