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Monitoring Connector Assets

Monitored Objects

The Monitoring Connector HMS Ewon including monitoring of Tags.

Collected Metrics

Metric nameDescriptionUnit
interface statusStatus of the tag
tagname#tag.value.countTag value

It is possible to filter on the name of a tag using a REGEXP of the form [--filter-tag-name='Fuel'].


To control your HMS Ewon, the SNMP must be configured.


  1. Install the Centreon Plugin on every Poller:
yum install centreon-plugin-Hardware-Devices-Hms-Ewon-Snmp
  1. On the Centreon Web interface in Configuration > Monitoring Connector Manager, install the HMS Ewon SNMP Monitoring Connector

Host configuration

  • Add a new Host and apply the HW-Device-Hms-Ewon-SNMP-custom Host Template
  • Fill the SNMP Version and Community fields according to the device's configuration

When using SNMP v3, use the SNMPEXTRAOPTIONS Macro to add specific authentication parameters More information in the Troubleshooting SNMP section.

SNMPEXTRAOPTIONSConfigure your own SNMPv3 credentials combo


How to test the Plugin and what are the main options for ?

Once the Plugin installed, log into your Centreon Poller CLI using the centreon-engine user account and test the Plugin by running the following command:

/usr/lib/centreon/plugins/ \
--plugin=hardware::devices::hms::ewon::snmp::plugin \
--mode=tags \
--hostname= \
--snmp-version='2c' \
--snmp-community='ewon_ro' \
--filter-tag-name=Partiel \
--tag-threshold-warning='40000' \
--tag-threshold-critical='50000' \

Expected command output is shown below:

CRITICAL: Tag 'Compt_H_Partiel' value: 441985 | 'Compt_H_Partiel#tag.value.count'=441985;0:40000;0:50000;; 'Compt_Ea_Partiel#tag.value.count'=20507;0:40000;0:50000;; 'Compt_Er_Partiel#tag.value.count'=1040;0:40000;0:50000;;
Tag 'Compt_H_Partiel' status: none, value: 441985
Tag 'Compt_Ea_Partiel' status: none, value: 20507
Tag 'Compt_Er_Partiel' status: none, value: 1040

The command above monitors HMS Ewon tags (--plugin=hardware::devices::hms::ewon::snmp::plugin --mode=tags) identified by the IP address (--hostname= As the Plugin is using the SNMP protocol to request the device, the related community and version are specified (--snmp-version='2c' --snmp-community='ewon_ro').

This command would trigger a WARNING alarm if tags value over 40000 (--tag-threshold-warning='40000') and a CRITICAL alarm over 50000 (--tag-threshold-critical='50000').

For each Plugin mode, all the options as well as all the available thresholds can be displayed by adding the --help parameter to the command:

/usr/lib/centreon/plugins/ \
--plugin=hardware::devices::hms::ewon::snmp::plugin \
--mode=tags \

UNKNOWN: SNMP GET Request : Timeout

If you get this message, you're probably facing one of these issues:

  • The SNMP agent of the device isn't started or is misconfigured
  • An external device is blocking the request (firewall, ...)

UNKNOWN: SNMP GET Request : Cant get a single value.

This error message often refers to the following issues:

  • The HMS Ewon device doesn't support the MIB used by the plugin
  • The targeted SNMP OID cannot be fetched because of insufficient privileges on the device. SNMP Agent must be capable of accessing to the enterprise branch HMS Ewon: .