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

lib/util/streamutil.js

@@ -1,6 +1,18 @@
+var util = require('util')
+
 var Promise = require('bluebird')
 var split = require('split')
 
+function NoSuchLineError(message) {
+  Error.call(this, message)
+  this.name = 'NoSuchLineError'
+  Error.captureStackTrace(this, NoSuchLineError)
+}
+
+util.inherits(NoSuchLineError, Error)
+
+module.exports.NoSuchLineError = NoSuchLineError
+
 module.exports.readAll = function(stream) {
   var resolver = Promise.defer()
     , collected = new Buffer(0)
@@ -41,7 +53,7 @@ module.exports.findLine = function(stream, re) {
   }
 
   function endListener() {
-    resolver.reject(new Error('No matching line found'))
+    resolver.reject(new NoSuchLineError())
   }
 
   function lineListener(line) {