feat: initial setup for Meshtastic Heltec V4 node, custom CA HTTPS firmware, backups, and tooling

scripts/flash_custom_firmware.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+PORT="${1:-/dev/cu.usbmodem1101}"
+OFFSET="${2:-0x10000}"
+BIN_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)/firmware-custom"
+BIN_FILE="${BIN_DIR}/firmware-heltec-v4-2.7.26.54e0d8d.bin"
+
+if [[ ! -f "$BIN_FILE" ]]; then
+  echo "Error: Firmware binary not found at $BIN_FILE" >&2
+  exit 1
+fi
+
+ESPTOOL_BIN="$(which esptool || which esptool.py || echo "${HOME}/.local/bin/esptool.py")"
+
+echo "Flashing $BIN_FILE to $PORT at offset $OFFSET..."
+"$ESPTOOL_BIN" --port "$PORT" --baud 921600 write_flash "$OFFSET" "$BIN_FILE"
+echo "Flash completed successfully."