add archive for last 10 builds

.gitignore

@@ -15,3 +15,4 @@ build/
 coredump_report.txt
 coredump.bin
 logs/
+elf_archive/

archive_elf.py

@@ -0,0 +1,45 @@
+"""
+PlatformIO post-build script: archive firmware.elf files.
+
+Copies firmware.elf to elf_archive/ with a timestamp after each build.
+Keeps only the last 10 files to avoid filling up disk space.
+
+Usage in platformio.ini
+-----------------------
+    extra_scripts = post:archive_elf.py
+"""
+
+Import("env")
+
+import os
+import shutil
+from datetime import datetime
+
+MAX_ARCHIVES = 10
+ARCHIVE_DIR = os.path.join(env.subst("$PROJECT_DIR"), "elf_archive")
+
+
+def archive_elf(source, target, env):
+    elf_path = os.path.join(env.subst("$BUILD_DIR"), "firmware.elf")
+    if not os.path.isfile(elf_path):
+        print("[archive_elf] firmware.elf not found, skipping.")
+        return
+
+    os.makedirs(ARCHIVE_DIR, exist_ok=True)
+
+    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
+    dest = os.path.join(ARCHIVE_DIR, f"firmware_{timestamp}.elf")
+    shutil.copy2(elf_path, dest)
+    print(f"[archive_elf] Saved {dest}")
+
+    # Keep only the last MAX_ARCHIVES files
+    files = sorted(
+        [f for f in os.listdir(ARCHIVE_DIR) if f.endswith(".elf")],
+    )
+    while len(files) > MAX_ARCHIVES:
+        old = os.path.join(ARCHIVE_DIR, files.pop(0))
+        os.remove(old)
+        print(f"[archive_elf] Removed old archive {old}")
+
+
+env.AddPostAction("$BUILD_DIR/firmware.elf", archive_elf)

platformio.ini

@@ -1,10 +1,16 @@
 ; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
 ; https://docs.platformio.org/page/projectconf.html
 
 [platformio]
-default_envs = esp32dev
+default_envs = esp32devdbg
 
-; Shared settings for all environments
 [env]
 platform = espressif32
 framework = arduino
@@ -14,7 +20,9 @@ lib_deps =
 	knolleary/PubSubClient@^2.8
 	esp32async/ESPAsyncWebServer@^3.10.3
 	esp32async/AsyncTCP@^3.4.10
-extra_scripts = pre:minify.py
+extra_scripts = 
+	pre:minify.py
+	post:archive_elf.py
 board_build.partitions = huge_app.csv
 board_build.filesystem = littlefs
 build_flags = 
@@ -35,5 +43,3 @@ board = esp32dev
 [env:esp32devdbg]
 board = esp32dev
 build_type = debug
-
-