sms-interaction-edit-mode

For "read" case you need to get all "unread" messages (that's done correctly), for "unread" case you need to get only one the latest incoming message to be more efficient. So IMO in addition to setting ```filter.delivery = 'received'``` you'll need either add "maxCount\limit" support to ```MessageManager.getMessages``` and set it here to ```1``` or implement similar method, like ```MessageManager.getMessage()``` that accepts filter and returns only first message that matches. I'd prefer first option, but it's up to you and your reviewer :)