Add change-mesh-temp patch; include full patch_config

oc-patches/change-mesh-temp/README.md

@@ -0,0 +1,14 @@
+# Bed Mesh Temp Change Patch
+
+## Summary
+Binary patching of 0x36d7bc performed to update the bed mesh preheat command from "M109 S60" to "M109 SXX" using the BED_MESH_TEMP value (35–99°C)
+
+## Summary
+Allow user to set default meshing temp between 35C and 99C (hardcoded val is 60C)
+
+---
+
+## Verification
+- [x] Confirm patched binary boots normally  
+- [ ] Confirm mesh happens at XXC
+- [ ] Verify mesh saves

oc-patches/change-mesh-temp/patch.py

@@ -0,0 +1,126 @@
+#!/usr/bin/env python3
+# - Only tested on 1.1.40 app binary
+
+import os
+import re
+import sys
+import shutil
+from pathlib import Path
+
+# -------------------------------------------------------------------
+# Bed-mesh temp patch:
+#   Replace "M190 S60" -> "M190 SXX"  (XX comes from BED_MESH_TEMP in patch_config)
+#   Only allow 35–99 inclusive to prevent low temps and byte shift.
+#
+BASE_VA = 0x00010000                       # base address
+TARGET_VA = 0x036D7BC                      # address of string "M190 S60" (data_36d7bc)
+EXPECTED_BEFORE = bytes.fromhex("4D31393020533630")  # "M190 S60"
+# -------------------------------------------------------------------
+
+# rootcheck
+if hasattr(os, "geteuid") and os.geteuid() != 0:
+    print("[INFO] Skipping: requires root.", file=sys.stderr)
+    sys.exit(0)
+
+# env/path
+project_root = os.environ.get("REPOSITORY_ROOT")
+squashfs_root = os.environ.get("SQUASHFS_ROOT")
+
+if not project_root or not squashfs_root:
+    print("Error: REPOSITORY_ROOT and SQUASHFS_ROOT must be set in the environment.", file=sys.stderr)
+    sys.exit(1)
+
+project_root = Path(project_root)
+squashfs_root = Path(squashfs_root)
+
+# read BED_MESH_TEMP from patch_config
+cfg_file = project_root / "oc-patches" / "patch_config"
+
+try:
+    cfg_text = cfg_file.read_text(encoding="utf-8", errors="replace")
+    m = re.search(r'^BED_MESH_TEMP\s*=\s*([^\r\n#]+)', cfg_text, flags=re.MULTILINE)
+except FileNotFoundError:
+    print("[INFO] Config file not found; skipping patch.")
+    sys.exit(0)
+
+if not m:
+    print("[INFO] BED_MESH_TEMP not found in config; skipping patch.")
+    sys.exit(0)
+
+# sanitize
+temp_raw = m.group(1).strip()
+if not re.fullmatch(r'\d+', temp_raw):
+    print("[INFO] BED_MESH_TEMP invalid (non-integer); skipping patch.")
+    sys.exit(0)
+
+bed_mesh_temp = int(temp_raw, 10)
+if not (35 <= bed_mesh_temp <= 99):
+    print("[INFO] BED_MESH_TEMP invalid (requires integer 35–99); skipping patch.")
+    sys.exit(0)
+
+# skip if no change (60 in cfg)
+if bed_mesh_temp == 60:
+    print("[INFO] BED_MESH_TEMP is set to 60 (stock) - no change; skipping patch.")
+    sys.exit(0)
+
+# get app
+app_dir = squashfs_root / "app"
+orig = app_dir / "app"
+work = app_dir / "app-patch"
+
+if not orig.is_file():
+    print(f"ERROR: target file not found: {orig}", file=sys.stderr)
+    sys.exit(1)
+
+shutil.copyfile(orig, work)
+
+try:
+    data = bytearray(work.read_bytes())
+except Exception as e:
+    print(f"ERROR: failed to read working file: {e}", file=sys.stderr)
+    sys.exit(1)
+
+# Check/find
+file_off = TARGET_VA - BASE_VA
+if file_off < 0 or file_off + 8 > len(data):
+    print(f"ERROR: invalid offset 0x{file_off:X}", file=sys.stderr)
+    work.unlink(missing_ok=True)
+    sys.exit(0)
+
+before_slice = bytes(data[file_off:file_off+8])
+
+# Confirm location
+if before_slice != EXPECTED_BEFORE:
+    print(
+        f"ERROR: pre-patch bytes mismatch at 0x{file_off:X}\n"
+        f"       found    {before_slice.hex().upper()}\n"
+        f"       expected {EXPECTED_BEFORE.hex().upper()}\n"
+        f"       → skipping patch (unsafe)",
+        file=sys.stderr
+    )
+    work.unlink(missing_ok=True)
+    sys.exit(0)
+
+# write change: keep "M190 S", change last two digits
+digits_off = file_off + 6
+data[digits_off:digits_off+2] = f"{bed_mesh_temp:02d}".encode("ascii")
+
+try:
+    work.write_bytes(data)
+except Exception as e:
+    print(f"ERROR: failed to write working file: {e}", file=sys.stderr)
+    sys.exit(1)
+
+bak = orig.with_suffix(".bak")
+try:
+    shutil.copyfile(orig, bak)
+    shutil.move(str(work), str(orig))
+except Exception as e:
+    print(f"ERROR: failed to replace original app: {e}", file=sys.stderr)
+    sys.exit(1)
+
+after_slice = bytes(data[file_off:file_off+8])
+print(
+    f"[INFO] Patch successful — bed-mesh temp set: 'M190 S60' -> 'M190 S{bed_mesh_temp:02d}'  "
+    f"-  (DEBUG - at 0x{file_off:X}: {before_slice.hex().upper()} → {after_slice.hex().upper()})"
+)

oc-patches/change-mesh-temp/patch.toml

@@ -0,0 +1,6 @@
+id   = "bed_mesh_temp"
+name = "Customize bed mesh temperature"
+compatible_versions = ["1.1.40"]
+after = ["base"]
+run = ["./patch.py"]
+execution_policy = "Always"

oc-patches/patch_config

@@ -26,3 +26,4 @@ HOME_POSITION_FRONT_RIGHT=true
 REPLACE_BOOTLOGO=true
 SET_FIRMWARE_VERSION=true
 ALWAYS_ALLOW_Z_OFFSET_ADJUST=true
+# BOWDEN_LENGTH_MM=700