Difference between revisions of "Watchdog"
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[[File:Watchdog_diagram_user.png|thumb|Watchdog diagram]] | [[File:Watchdog_diagram_user.png|thumb|Watchdog diagram]] | ||
| − | Watchdog is a | + | Watchdog is a function periodically pinging to one defined IP address or URL. It's periodically checking reply from defined IP device by ping (ICMP). You can monitor physical presence of the IP device or Internet connectivity. You can use several WatchDog functions in parallel. |
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| + | Based on each Watchdog state one or several RULEs can be executed. Each one Rule can perform several actions (Set Output, Short Off (restart) output, Toggle output or send Alarm state to the NETIO Cloud service. Based on this Alarm state can NETIO Cloud send email to defined recipient. All Watchdogs are listed in the JSON protocol wit their current states. It can be used by 3rd party software. | ||
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| + | Each Watchdog function state is the <code>FAIL</code> variable. | ||
| + | * Watchdog Fail = '''FALSE'''</code> = ping answer is '''OK''' | ||
| + | * Watchdog Fail = <code>'''TRUE'''</code> = ping answer '''not received''' | ||
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== Structure == | == Structure == | ||
Revision as of 17:07, 16 November 2021
Watchdog is a function periodically pinging to one defined IP address or URL. It's periodically checking reply from defined IP device by ping (ICMP). You can monitor physical presence of the IP device or Internet connectivity. You can use several WatchDog functions in parallel.
Based on each Watchdog state one or several RULEs can be executed. Each one Rule can perform several actions (Set Output, Short Off (restart) output, Toggle output or send Alarm state to the NETIO Cloud service. Based on this Alarm state can NETIO Cloud send email to defined recipient. All Watchdogs are listed in the JSON protocol wit their current states. It can be used by 3rd party software.
Each Watchdog function state is the FAIL variable.
- Watchdog Fail = FALSE = ping answer is OK
- Watchdog Fail =
TRUE= ping answer not received
Structure
| Variable | Value | Description |
|---|---|---|
| target | IP / URL | Monitored address |
| pingInterval | int | [s] Time interval between pings |
| timeout | int | [s] Time waiting for answer |
| maxTimeouts | int | Number of failed pings required to evaluate to FAIL=TRUE
|
| timeToReboot | int | [s] Time the Watchdog waits after announcing an error condition before starting a new cycle |
| maxRestarts | int | Maximum number of restarts when an error condition is declared. After this limit is reached, the Watchdog remains in an FAIL=TRUE state until the next successful ping.
If set to 0, the Watchdog will restart the device after each |
