Changelog

v1.2.0 - Raspberry Pi 5 compatibility + deep bug-fix pass

Target: Raspberry Pi 5 (BCM2712, Cortex-A76, aarch64 LP64, 8GB) & Ubuntu 24.04.

Added include/portable.h / src/portable.c: endian-safe big-endian wire writers/readers (PS/PES fields built by shift, never by char* casts, so correct under strict alignment and on any endianness); monotonic clock (CLOCK_MONOTONIC) instead of wall clock; nanosleep-based sleep (usleep is deprecated on newer glibc); portable_thread_create with explicit stack size (256KB) so worker threads behave predictably on the 8GB board.
Fixed PTHREAD_STACK_MIN signed-vs-unsigned comparison (would break -Werror on both x86_64 LP64 and aarch64).
All 64-bit logging uses PRIu64 from <inttypes.h> (LP64-safe on aarch64).

common.h missing <stdint.h>/<inttypes.h> -> byte/64-bit types undefined.
platform.c function-pointer type mismatch: p_ecms_init declared void*(*)(void) but assigned void*(*)(void*) (incompatible-pointer-types) and would mis-call the SDK init.
platform.c NET_ECMS_GetLastError ? ... : ... took the address of a function -> always true (dead ternary). Now calls the getter directly.
config.c unused static kv() + leftover sep/key dead vars (unused-function/unused-variable).
main.c getopt string had a stray space "c: tsh" and no grouping -> -t/-s parsing unreliable; corrected to "c:tsh".
main.c self-test set g_cfg.simulate=1 BEFORE config_defaults() which reset it to 0 -> self-test tried to dlopen the real SDK and failed. Reordered.
stream.c push(): logged s->channel AFTER releasing s->lock -> use-after-unlock race. Now snapshots channel/frames under the lock.
stream.c / playback.c session-table removal previously shift-compacted and dropped the tail slot (lost sessions + leaked mutexes). Now clear-in-place.
stream.c stream_stats / playback.c playback_get_session / alarm.c accessors triggered -Wmisleading-indentation (multi-if on one line). Rebraced for clarity and warning-clean build.
Alarm ring buffer overflow path now wraps g_head correctly (v1.0 lost events on wrap).

8 source files (portable/config/platform/stream/playback/alarm/main/isup_stub), 7 headers (portable/common/config/platform/stream/playback/alarm/isup_sdk).
isup_stub.c: mock ISUP SDK behind -DISUP_SIM so it compiles, links and self-tests on Pi5 with NO proprietary .so. Production: drop real aarch64 libHCNetSDK.so into libs/ and make (no -DISUP_SIM).
Platform layer uses dlopen for the real SDK so the binary never hard-links against a library that may be absent.

make simulate: 0 warnings, 0 errors.
./...-sim -t self-test (register -> PS->RTMP 50 frames -> playback start/pause/resume/stop -> 2 alarms + ack -> logout): PASSED, exit 0.
./...-sim -c config.ini -s then SIGTERM: graceful shutdown, heartbeat thread joined, exit 0.