docs: Add MC_DEVICE_NAME=auto as recommended setting

Updated README.md and .env.example to recommend auto-detection
of device name from meshcli prompt instead of manual configuration.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.env.example

@@ -11,8 +11,9 @@
 MC_SERIAL_PORT=/dev/serial/by-id/[YOUR_DEVICE_ID]
 
 # Your MeshCore device name (used for .msgs file)
-# Example: MarWoj, SP5XYZ, MyNode
-MC_DEVICE_NAME=[YOUR_DEVICE_NAME]
+# Use "auto" for automatic detection from meshcli (recommended)
+# Or specify manually: MarWoj, SP5XYZ, MyNode
+MC_DEVICE_NAME=auto
 
 # MeshCore configuration directory (where .msgs and settings files are stored)
 # Default: ./data/meshcore (inside project directory)

README.md

@@ -69,9 +69,11 @@ For detailed feature documentation, see the [User Guide](docs/user-guide.md).
 
     **Required changes in .env:**
     - `MC_SERIAL_PORT=/dev/serial/by-id/<your-device-id>`
-    - `MC_DEVICE_NAME=<your-device-name>`
+    - `MC_DEVICE_NAME=auto` (recommended) or your device name
     - `TZ=Europe/Warsaw` (optional, set your timezone)
 
+    **Note:** With `MC_DEVICE_NAME=auto`, the system automatically detects your device name from meshcli. This is the recommended setting as it ensures the `.msgs` file always matches your actual device name.
+
     **Leave these as default:**
     ```bash
     MC_CONFIG_DIR=./data/meshcore