Embed fixed ESP32 firmware identity

scripts/meshcore_image_identity.py

@@ -0,0 +1,39 @@
+import glob
+import os
+import re
+
+Import("env")
+
+
+def source_filter_text():
+    value = env.GetProjectOption("build_src_filter", "")
+    return " ".join(map(str, value)) if isinstance(value, (list, tuple)) else str(value)
+
+
+def default_firmware_version():
+    pattern = re.compile(r'#\s*define\s+FIRMWARE_VERSION\s+"([^"]+)"')
+    example_dirs = set(re.findall(r"examples[/\\]([A-Za-z0-9_]+)", source_filter_text()))
+    versions = set()
+    for example_dir in example_dirs:
+        header_pattern = os.path.join(
+            env["PROJECT_DIR"], "examples", example_dir, "*.h"
+        )
+        for path in glob.glob(header_pattern):
+            with open(path, encoding="utf-8", errors="ignore") as header:
+                match = pattern.search(header.read())
+            if match:
+                versions.add(match.group(1))
+    return next(iter(versions)) if len(versions) == 1 else "unknown"
+
+# build.sh supplies OTA_VARIANT for release overlays whose logical target can
+# differ from PIOENV. Direct `pio run -e ...` builds still need a useful board
+# identity, so expose the concrete PlatformIO environment as the fallback.
+env.AppendUnique(
+    CPPDEFINES=[
+        ("MESHCORE_BUILD_ENV", env.StringifyMacro(env["PIOENV"])),
+        (
+            "MESHCORE_DEFAULT_FIRMWARE_VERSION",
+            env.StringifyMacro(default_firmware_version()),
+        ),
+    ]
+)