How to get the time of the last received data for a DataSource?

v8dave

I was wondering how I could do this from the webpage but I think I can use an HTTP getter to poll for this and then set a tag that I can then use on the webpage.

I'll give this a try and see how it works. I'll report back so others who need to the same will know if this work.s

JoelHaggar

You can easily get the timestamp of the last value with

{{myPoint.time}}

Maybe check out the examples on /modules/dashboards/web/mdAdmin/#/dashboard/examples/basics/live-values

v8dave

@phildunlap said in How to get the time of the last received data for a DataSource?:

I would use the "GET /v1/point-values/{xid}/latest" endpoint. It has a query parameter for a limit of points to return, so you can use 2. Give it a look in swagger! Then,

I tried this in an HTTP RECEIVER but it returns error 403 when I try to parse this in the data point. Testing in the receiver setup works.

v8dave

@JoelHaggar said in How to get the time of the last received data for a DataSource?:

You can easily get the timestamp of the last value with
{{myPoint.time}}
Maybe check out the examples on /modules/dashboards/web/mdAdmin/#/dashboard/examples/basics/live-values

That might work if I could compare this to the current time.

JoelHaggar

I'm not the expert on JavaScript here but that should be really easy to do. One thing you could do is have a virtual data point that updates every minute and compare it to the time of that point. One of the other guys can probably post a code example tomorrow.

Jared Wiltshire

This will work:

<ma-now update-interval="1 SECONDS" output="currentTime"></ma-now>
<ma-get-point-value point-xid="YOUR_XID" point="myPoint"></ma-get-point-value>

<!-- Show text if there are no recent values -->
<span ng-show="(currentTime - myPoint.time) > 300000">No recent value</span>

<!-- Switch img src -->
<img ng-src="(currentTime - myPoint.time) > 300000 ? 'bad.png' : 'ok.png'">

v8dave

I tried the following but the image doesn't show

<ma-now update-interval="1 SECONDS" output="currentTime"></ma-now>
<ma-get-point-value point-xid="DP_799565" point="mywatchdog"></ma-get-point-value>

Data State: - <img ng-src="img/ligthbulb_on.png">
<img ng-src="(currentTime - mywatchdog.time > 300000) ? 'img/ligthbulb_off.png' : 'img/ligthbulb_on.png'">

I used the first one to make sure the image would show and it does but the line you gave me (last line) shows a missing image

Jared Wiltshire

Check the position of your brackets in the expression.

v8dave

Same result. No image displayed

<img ng-src="(currentTime - mywatchdog.time) > 300000 ? 'img/ligthbulb_off.png' : 'img/ligthbulb_on.png'">

v8dave

I think I got it to work. I won't know until the data starts to come in again. Needed the dual curly brackets :)

<img ng-src="{{(currentTime - mywatchdog.time) > 300000 ? 'img/ligthbulb_off.png' : 'img/ligthbulb_on.png'}}">