Once the LTE UE's tunnel interface with the EPC is ready to be established, if we are in NSA mode, we do not want to launch the tunnel interface from the LTE UE side, but in the NR UE. Via itti_msgs we send the string containing the tunnel interface 'up' command to the NR UE and bring it up from the NR UE.
This directory contains the NFAPI code.
It comes in two parts:
1 - open-nFAPI
This is a clone of the github repository
(https://github.com/cisco/open-nFAPI,
commit b3bc579b1697eab829d5d8a2de59c93a61b88fa4).
The patch open-nfapi.oai.patch has then been applied.
2 - oai_integration
This is code written by David Price from Cisco to integrate
open-nFAPI into OpenAirInterface.