We have developed a web portal outside salesforce while using Salesforce as an identity provider. For the time being, we have some VF pages exposed within iFrames. Many of you know how these .. 'temporary' solution evolve.
However .. the portal itself is hosted on another platform which is all working fine .. however, after some time, the SFDC session expires which is causing a login page within the iFrames.
Is there a way to call, for example, a REST API to extend the SFDC session on a regular interval like for example every 30m ?. This then would make sure while inside the portal .. the SFDC session is kept alive.