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  • Hi,

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

    BR,
    Ricardo


  • Hi @ricardo

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


  • 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.


  • @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.