Understanding Alarm, Alert, and Notification Handling

[Владимир Калачихин]

As description on https://signalk.org/specification/1.5.0/doc/notifications.html

"Alarms are raised by placing an alarm object in the vessels.self.notifications tree"

Ok, I send message via wesocket:

{
    "requestId": "01713c7f-4f3d-419f-abb6-92bc18d4ca70",
    "put": {
        "path": "notifications.mob",
        "value": {
            "method": ["sound"],
            "state": "alarm",
            "message": "A man overboard!",
        },

       "timestamp": "2022-03-31T19:03:24.487Z"

   }
}

I receive response:

{
  "state": "COMPLETED",
  "requestId": "01713c7f-4f3d-419f-abb6-92bc18d4ca70",
  "statusCode": 405,
  "message": "PUT not supported for notifications.mob",
  "href": "/signalk/v1/requests/01713c7f-4f3d-419f-abb6-92bc18d4ca70"
}

What's wrong?

[Владимир Калачихин]

So I fully not understand how it works.

I could not set any value on server from client by any way except via normal socket by publish delta. "PUT Requests" as it described in https://signalk.org/specification/1.5.0/doc/put.html not works for me.

четверг, 31 марта 2022 г. в 22:26:18 UTC+3, Владимир Калачихин:

[Paul Reeve]

Have you registered a handler for PUT requests on the target path?

See the plugin documentation documentation for:

app.registerPutHandler(context, path, callback, source)


Paul

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[Владимир Калачихин]

пятница, 1 апреля 2022 г. в 18:23:26 UTC+3, pre...@pdjr.eu:

Have you registered a handler for PUT requests on the target path?

Is it necessary for existing paths?

[Teppo Kurki]

On Thu, Mar 31, 2022 at 10:26 PM Владимир Калачихин <v.kala...@gmail.com> wrote:

As description on https://signalk.org/specification/1.5.0/doc/notifications.html

"Alarms are raised by placing an alarm object in the vessels.self.notifications tree"

Apologies, the wording is pretty unclear here. 

Notifications are just values (with no clear outside action), all you need to do is to send a delta message with notification path and a corresponding value, like 

{

"path": "notifications.propulsion.port.revLimitExceeded",

"value": {

"state": "normal",

"method": ["visual"],

"message": "Port Engine Rev Limit Exceeded is Normal"

}

}

PUT causes a lot of confusion. I extended the PUT part in the FAQ a little: https://github.com/SignalK/signalk-server/wiki/FAQ:-Frequently-Asked-Questions#how-do-i-send-data-to-the-server

[Владимир Калачихин]

Ok, maybe I'll understand someday the difference between PUT and delta messages.

But this: "Sensor data / new values for something are sent as delta messages over the WebSocket connection. " was the key info. Thanks.

пятница, 1 апреля 2022 г. в 19:50:47 UTC+3, Teppo Kurki:

[Владимир Калачихин]

By the way, I understand correctly that "Expected implementation behaviour" not implemented in current version? It's not worked for me...

[Teppo Kurki]

You mean the automatic notifications based on thresholds in zones? Activate the zones plugin.

On Thu, Apr 7, 2022 at 11:20 PM Владимир Калачихин <v.kala...@gmail.com> wrote:

By the way, I understand correctly that "Expected implementation behaviour" not implemented in current version? It's not worked for me...

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[Владимир Калачихин]

пятница, 8 апреля 2022 г. в 18:47:35 UTC+3, Teppo Kurki:

You mean the automatic notifications based on thresholds in zones? Activate the zones plugin.

 Ok, I activated it. But nothing happened.

I do:

add zones and alarmMethod to the needed meta via my server plugin,

running a simulation.

I see that the current value is in alarm zone. I expect to appear a corresponding "notification" path. But this is not happening. Should it?

[Владимир Калачихин]

пятница, 1 апреля 2022 г. в 19:50:47 UTC+3, Teppo Kurki:

On Thu, Mar 31, 2022 at 10:26 PM Владимир Калачихин <v.kala...@gmail.com> wrote:

PUT causes a lot of confusion. I extended the PUT part in the FAQ a little: https://github.com/SignalK/signalk-server/wiki/FAQ:-Frequently-Asked-Questions#how-do-i-send-data-to-the-server

I have not reached Enlightenment...

First, I could not replicate the docs examples. So, if someone points me to a minimal working example - both client and server - I would be very grateful.

Second, I don't understand what app.registerPutHandler is better than just app.get (app.put, app.all)? Both are only available from the client, and Express is better documented.