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

esp32_btbufs.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+import sys
+import re
+
+try:
+    target_path = sys.argv[1]
+    rxbuf_size = 0; rxbuf_minsize = 6144
+    txbuf_size = 0; txbuf_minsize = 384
+    line_index = 0
+    rx_line_index = 0
+    tx_line_index = 0
+    with open(target_path) as sf:
+        for line in sf:
+            line_index += 1
+            if line.startswith("#define RX_QUEUE_SIZE"):
+                ents = re.sub(" +", " ", line).split(" ")
+                try:
+                    rxbuf_size = int(ents[2])
+                    rx_line_index = line_index
+                except Exception as e:
+                    print(f"Could not parse Bluetooth RX_QUEUE_SIZE: {e}")
+
+            if line.startswith("#define TX_QUEUE_SIZE"):
+                ents = re.sub(" +", " ", line).split(" ")
+                try:
+                    txbuf_size = int(ents[2])
+                    tx_line_index = line_index
+                except Exception as e:
+                    print(f"Could not parse Bluetooth TX_QUEUE_SIZE: {e}")
+
+            if rxbuf_size != 0 and txbuf_size != 0:
+                break
+
+    if rxbuf_size < rxbuf_minsize:
+        print(f"Error: The configured ESP32 Bluetooth RX buffer size is too small, please set it to at least {rxbuf_minsize} and try compiling again.")
+        print(f"The buffer configuration can be modified in line {rx_line_index} of: {target_path}")
+        exit(1)
+
+    if txbuf_size < txbuf_minsize:
+        print(f"Error: The configured ESP32 Bluetooth TX buffer size is too small, please set it to at least {txbuf_minsize} and try compiling again.")
+        print(f"The buffer configuration can be modified in line {tx_line_index} of: {target_path}")
+        exit(1)
+
+    exit(0)
+
+except Exception as e:
+    print(f"Could not determine ESP32 Bluetooth buffer configuration: {e}")
+    print("Please fix this error and try again")