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Fix F1AP for UEContextSetupRequest and UEContextSetupRequest

Xin Zhe Khooi requested to merge fix_f1ap_uecontextsetup into develop

This merge request fixes the following issues:

  1. When DU receives a UEContextSetupRequest with a list of DRBs to add, the DU does not create the corresponding GTP tunnels (08b46a42).
  2. When CU receives a UEContextSetupResponse, it updates the internal entries using the wrong UE ID -- DU UE ID, instead of CU UE ID (a1a052ce).
  3. When CU generates a UEContextSetupRequest when it creates a GTP tunnel towards the DU, the DL TNL port is not set and is 0 (28b6306c).

Apologies for the typo in the git messages. Hopefully, it is fine.

How were the above issues discovered? When we manually trigger an RRCRelease for a UE, and then the UE reconnects.

Edited by Xin Zhe Khooi

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