Initial commit: RNodeTHV4 boundary mode firmware for Heltec V4

Bridges LoRa mesh and TCP/WiFi backbone networks using microReticulum.
Based on microReticulum_Firmware with boundary mode additions:
- BoundaryMode.h: State management and EEPROM persistence
- BoundaryConfig.h: WiFi captive portal for configuration
- TcpInterface.h: TCP backbone interface with HDLC framing
- Display.h: Custom OLED layout with network status indicators
- Transport/Identity library patches for embedded memory constraints

nrf52_hash.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+
+# Copyright (C) 2023, Mark Qvist
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import os
+import sys
+import RNS
+import json
+import hashlib
+
+major_version = None
+minor_version = None
+target_version = None
+
+target_file = os.path.join(sys.argv[1])
+
+firmware_data = open(target_file, "rb").read()
+calc_hash = hashlib.sha256(firmware_data).digest()
+
+print(RNS.hexrep(calc_hash, delimit=False))