Manage dcc-usb-connector auto-stop on removal

connector/README.md

@@ -1,17 +1,53 @@
-# Use a container to implement a serial to net bridge
+# DCC Serial-to-Network Bridge
 
-This uses `ncat` from [nmap](https://nmap.org/ncat/) to bridge a serial port to a network port. The serial port is passed to the Podman command (eg. `/dev/ttyACM0`) and the network port is `2560`.
+This directory provides two ways to bridge a serial port to a network port using `ncat` from [nmap](https://nmap.org/ncat/):
+
+1. **Auto-Start with systemd + udev** (Recommended) - Automatically starts/stops when USB device is plugged/unplugged
+2. **Container-based** - Manual control using Podman/Docker
 
 > [!IMPORTANT]
 > Other variants of `nc` or `ncat` may not work as expected.
 
-## Build and run the container
+## Option 1: Auto-Start with systemd + udev (Recommended)
+
+Automatically start the bridge when USB device `1a86:7523` is connected to `/dev/ttyUSB0` and stop it when removed.
+
+### Quick Install
 
 ```bash
-$ podman buil -t dcc/bridge .
+./install-udev-rule.sh
+```
+
+### Features
+- ✅ Auto-start when device connected
+- ✅ Auto-stop when device removed
+- ✅ User-level service (no root needed)
+- ✅ Runs on boot (with lingering enabled)
+
+See [INSTALL.md](INSTALL.md) for detailed documentation.
+
+### Test
+
+```bash
+# Run the test script
+./test-udev-autostart.sh
+
+# Or manually check
+systemctl --user status dcc-usb-connector.service
+telnet localhost 2560
+```
+
+## Option 2: Container-based (Manual)
+
+### Build and run the container
+
+```bash
+$ podman build -t dcc/bridge .
 $ podman run -d --group-add keep-groups --device=/dev/ttyACM0:/dev/arduino -p 2560:2560 --name dcc-bridge dcc/bridge
 ```
 
+### Test
+
 It can be tested with `telnet`:
 
 ```bash