Added options to expire tasks and prevent duplicates.

config.coffee

@@ -16,6 +16,7 @@ exports.MEMCACHED_SOCKET = '/tmp/memcached.sock'
 exports.WORKER_RESPAWN_TIME = 3000
 exports.LOG_INFORMS = false
 exports.DEBUG_DEVICES = {} # {'202BC1-BM632w-8KA8WA1151100043' : true}
+exports.DEVICE_ONLINE_THRESHOLD = 4000
 
 parameters = require './parameters'
 aliases = {}