I have a XML/REST Value sensor working fine, unfortunately, the XML return value is a string, not a numeric value. We would like to receive the string, and use a custom lookup to convert translate to the PRTG state.

Something like this, within the lookup .ovl file - 

<SingleInt state="OK" value="Up">
  Service is UP
</SingleInt>

Is there a way to do this with the XML/REST value sensor, or should I use a different sensor?

Article Comments

PRTG lookups can only interpret numeric values. We have reversal lookups on our wishlist, but this may take a while. Please bear with us one this one.

In the meantime, you might need a custom PowerShell that does the evalution of the values :)


Oct, 2014 - Permalink

Ok, thanks. I had a feeling that might be the case.

I have been working on a custom SSH script that pulls the JSON encoded data, parses it, then returns a prtg-readable result. Looks like I'm on the right track.

Thanks!


Oct, 2014 - Permalink

Note that we also have a XML/REST available, it also works with JSON:

https://www.paessler.com/manuals/prtg/http_xmlrest_value_sensor.htm

Maybe you can use this one before you put any work into that script :)


Nov, 2014 - Permalink

Hi Stephan.

Yes, that is where I started. But that sensor does not process string (text) values. Only numeric values. Note that I'm looking to process a value of "UP". This is not something the XML/REST sensor can do. At least not yet.


Nov, 2014 - Permalink

Hi Paesler Team , was there a way to solve the same problem without the use of additional scripts, add-ons of the sensor, or by changing the custom lookup ?


Oct, 2018 - Permalink

Hi there,

You could take a look at the Rest Custom Sensor of PRTG which offers you more options. For example to check if the Value "Up" is found in a specific node you could use:

{
  "prtg": {
	"text": $.some.node,
    "result": [
      {
        "channel": "Total",
        "value": lookup($.some.node, "Up"),
	"limitmode": 1,
	"LimitMinError": 0,
	"LimitErrorMsg": "The value for 'node' is not 'Up'!"
      }
    ]
  }
}

Best regards.


Oct, 2018 - Permalink

I am completely confused in the sensor REST Custom. I ask you to help. I do not quite have a standard response from the device I want to monitor, when requested "http://1.1.1.1:2222/default/en_US/status.xml" (GoIP GSM-gateway)

I get such an answer

<status>
    <l1_module_status_gsm>1</l1_module_status_gsm>
    <l1_module_title_gsm/>
    <l1_module_status><a href="?type=list&down=1&line=1">Y</a></l1_module_status>
    <l1_module_title>Click to shut down module</l1_module_title>
    <l1_gsm_sim>Y</l1_gsm_sim>
    <l1_gsm_status>Y</l1_gsm_status>
    <l1_status_line>Y</l1_status_line>
    <l1_line_state>IDLE</l1_line_state>
    <l1_sms_login/>
    <l1_smb_login><font color="#FF0000">N</font></l1_smb_login>
    <l1_gsm_signal>19</l1_gsm_signal>
    <l1_gsm_cur_oper>MegaFon</l1_gsm_cur_oper>
    <l1_gsm_cur_bst/>
    <l1_lac/>
    <l1_sim_remain>NO LIMIT</l1_sim_remain>
    <l1_nocall_t>0</l1_nocall_t>
    <l1_acd>95</l1_acd>
    <l1_asr>18</l1_asr>
    <l1_callt>2118m</l1_callt>
    <l1_callc>1827/10575</l1_callc>
    <l1_rct>2018-09-06 04:00:46</l1_rct>
    <l1_sms_count>NO LIMIT</l1_sms_count>
    <l1_call_count>NO LIMIT</l1_call_count>
    <l2_module_status_gsm>2</l2_module_status_gsm>
    <l2_module_title_gsm/>
    <l2_module_status><a href="?type=list&down=1&line=2">Y</a></l2_module_status>
    <l2_module_title>Click to shut down module</l2_module_title>
    <l2_gsm_sim>Y</l2_gsm_sim>
    <l2_gsm_status>Y</l2_gsm_status>
    <l2_status_line>Y</l2_status_line>
    <l2_line_state>IDLE</l2_line_state>
    <l2_sms_login/>
    <l2_smb_login><font color="#FF0000">N</font></l2_smb_login>
    <l2_gsm_signal>25</l2_gsm_signal>
    <l2_gsm_cur_oper>MegaFon</l2_gsm_cur_oper>
    <l2_gsm_cur_bst/>
    <l2_lac/>
    <l2_sim_remain>NO LIMIT</l2_sim_remain>
    <l2_nocall_t>0</l2_nocall_t>
    <l2_acd>85</l2_acd>
    <l2_asr>17</l2_asr>
    <l2_callt>1509m</l2_callt>
    <l2_callc>1280/7861</l2_callc>
    <l2_rct>2018-09-06 04:00:46</l2_rct>
    <l2_sms_count>NO LIMIT</l2_sms_count>
    <l2_call_count>NO LIMIT</l2_call_count>
</status>

I need only these lines

    <l1_gsm_sim>Y</l1_gsm_sim>
    <l1_gsm_status>Y</l1_gsm_status>
    <l1_status_line>Y</l1_status_line>
    <l1_gsm_signal>19</l1_gsm_signal>

The status "Y" is good, the status "N" is an accident, but in the event of an accident the next line comes 

    <l1_gsm_sim><font color="#FF0000"></font></l1_gsm_sim>
    <l1_gsm_status><font color="#FF0000">N</font></l1_gsm_status>
    <l1_status_line><font color="#FF0000">N</font></l1_status_line>
    <l1_gsm_signal>0</l1_gsm_signal>

It is desirable in one sensor, with the ability to turn on the alarm when the status changes.


Oct, 2018 - Permalink

Hi there,

Unfortunately, the above "XML"-structure cannot be monitored as is it not an XMl structure. It looks more like HTML mixed with a XML-like structure, which the parser we use is not able to parse because of these lines:

<l1_module_status><a href="?type=list&down=1&line=1">Y</a></l1_module_status>
<l2_module_status><a href="?type=list&down=1&line=2">Y</a></l2_module_status>

And later because of the following within the "<l1_gsm_sim>"-node:

<font color="#FF0000"></font>

Maybe there is another API available that also outputs JSON or a clean XML structure?

Best regards.


Oct, 2018 - Permalink