RADSEC keep TLS connections open with keep-alive

Hi there, Is it possible to configure FreeRADIUS server not to close TCP/TLS RADSEC connection between NAS and RADIUS server after completing a single request? Some network vendors support sending keep-alive messages through the connection in order to keep it established and re-use it for subsequent requests. I think a possible alternate solution would be to put a load balancer in front of the RADIUS server which would handle the persistent connection. Best, Michal Moravec