From 5b4cf53d8a74ca8ab44aad5b96eb14554c0b7808 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kuba=20Szczodrzy=C5=84ski?= <kuba@szczodrzynski.pl>
Date: Thu, 2 Jun 2022 14:14:16 +0200
Subject: [PATCH] [tools] uf2ota: embed build date in extension tags

---
 arduino/libretuya/libraries/Update/uf2ota/uf2types.h | 1 +
 docs/ota/README.md                                   | 1 +
 tools/uf2ota/models.py                               | 1 +
 tools/uf2ota/uf2ota.py                               | 3 +++
 4 files changed, 6 insertions(+)

diff --git a/arduino/libretuya/libraries/Update/uf2ota/uf2types.h b/arduino/libretuya/libraries/Update/uf2ota/uf2types.h
index c8d09e4..2ecf80a 100644
--- a/arduino/libretuya/libraries/Update/uf2ota/uf2types.h
+++ b/arduino/libretuya/libraries/Update/uf2ota/uf2types.h
@@ -72,6 +72,7 @@ typedef enum {
 	UF2_TAG_OTA_VERSION = 0x5D57D0, // format version
 	UF2_TAG_BOARD		= 0xCA25C8, // board name (lowercase code)
 	UF2_TAG_FIRMWARE	= 0x00DE43, // firmware description / name
+	UF2_TAG_BUILD_DATE	= 0x822F30, // build date/time as Unix timestamp
 	UF2_TAG_LT_VERSION	= 0x59563D, // LT version (semver)
 	UF2_TAG_PART_1		= 0x805946, // OTA1 partition name
 	UF2_TAG_PART_2		= 0xA1E4D7, // OTA2 partition name
diff --git a/docs/ota/README.md b/docs/ota/README.md
index f2fa38b..35e638d 100644
--- a/docs/ota/README.md
+++ b/docs/ota/README.md
@@ -49,6 +49,7 @@ Name          | ID       | Type       | Description
 `OTA_VERSION` | 0x5D57D0 | int 8-bit  | format version (for simple compatibility checks)
 `BOARD`       | 0xCA25C8 | string     | board name / code (lowercase)
 `FIRMWARE`    | 0x00DE43 | string     | firmware description / name
+`BUILD_DATE`  | 0x822F30 | int 32-bit | build date/time as Unix timestamp
 `LT_VERSION`  | 0x59563D | semver     | LT version
 `LT_PART_1`   | 0x805946 | string     | OTA1 partition name
 `LT_PART_2`   | 0xA1E4D7 | string     | OTA2 partition name
diff --git a/tools/uf2ota/models.py b/tools/uf2ota/models.py
index 680d0b7..0fd7621 100644
--- a/tools/uf2ota/models.py
+++ b/tools/uf2ota/models.py
@@ -65,6 +65,7 @@ class Tag(IntEnum):
     OTA_VERSION = 0x5D57D0  # format version
     BOARD = 0xCA25C8  # board name (lowercase code)
     FIRMWARE = 0x00DE43  # firmware description / name
+    BUILD_DATE = 0x822F30  # build date/time as Unix timestamp
     LT_VERSION = 0x59563D  # LT version (semver)
     LT_PART_1 = 0x805946  # OTA1 partition name
     LT_PART_2 = 0xA1E4D7  # OTA2 partition name
diff --git a/tools/uf2ota/uf2ota.py b/tools/uf2ota/uf2ota.py
index 229aaf2..b829e6d 100644
--- a/tools/uf2ota/uf2ota.py
+++ b/tools/uf2ota/uf2ota.py
@@ -1,6 +1,7 @@
 # Copyright (c) Kuba Szczodrzyński 2022-05-27.
 
 from argparse import ArgumentParser
+from datetime import datetime
 from zlib import crc32
 
 from dump import uf2_dump
@@ -21,6 +22,7 @@ def cli():
     parser.add_argument("--board", help="Board name/code", type=str)
     parser.add_argument("--version", help="LibreTuya core version", type=str)
     parser.add_argument("--fw", help="Firmware name:version", type=str)
+    parser.add_argument("--date", help="Build date (Unix, default now)", type=int)
     args = parser.parse_args()
 
     if args.action == "info":
@@ -70,6 +72,7 @@ def cli():
 
         uf2.put_int8(Tag.OTA_VERSION, 1)
         uf2.put_str(Tag.DEVICE, "LibreTuya")
+        uf2.put_int32le(Tag.BUILD_DATE, args.date or int(datetime.now().timestamp()))
 
         any_ota1 = False
         any_ota2 = False