Device Heartbeat Monitor

Monitor remote device online status via heartbeat pings to healthchecks.io. Use when user asks to check if a device is online or offline, user reports device unreachable or no response from remote OpenClaw, user wants to set up device monitoring or heartbeat, user asks about network connectivity of their devices, or user says ping my device or is my Mac online.

Monitor device online status using heartbeat pings to healthchecks.io (free tier).

Architecture

Device → every N min → curl GET → healthchecks.io → missed? → alert user
User asks "device online?" → agent reads state file or queries API → answer

Security Warning

Never share the full ping URL (https://hc-ping.com/UUID) in any chat message. Messaging platforms (Feishu, Slack, etc.) auto-fetch URLs for link previews, which creates false heartbeat pings. Only pass the UUID portion separately.

Quick Commands

Check local status (no API key needed):

bash scripts/status.sh

View recent logs:

tail -20 ~/.openclaw/logs/heartbeat.log

Read state file directly:

cat ~/.openclaw/logs/heartbeat-state.json

Setup

1. Create a Check on healthchecks.io

Register at https://healthchecks.io, create a Check. Set Period = 3 min, Grace = 5 min. See references/healthchecks-setup.md for details.

2. Install heartbeat service

bash scripts/setup.sh "https://hc-ping.com/UUID" 180

• Arg 1: Full ping URL
• Arg 2: Interval in seconds (default 180 = 3 min)
• Installs as macOS LaunchAgent (auto-start on boot, auto-restart on crash)
• Low priority background process, minimal CPU/battery

3. Verify

bash scripts/status.sh

Remote Status Check (from another device)

bash scripts/check.sh "READONLY_API_KEY" "CHECK_UUID"

Response fields: status (up/down/grace), last_ping (timestamp).

Multi-Device Setup

Create a separate Check per device on healthchecks.io. Each device gets its own UUID. Run setup.sh on each device with its unique URL.

Uninstall

bash scripts/uninstall.sh

Features

• Log rotation: Auto-truncates at 500 lines
• State file: ~/.openclaw/logs/heartbeat-state.json for quick local queries
• Recovery detection: Logs "RECOVERED after N failures" on reconnect
• Fail counter: Tracks consecutive failures in state file

Troubleshooting

• Service not running: bash scripts/setup.sh "URL" 180 to reinstall
• Ping failing: Check network; verify URL with curl -v "URL"
• Logs: ~/.openclaw/logs/heartbeat.log and heartbeat-error.log
• False pings from chat platforms: Regenerate UUID, never share full URL in chat