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Enable AT command interface in NR UE

Sakthivel Velumani requested to merge NR_UE_multi_pdu into develop

This MR is a continuation of !2485.

List of changes

  1. Changes to NAS to send multiple PDU session request.
  2. Enable AT command interface. The command parser and API already exists. Added new handler functions to set and activate PDP contexts.
  3. Extended parser function to parse NSSAI from AT command.
  4. Added two command line parameters. One to enable usage of AT-command interface (--AT) and another to enter the virtual serial port to be used by the AT interface (--AT-interface).

Usage

  1. Run socat to connect two virtual serial interfaces. This outputs two interface names.
  2. Run UE with --AT --AT-interface "<interface-1>"
  3. Open interface-2 with screen or minicom and send the AT commands.
  4. Supported commands: at+cgdcont and at+cgact.
Edited by Sakthivel Velumani

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