Feature/bacnet zigbee link layer handler

[luiz-santana18]

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[Copilot]

Pull request overview

This PR introduces initial Zephyr-side configuration and build plumbing for a BACnet Zigbee (BZLL) datalink handler, and tightens up character classification in a couple of shell/settings parsers to avoid undefined behavior with isalpha().

Changes:

• Added a new bacnet_datalink Kconfig menu and wired it into the subsystem Kconfig tree.
• Extended the Zephyr build to compile additional BZLL/Zigbee-related sources and propagate BZLL timing settings via compile definitions.
• Updated isalpha() usage to cast inputs to unsigned char in shell and settings parsing.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
zephyr/subsys/Kconfig	Includes the new BACnet datalink Kconfig subtree.
zephyr/subsys/bacnet_shell/bacnet_shell_property.c	Fixes isalpha() usage by casting to unsigned char.
zephyr/subsys/bacnet_settings/bacnet_settings.c	Fixes isalpha() usage by casting to unsigned char.
zephyr/subsys/bacnet_datalink/Kconfig	New Kconfig menu for BACnet datalink/BZLL timing parameters.
zephyr/include/bacnet_settings/bacnet_storage.h	Adds <stdio.h> include (currently unused in the header).
zephyr/CMakeLists.txt	Adds Zigbee/BZLL source files and exports BZLL timing values as compile definitions.

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