Enhance README with setup and configuration details

service/README.md

@@ -1,13 +1,169 @@
-This Linux service enables MODAQ2 running on system boot. This is useful for running the system headless. You will need to edit the file paths to represent any differences on your computer.
+# MODAQ 2.0 System Service Files
 
-Change m2 to your username
+This directory contains `systemd` service files and configuration used to automatically start MODAQ 2.0 and synchronize the system clock on boot.
+
+---
+
+## Files Overview
+
+| File | Description |
+|------|-------------|
+| `modaq.service` | Launches the MODAQ 2.0 ROS2 application on system startup |
+| `phc2sys.service` | Synchronizes the system clock to the PTP Hardware Clock (PHC) |
+| `ptp4l.service` | Runs the PTP daemon to sync the PHC to a grandmaster clock |
+| `ptp4l.conf` | Configuration file for the `ptp4l` PTP daemon |
+
+---
 
 ## PTP Setup
-1. Determine what NIC your PTP master clock is connected to using the ifconfig command
-2. In ptp4l.conf, change "enp2s0" to the name of you NIC (eth0, enp3s0, eth1, etc.)
-3. In phc2sys.service change "enp2s0" to the name of your NIC used in step 2
-4. Copy ptp4l.conf to /etc/linuxptp
-5. Copy ptp4l.service to /lib/systemd/system
-6. Copy phc2sys.service to /lib/systemd/system
-7. Enable these service to start automatically on boot with "sudo systemctl enable ptp4l.service" and "sudo systemctl enable phc2sys.service"
-8. Disable NTP on the device with "sudo timedatectl set-ntp false"
+
+PTP (Precision Time Protocol) keeps the system clock tightly synchronized to a grandmaster clock over the network. Both `ptp4l` and `phc2sys` must be configured and running before MODAQ 2.0 starts.
+
+### Step-by-Step
+
+1. **Find your NIC** — Identify which network interface your PTP master clock is connected to:
+   ```bash
+   ifconfig
+   ```
+   Look for the interface name (e.g., `eth0`, `enp3s0`, `enp2s0`).
+
+2. **Update `ptp4l.conf`** — Replace `enp2s0` with your interface name:
+   ```bash
+   # Example: change [enp2s0] to [eth0]
+   nano ptp4l.conf
+   ```
+
+3. **Update `phc2sys.service`** — Replace `enp2s0` in the `ExecStart` line with your interface name:
+   ```bash
+   nano phc2sys.service
+   # Change: ExecStart=/usr/sbin/phc2sys -w -s enp2s0 -u 5
+   # To:     ExecStart=/usr/sbin/phc2sys -w -s eth0 -u 5
+   ```
+
+4. **Copy the config file:**
+   ```bash
+   sudo cp ptp4l.conf /etc/linuxptp/ptp4l.conf
+   ```
+
+5. **Copy the service files:**
+   ```bash
+   sudo cp ptp4l.service  /lib/systemd/system/ptp4l.service
+   sudo cp phc2sys.service /lib/systemd/system/phc2sys.service
+   ```
+
+6. **Reload systemd and enable the services:**
+   ```bash
+   sudo systemctl daemon-reload
+   sudo systemctl enable ptp4l.service
+   sudo systemctl enable phc2sys.service
+   ```
+
+7. **Disable NTP** — NTP and PTP must not run simultaneously:
+   ```bash
+   sudo timedatectl set-ntp false
+   ```
+
+8. **Start the services:**
+   ```bash
+   sudo systemctl start ptp4l.service
+   sudo systemctl start phc2sys.service
+   ```
+
+9. **Verify hardware timestamping support** on your NIC:
+   ```bash
+   # Replace eth0 with your interface name
+   ethtool -T eth0
+   ```
+   The output should include `SOF_TIMESTAMPING_TX_HARDWARE` and `SOF_TIMESTAMPING_RX_HARDWARE`.
+
+---
+
+## MODAQ 2.0 Setup
+
+### Installation
+
+```bash
+sudo cp modaq.service /etc/systemd/system/modaq.service
+sudo systemctl daemon-reload
+sudo systemctl enable modaq.service
+```
+
+### Starting / Stopping
+
+```bash
+# Start manually
+sudo systemctl start modaq.service
+
+# Stop
+sudo systemctl stop modaq.service
+
+# Restart
+sudo systemctl restart modaq.service
+```
+
+### Viewing Logs
+
+```bash
+journalctl -u modaq.service -f
+```
+
+### Details
+
+- Waits 2 seconds before starting to allow system services to settle
+- Sources both the ROS2 Humble global environment and the local MODAQ2 workspace
+- Runs `ros2 launch m2_launch m2_launch.py`
+
+---
+
+## Service Configuration Details
+
+### `phc2sys.service`
+
+Synchronizes the Linux system clock to the PTP Hardware Clock (PHC).
+
+| Option | Value | Description |
+|--------|-------|-------------|
+| `-w` | — | Wait until `ptp4l` is synchronized before starting |
+| `-s <NIC>` | Your interface | Use the PHC on this network interface as the clock source |
+| `-u 5` | 5 seconds | Print clock offset statistics every 5 seconds |
+
+### `ptp4l.conf`
+
+| Parameter | Value | Description |
+|-----------|-------|-------------|
+| `time_stamping` | `hardware` | Use hardware timestamping for highest accuracy |
+| `slaveOnly` | `1` | Sync to a master clock only, never become master |
+| `clock_servo` | `linreg` | Use linear regression servo for smoother clock adjustment |
+| `logging_level` | `4` | Standard informational logging |
+| `step_threshold` | `15.0` | Allow a single step correction up to 15 seconds for initial sync |
+
+---
+
+## Useful Commands
+
+```bash
+# Check status of all services
+sudo systemctl status ptp4l.service
+sudo systemctl status phc2sys.service
+sudo systemctl status modaq.service
+
+# View live logs
+journalctl -u ptp4l.service -f
+journalctl -u phc2sys.service -f
+journalctl -u modaq.service -f
+
+# Check current time sync status
+timedatectl status
+```
+
+---
+
+## Requirements
+
+- Ubuntu with ROS2 Humble or Jazzy installed
+- MODAQ2 workspace built at `/home/m2/MODAQ2/` - modify if needed
+- Network interface with PTP/hardware timestamping support
+- `linuxptp` package installed:
+  ```bash
+  sudo apt install linuxptp
+  ```