near-RT RIC project meeting notes from 2021-09-28 say this in item 5 of  https://wiki.o-ran-sc.org/display/RICP/Project+meetings (or check old meeting notes (if the notes are already moved there)): https://wiki.o-ran-sc.org/pages/viewpage.action?pageId=20873969

Basically the simulator in simulators/e2sim is completely outdated (using pre-spec ASN.1) and hasn't been touched for years.

I copy the relevant section from the meeting minutes here:

E2 simulator? Which we is still maintained:

1. https://gerrit.o-ran-sc.org/r/gitweb?p=*sim%2Fe2-interface*.git;a=summary

1. 1. originally developed by AT&T and managed by Alex. Not sure if V... is still maintaining.
2. https://gerrit.o-ran-sc.org/r/gitweb?p=*it/test.git;*a=blob;f=*ric_benchmarking/e2-interface/e2sim*/src/ASN1c/E2AP-PDU.h

1. 1. used by HCL for e2sim deployment and bouncer xapp communication. Here the version which we are using in E2AP-PDU.h is E2APv1.01 (ok to use).
2. https://gerrit.o-ran-sc.org/r/gitweb?p=*it/test.git;*a=blob;f=*simulators/e2sim/*ASN1c/E2AP-PDU.h

1. Summary Ask Alex to continue supporting/working in sim repo's e2 simulator. The other one that should be continued is it/test's ric_benchmarking (as it works wityh bouncer xApp). (b) was taken from (a) and further enhanced.
2. Summary Delete the simulator in it/test's simulators/e2sim subdirectory. Thoralf to file a JIRA case for this towards the infra project.