Fix BLE Link-Layer byte order

[sacca97]

The Bluetooth standard requires multi-octet Link Layer fields to transmit the least-significant octet first Vol 6, Part B, §1.2

Hence, BTLE_CONNECT_REQ, LL_CONNECTION_PARAM_REQ, LL_CONNECTION_PARAM_RSP, LL_PHY_UPDATE_IND, LL_CIS_REQ, LL_CIS_RSP, and LL_CIS_IND were changed accordingly.

AI-Assisted: no

[polybassa]

Thanks for the PR. Please revert all formatting only changes to reduce our review effort.

[sacca97]

My bad. Done!

[polybassa]

Please fix

'''
2026-08-03T22:17:43.2866695Z ##[group]Run bash ./.config/ci/check_commits.sh
2026-08-03T22:17:43.2869601Z �[36;1mbash ./.config/ci/check_commits.sh�[0m
2026-08-03T22:17:43.2917056Z shell: /usr/bin/bash -e {0}
2026-08-03T22:17:43.2918458Z env:
2026-08-03T22:17:43.2919300Z PR_FETCH_DEPTH: 5
2026-08-03T22:17:43.2920242Z ##[endgroup]
2026-08-03T22:17:43.3048446Z ERROR: Commit �[0;33m12a3bd2b9a5f057b558c5fd516a9b4a176e7ce6e�[0m is missing the 'AI-Assisted: yes|no [tool(s)]' trailer.
2026-08-03T22:17:43.3070904Z ERROR: Commit �[0;33mcf5ebe20c0caef20ffc6b4da0152a81abf5ac663�[0m is missing the 'AI-Assisted: yes|no [tool(s)]' trailer.
2026-08-03T22:17:43.3093760Z ERROR: Commit �[0;33m806929e1facb3f935b3fc11aa7a216733f466a67�[0m is missing the 'AI-Assisted: yes|no [tool(s)]' trailer.
2026-08-03T22:17:43.3116715Z ERROR: Commit �[0;33m4162425bca5ee74a8ff84672615d0b9f28be65bc�[0m is missing the 'AI-Assisted: yes|no [tool(s)]' trailer.
2026-08-03T22:17:43.3120101Z
2026-08-03T22:17:43.3121492Z �[0;31mPlease add the 'AI-Assisted' trailer to commit messages !�[0m
2026-08-03T22:17:43.3123997Z See the contribution guide at: https://github.com/secdev/scapy/blob/master/CONTRIBUTING.md
2026-08-03T22:17:43.3136660Z ##[error]Process completed with exit code 1.

[Copilot]

Pull request overview

This pull request aligns Scapy’s Bluetooth LE Link Layer packet serialization with the Bluetooth Core spec requirement that multi-octet Link Layer fields are transmitted least-significant octet first (little-endian), correcting the on-the-wire byte order for several LL PDUs.

Changes:

• Switched BTLE/LL packet fields in BTLE_CONNECT_REQ, LL_CONNECTION_PARAM_REQ/RSP, LL_PHY_UPDATE_IND, and LL_CIS_* to little-endian field types (XLE*).
• Added/updated unit tests to assert the exact raw byte layouts for BTLE_CONNECT_REQ, LL_CONNECTION_PARAM_REQ/RSP, and LL_PHY_UPDATE_IND.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
test/scapy/layers/bluetooth4LE.uts	Adds raw byte-order assertions for several updated LL PDUs to prevent regressions.
scapy/layers/bluetooth4LE.py	Corrects field endianness for multiple Link Layer PDUs by using little-endian field classes.

---

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.50%. Comparing base (5e13d41) to head (e4810ab).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5072      +/-   ##
==========================================
- Coverage   80.50%   80.50%   -0.01%     
==========================================
  Files         390      390              
  Lines       96785    96785              
==========================================
- Hits        77920    77912       -8     
- Misses      18865    18873       +8     

Files with missing lines	Coverage Δ
scapy/layers/bluetooth4LE.py	96.87% <ø> (ø)

... and 9 files with indirect coverage changes

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