Uptime Kuma 1.23.13 uses monitoring type MQTT, but after configuration, it keeps failing: Timeout

[1104817655]

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📝 Describe your problem

2024-12-05T15:21:38+08:00 [MONITOR] WARN: Monitor #9 'mqtt': Failing: Timeout | Interval: 20 seconds | Type: mqtt | Down Count: 0 | Resend Interval: 0

Is there a configuration manual available?

📝 Error Message(s) or Log

2024-12-05T15:21:38+08:00 [MONITOR] WARN: Monitor #9 'mqtt': Failing: Timeout | Interval: 20 seconds | Type: mqtt | Down Count: 0 | Resend Interval: 0

🐻 Uptime-Kuma Version

1.23.13

💻 Operating System and Arch

Debian GNU/Linux 10 \n \l

🌐 Browser

131.0.6778.108

🖥️ Deployment Environment

• Runtime:
• Database:
• Filesystem used to store the database on:
• number of monitors: