Add portable LoRa OTA repeater builds

scripts/check_esp32_app_size.py

@@ -1,5 +1,10 @@
 #!/usr/bin/env python3
-"""Fail when an ESP32 app image (including EndF) exceeds its app partition."""
+"""Fail when an ESP32 app image (including EndF) exceeds its app partition.
+
+An optional third argument additionally enforces a portable maximum image size.
+MeshCore's LoRa-OTA ESP32 artifacts use 0x140000 bytes: the legacy app slot
+starts at 0x10000 and the next OTA slot begins at 0x150000.
+"""
 
 from __future__ import annotations
 
@@ -34,12 +39,16 @@ def app_partition_size(table: bytes) -> tuple[str, int]:
 
 
 def main() -> int:
-    if len(sys.argv) != 3:
-        print(f"usage: {Path(sys.argv[0]).name} FIRMWARE.BIN PARTITIONS.BIN", file=sys.stderr)
+    if len(sys.argv) not in (3, 4):
+        print(
+            f"usage: {Path(sys.argv[0]).name} FIRMWARE.BIN PARTITIONS.BIN [MAX_IMAGE_BYTES]",
+            file=sys.stderr,
+        )
         return 2
 
     firmware_path = Path(sys.argv[1])
     partition_path = Path(sys.argv[2])
+    portable_limit = int(sys.argv[3], 0) if len(sys.argv) == 4 else None
     try:
         image_size = firmware_path.stat().st_size
         label, limit = app_partition_size(partition_path.read_bytes())
@@ -55,10 +64,19 @@ def main() -> int:
         )
         return 1
 
-    print(
-        f"ESP32 app image fits {label}: {image_size}/{limit} bytes "
-        f"({limit - image_size} bytes free)"
-    )
+    if portable_limit is not None and image_size > portable_limit:
+        print(
+            f"ESP32 app image is {image_size} bytes, exceeding portable LoRa-OTA "
+            f"slot 0x10000..0x150000 ({portable_limit} bytes) by "
+            f"{image_size - portable_limit} bytes",
+            file=sys.stderr,
+        )
+        return 1
+
+    message = f"ESP32 app image fits {label}: {image_size}/{limit} bytes ({limit - image_size} bytes free)"
+    if portable_limit is not None:
+        message += f"; portable LoRa-OTA slot: {portable_limit - image_size} bytes free"
+    print(message)
     return 0