Replicate single table from SQL Express to SQL Enterprise 2014 We have a small branch app that stores some data in a SQL Express Database.

We want to have an almost real time copy of this table in our headquarters, were we have SQL Enterprise 2014. I say almost, because it doesn't matter if there is a 5 minute delay or something like that. 

The main thing is that it's able to synchronise after a network disconnection between branch and headquarter.

Any solution that does not requiere licensing costs for the branch office?
You can use SQL Server Merge Replication for this.  The SQL Enterprise instance would be the publisher, but Merge Replication can synchronize data both ways.  So changes made at the subscriber would be replicated to the publisher.

If you configure this to be a Push Subscription  the agents will all run at the central instance, and you can schedule them with SQL Agent.