openairinterface5g/openair2/UTIL/OPT

# SPDX-License-Identifier: CC-BY-4.0

How to configure wireshark for dissecting LTE/NR protocols:
- start the wireshark as a sudoers
  - goto analyze->enabled prototols
  => enable mac_xxx_udp and rlc_xxx_udp (xxx is lte or nr)
  - goto edit/preferences and expand Protocols
  - select UDP and check "try heuristic sub-dissectors first"
  - select MAC-LTE (or MAC-NR), and check all the options (checkboxes), and set the "which layer info to show in info column" to "MAC info"
  - select RLC-LTE (or NR), and check all the options except the "May see RLC headers only", and
    set the "call PDCP dissector for DRB PDUs" to "12-bit SN". Optionally you may select the sequence analysis for RLC AM/UM.
  - select PDCP-LTE (or NR)

    How to use
    - start eNB or UE with option --opt.type wireshark
  --opt options are:
    --opt.type none/wireshark/pcap
  --opt.ip 127.0.0.1 to specify the output IP address (default: 127.0.0.1)
        output port is always: 9999 (to change it, change constant: PACKET_MAC_LTE_DEFAULT_UDP_PORT in OAI code)
        --opt.path file_name to specify the file name (pcap)
        - capture on local interface "lo"
        - filter out the ICMP/DNS/TCP messages (e.g. "!icmp && !dns && !tcp")