SNMP Publisher / Agent

[ricardo]

Hi,

Can Mango publish data as a SNMP agent? Can Mango send SNMP traps as an Event Handler type?

BR,
Ricardo

[CraigWeb]

Hi @ricardo

Mango only has 4 publishers: BACnet, Modbus, Mango PTCP and an HTTP publisher

[phildunlap]

Hi Ricardo,

No, Mango does not currently have an SNMP publisher.

Can Mango send SNMP traps as an Event Handler type?

Yes, but it isn't really set up to make such a thing easy. I think we'd best to have a running SNMP data source and use some reflection, something like this, in a Set Point Event Handler,

//untested
var snmpDataSourceId = com.serotonin.m2m2.db.dao.DataPointDao.instance.getIdByXid("DS_XID_HERE");
var snmpDataSourceRT = com.serotonin.m2m2.Common.runtimeManager.getRunningDataSource( snmpDataSourceId );
if( snmpDataSourceRT !== null ) {
    var field = snmpDataSourceRT.getClass().getDeclearedField("snmp");
    field.setAccessible( true );
    var snmp = field.get( snmpDataSourceRT );

    //get the SNMP version information
    field = snmpDataSourceRT.getClass().getDeclearedField("writeVersion");
    field.setAccessible( true );
    var writeVersion = field.get( snmpDataSourceRT );

    //get the target to send it to
    var target = writeVersion.getTarget( "192.168.0.123", 162, 1, 5000 ); //host, port, retries, timeout
    //construct the PDU
    var pdu = writeVersion.createPDU();

    if( target.getVersion === org.snmp4j.mp.SnmpConstants.version1 ) {
        pdu.setType( org.snmp4j.PDU.V1TRAP );
        pdu.setEnterprise( new org.snmp4j.smi.OID( "1.1.1.1.1.1.1") ); //probably a clever way to get the OID from the event
        pdu.setGenericTrap( org.snmp4j.PDUv1.ENTERPRISE_SPECIFIC );
        pdu.setSpecificTrap( 1 ); //looks like this may need to cycle in value 1-5
        pdu.setAgentAddress( new org.snmp4j.smi.IpAddress( "127.0.0.1" )); //Mango's IP on the network here
        snmp.send( pdu, target );
    } else if ( target.getVersion === org.snmp4j.mp.SnmpConstants.version2c ) {
        throw "not yet implemented!";
    } else if ( target.getVersion === org.snmp4j.mp.SnmpConstants.version3 ) {
        throw "not yet implemented!";
    } else
        throw "unknown snmp version!";
} else {
    throw "Data source not found to send trap for event: " + event;
}
return UNCHANGED; //don't set from the set point handler

I would be somewhat surprised if this works, but it shouldn't be too far from the way to do it. I consulted this site for the V1 implementation, and there is also a v2c example: https://www.jitendrazaa.com/blog/java/snmp/generating-trap-in-snmp-using-snmp4j/

So, possible, but will probably take some trial and error to figure out.

[phildunlap]

@craigweb said in SNMP Publisher / Agent:

Hi @ricardo

Mango only has 4 publishers: BACnet, Modbus, Mango PTCP and an HTTP publisher

Also Twilio and Pachube.