SQL CAL For RDS Connection Broker HA?

Hi Guys

I am trying to get to the bottom of whether I need CALs for SQL Server Standard to make my RDS Connection Broker Highly Available. The database is used by the connection broker for connection persistence and nothing else.

https://blogs.technet.microsoft.com/volume-licensing/2014/03/10/licensing-how-to-when-do-i-need-a-cl...

"Generally speaking – server to server communication does not require a CAL. However, servers used to pool connections (sometimes referred to as multiplexing) does not reduce your CAL licensing requirements. If, for example, you have an application server which uses SQL Server for its database – users of the application (or the devices they use) will need a SQL CAL even though they may not access the SQL Server directly"

I dont think I do as the connection broker is not an application server as such and users...