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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -7,6 +7,8 @@ This Node-RED flow provides automated modem power cycling when internet connectivity issues are detected. It monitors multiple network health indicators and triggers smart modem reboots based on configurable thresholds, helping maintain reliable internet connectivity without manual intervention. Read the article for this [here](https://skylar.tech/home-assistant-internet-monitoring-packet-loss-latency-and-automatic-modem-reboots/) **Companion Flow:** This flow complements the [Internet Connectivity Monitor](https://gist.github.com/skylord123/438e7bbdb5474ab9b738f1c79284b7d9) by providing automated remediation when issues are detected. ## Features -
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,142 @@ # Auto Power Cycle Modem <img width="1770" height="765" alt="image" src="https://gist.github.com/user-attachments/assets/3c9ec173-19b0-4044-acd9-0d896a41f788" /> ## Overview This Node-RED flow provides automated modem power cycling when internet connectivity issues are detected. It monitors multiple network health indicators and triggers smart modem reboots based on configurable thresholds, helping maintain reliable internet connectivity without manual intervention. **Companion Flow:** This flow complements the [Internet Connectivity Monitor](https://gist.github.com/skylord123/438e7bbdb5474ab9b738f1c79284b7d9) by providing automated remediation when issues are detected. ## Features This flow monitors four distinct conditions that can trigger an automatic modem reboot: ### 1. **Sustained Internet Outage** - Triggers when internet is completely down for more than 2 minutes - Ensures the modem has been powered on for at least 3 minutes before rebooting (prevents rapid cycling) ### 2. **Intermittent Connectivity Issues** - Monitors for frequent connection drops over a 5-minute window - Configurable threshold (default: 3 outages in 5 minutes) - Requires modem to be powered on for at least 5 minutes before triggering - Analyzes historical state changes to identify unstable connections ### 3. **Remote Host Packet Loss Detection** - Monitors packet loss across multiple remote hosts (Google, Cloudflare DNS) - **Intelligent multi-host verification** prevents false positives from single-endpoint issues - Configurable parameters in the `Packet Loss Tracker` function node: ```javascript const THRESHOLD_PERCENT = 10; // Packet loss percentage threshold const REQUIRED_FAILED_HOSTS = 2; // Number of hosts that must exceed threshold const DURATION_SECONDS = 60; // How long ALL hosts must be failing ``` - Example: With default settings, requires 2 remote hosts with ≥10% packet loss for 60 seconds - Prevents unnecessary reboots when a single remote service (e.g., Google or Cloudflare) has independent issues ### 4. **Router-to-Modem Packet Loss** - Monitors packet loss on the local link between router and modem using `sensor.modem_packet_loss` - Detects issues with the physical connection or modem performance - Triggers on ≥10% packet loss sustained for 2 minutes - Requires modem powered on for at least 5 minutes ## Control Features ### Auto-Reboot Switch - Global on/off control via Home Assistant entity: `switch.auto_reboot_modem` - When disabled, all automatic reboot triggers are suppressed - Separate switch available for packet loss monitoring: `switch.auto_reboot_modem_for_packet_loss` ### Reboot Flow Protection - Prevents multiple simultaneous reboot attempts using flow context variable - Automatic cooldown period between reboot cycles - Sequential reboot logic: 1. Turn off modem power (smart plug) 2. Wait 5 seconds 3. Turn on modem power 4. Wait 20 seconds for modem to stabilize 5. Monitor for internet restoration (2-minute timeout) 6. Send appropriate notification (success or retry) ### Notification System - Centralized notification hub via link nodes - Customizable notification messages for different trigger scenarios: - "Internet outage detected. Power cycling modem." - "Intermittent outage detected. Power cycling modem." - "Packet loss detected. Power cycling modem." - "Internet restored" (success) - "Internet is still out, power cycling modem again." (retry) - Extensible notification delivery options: - Smart speaker announcements - Mobile app push notifications - Matrix/chat room messages (works during internet outages with self-hosted servers) - Log file recording ## Prerequisites ### Required Home Assistant Entities - `binary_sensor.internet_status` - Binary sensor indicating internet connectivity - `switch.kauf_plug_two` - Smart plug controlling modem power (**replace with your own switch entity**) - `sensor.google_com_packet_loss` - Packet loss percentage to Google - `sensor.cloudflare_dns_packet_loss` - Packet loss percentage to Cloudflare DNS - `sensor.modem_packet_loss` - Packet loss between router and modem ### Required Node-RED Nodes - `node-red-contrib-home-assistant-websocket` (v0.80.3 or compatible) ## Installation 1. Import the flow JSON into Node-RED 2. **Replace all instances of `switch.kauf_plug_two` with your own smart switch/plug entity ID** that controls your modem's power - Use the search function in Node-RED (Ctrl+F / Cmd+F) to find all occurrences - There are multiple nodes that reference this entity 3. Verify all other Home Assistant entities are correctly configured for your setup 4. Enable the `Auto reboot modem` switch in Home Assistant 5. Configure notification endpoints as desired 6. Deploy the flow ## Configuration ### Adjusting Trigger Thresholds **Sustained Outage Duration:** - Modify the "Internet out for more than X minutes" group - Change the `for` parameter in the state-changed node (default: 2 minutes) **Intermittent Outage Detection:** - Edit the `THRESHOLD` variable in the "Internet intermittently out" function node - Adjust `TIME_WINDOW_MINUTES` to change the monitoring period (default: 5 minutes) **Remote Host Packet Loss Parameters:** - Open the `Packet Loss Tracker` function node - Modify configuration constants at the top of the code - Adjust `REQUIRED_FAILED_HOSTS` to require more/fewer failing endpoints - Change `DURATION_SECONDS` to modify how long conditions must persist **Router-to-Modem Packet Loss:** - Modify the threshold percentage in the state-changed node (default: 10%) - Adjust the `for` duration (default: 2 minutes) **Modem Stabilization Times:** - Delay nodes control power-off duration (default: 5 seconds) and post-boot wait time (default: 20 seconds) - Adjust these based on your modem's boot requirements ### Notification Customization Connect your preferred notification method to the "Modem Reboot Notifications" link input node (`link in 5`). The payload contains the notification message string. ## How It Works The flow uses a state machine approach with flow context variables to prevent race conditions. When a trigger condition is met: 1. Checks if `auto_reboot_modem` switch is enabled 2. Verifies modem has been powered on for minimum duration 3. Checks if another reboot flow is already running 4. Sets flow context flag to prevent concurrent reboots 5. Executes power cycle sequence 6. Monitors for internet restoration 7. Sends appropriate notifications 8. Clears flow context flag If internet doesn't restore within the timeout period, the flow recursively triggers another reboot attempt. This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. 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