IDE/iotsafe: fix memory TLS wrapper and example build

[danielinux]

Revived and fixed IoT-Safe example, including:

• Hardened the memory_tls wolfSSL I/O wrapper in IDE/iotsafe/memory-tls.c:74 by centralizing send/recv handling, validating pointers and indices, enforcing sz > 0 and sz <= TLS_BUFFERS_SZ, and preventing out-
  of-bounds copies.
• Fixed the callback behavior in ServerSend / ServerRecv / ClientSend / ClientRecv so they return WANT_READ or WANT_WRITE only when no progress is possible, while safely handling partial in-memory transfers.
• Added missing error handling for wolfSSL_CTX_iotsafe_enable() and wolfSSL_iotsafe_on_ex() in IDE/iotsafe/memory-tls.c:242 and IDE/iotsafe/memory-tls.c:333.
• Fixed the server-side receive path to NUL-terminate the received buffer before printing it as a C string in IDE/iotsafe/memory-tls.c:466.
• Fixed the BSP header in IDE/iotsafe/devices.h:28 by adding the missing <stdint.h> include.
• Fixed the example configuration in IDE/iotsafe/user_settings.h:120 by removing the invalid WOLFSSL_SP_MATH + WOLFSSL_SP_MATH_ALL combination and adding WOLFSSL_NO_SOCK for this bare-metal build.
• Fixed the example linker collision in IDE/iotsafe/devices.c:231 by removing the redundant _sbrk_r definition that conflicts with current newlib.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Revives the IoT-Safe memory-TLS example by hardening the in-memory wolfSSL I/O callbacks and fixing several build/runtime issues in the example configuration and BSP stubs.

Changes:

• Centralizes and hardens in-memory send/recv logic for wolfSSL CBIO callbacks, including partial transfer handling and additional error checking for IoT-Safe enablement.
• Updates example build configuration (feature flags / no-sockets) and BSP headers for correctness.
• Removes a redundant _sbrk_r that collides with newer newlib implementations.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
IDE/iotsafe/user_settings.h	Adjusts wolfSSL feature defines for the bare-metal example (adds WOLFSSL_NO_SOCK).
IDE/iotsafe/memory-tls.c	Refactors CBIO send/recv into helpers, adds error handling for IoT-Safe enablement, and NUL-terminates server-received data before printing.
IDE/iotsafe/devices.h	Adds missing <stdint.h> include for fixed-width types.
IDE/iotsafe/devices.c	Removes conflicting _sbrk_r implementation to fix linker collision with newlib.

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[github-actions]

MemBrowse Memory Report

No memory changes detected for:

• gcc-arm-cortex-m4
• gcc-arm-cortex-m4-baremetal
• gcc-arm-cortex-m4-min-ecc
• gcc-arm-cortex-m4-tls12

[dgarske]

Jenkins retest this please. History lost for PRB master