How Room Alert MAX Sensor Data Is Organized In SNMP

The Channel table contains the actual channel readings and channel-level metadata.

Base table OID

1.3.6.1.4.1.20916.1.14.3.1

Available OIDs in this table

• 1.3.6.1.4.1.20916.1.14.3.1.1.2 = channelGroupReference
• 1.3.6.1.4.1.20916.1.14.3.1.1.3 = channelType
• 1.3.6.1.4.1.20916.1.14.3.1.1.4 = channelValue
• 1.3.6.1.4.1.20916.1.14.3.1.1.5 = channelDescription

Example OID

1.3.6.1.4.1.20916.1.14.3.1.1.5.44.53.48.58.54.50.58.53.53.58...
└────────── Base OID ────────┘└───────────── Index ────────────┘

Example Table WALK

Command Line ExampleGraphical Interface Example

Example using net-snmp

Example using ManageEngine

The channelGroup table links related channels together and ties them back to a sensor.

Base table OID

1.3.6.1.4.1.20916.1.14.2.1

Example command using net-snmp:

snmptable -v3 -l noAuthNoPriv -u admin -m ROOMALERT-MAX-BASE-STATION-MIB [IP address] ROOMALERT-MAX-BASE-STATION-MIB::channelGroupTable

or, without the MIB file loaded:

snmpwalk -v 3 -l noAuthNoPriv -u admin [IP address] 1.3.6.1.4.1.20916.1.14.2.1

Available OIDs in this table

• 1.3.6.1.4.1.20916.1.14.2.1.1.2 = channelGroupSensorId
• 1.3.6.1.4.1.20916.1.14.2.1.1.3 = channelGroupLabel
• 1.3.6.1.4.1.20916.1.14.2.1.1.4 = channelGroupType
• 1.3.6.1.4.1.20916.1.14.2.1.1.5 = channelGroupDescription

The Sensors table stores the sensor name and description.

Base table OID

1.3.6.1.4.1.20916.1.14.1.1

Available OIDs in this table

• 1.3.6.1.4.1.20916.1.14.1.1.1.2 = sensorsName
• 1.3.6.1.4.1.20916.1.14.1.1.1.3 = sensorsDescription

How to match the sensor MAC to the sensor name

The sensorsName table is indexed by the sensor’s MAC address.

Running this command…

snmpwalk -v 3 -l noAuthNoPriv -u admin [IP address] 1.3.6.1.4.1.20916.1.14.1.1.1.2

… returns values such as:

sensorsName.0.190.68.234.63.223 = TH-3FDF 

• If your sensor labels have not been customized, you can match the default labels to their MAC address based on the returned value (TH-3FDF matches up to a MAC address ending in 3F:DF).

• If you have access to the device’s web interface, you can match the MAC to the corresponding sensor card. (See How To Open Your Room Alert Monitor’s Built-in Web Interface.)
  

• Otherwise, you can match the sensor labels to their MAC by getting the HEX value of the returned index.

0.190.68.234.63.223 = 00:BE:44:EA:3F:DF

Decimal → Hex
      0 → 00
    190 → BE
     68 → 44
    234 → EA
     63 → 3F
    223 → DF

If you need to work with individual OIDs, one method is to walk the entire device and then pull the results into a code editor capable of highlighting matches (or “highlighting all occurrences”) such as VS Code. This way, you can highlight a sensor index, or part of a sensor index, and see all matches.