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HTTP API for LastValue returning result with &lt prefix

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Hi

I'm trying to create a sensor compares the last result of two other sensors. One value should be less than 1. The other value should be 200-500

The problem i am having is that when the value of one sensor is less that one, i get the value prefixed with "&lt"

This is REALLY problematic as i need to do a comparison between two numbers!!

How can i get it to return just a number??

The code i'm using looks like this:

		$Method = 'POST'
		$ContentType = 'application/json'
		
		
		$URI_SensorBP17 = 'https://prtg.oursite.com/api/getsensordetails.json?id='+$SensorIDBP17+'&[email protected]&passhash=123456789'
		$URI_SensorBP18 = 'https://prtg.oursite.com/api/getsensordetails.json?id='+$SensorIDBP18+'&[email protected]&passhash=123456789'

		 # This function returns a deserialized object (not JSON!)
		$contentL1 = Invoke-RestMethod -uri $URI_SensorL1 -Method $Method -ErrorVariable errmsg -ErrorAction SilentlyContinue -ContentType $ContentType
		$contentL2 = Invoke-RestMethod -uri $URI_SensorL2 -Method $Method -ErrorVariable errmsg -ErrorAction SilentlyContinue -ContentType $ContentType


		if (($contentL1.sensordata.lastvalue -gt 5) -and ($contentL2.sensordata.lastvalue -lt 5)) {
			# Active on L1
			$xmlToPRTG = @" 
			<prtg>
				<result> 
					<channel> Failover Monitor </channel> 
					<value>50</value> 
					<LimitMode>0</LimitMode>
				</result>
			</prtg>
"@;
			$xmlToPRTG 

And when lastvalue < 1, for the output i get:

$contentL1.sensordata.lastvalue = &lt; 0,01 Mbit/s

api last prtg

Created on Aug 10, 2016 12:44:59 PM by  trunq (11) 1

Last change on Aug 10, 2016 12:50:41 PM by  Torsten Lindner [Paessler Support]



5 Replies

Accepted Answer

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Hm, apart from this being rather strange - have you tried invoke webrequest instead, combined with convertfrom-json? You could also simply replace the &lt; with -replace '&lt;', '' - but that's not good practice, either :)

Created on Aug 12, 2016 10:03:44 AM by  Stephan Linke [Paessler Support]



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Hi Stephan,

Thanks for the reply. Have tried it with Invoke-Webrequest and convertfrom-Json and the result is the same:

&lt; 0,01 Mbit/s

True i could do the -replace and i probably will have to.

However, I feel like this is a bug with the API. A numerical field should only contain numerical values. Is this something that can be fixed in the API?

Or is there a way to get the API to round values up/down to nearest integer for example?

Created on Aug 12, 2016 10:50:13 AM by  trunq (11) 1



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I'll try the API call as well and let you know what I found out. Is it possible that the actual
value is < 0,01 MBit/s in the sensor?

Created on Aug 12, 2016 11:17:48 AM by  Stephan Linke [Paessler Support]



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Hey Stephan, It probably is. To be honest don't spend any more time checking this. Using the -replace option in powershell fixed it fine. I realized i should have been removing the "Mbit/s" and converting to a number as well in order to do math-based operations as well. So adding in one extra step is not a problem :) thanks for your help!

Created on Aug 12, 2016 11:59:17 AM by  trunq (11) 1



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Alright then :)

Created on Aug 12, 2016 12:14:11 PM by  Stephan Linke [Paessler Support]



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