Running L3 ITTI simulator

This page is valid on the following branches: - `develop` starting from tag `2020.w48` # 1. Building the ITTI simulator. The ITTI simulator is available directly from the standard build. ```bash $ source oaienv $ cd cmake_targets $ sudo ./build_oai -x -w None -c -ittiSIM ``` # 2. Running the ITTI simulator. The ITTI simulator establishes ITTI-threaded communication between the gNB RRC task and the UE RRC task. This allows to test the sequence of NGAP/RRC/NAS messages. The main limitations are: - NAS is a simple stub that just sends and receives messages - only initial Attach sequence ## 2.1. Starting the ITTI simulator The ITTI simulator is able to run with a connected 5GC or without any. The develop branch tag `2020.w48` only works RRC without 5GC connection. ```bash $ sudo -E ./ran_build/build/nr-ittisim -O gnb.conf ```