> cd .\src\main\config
> .\run.bat

$ cd ./src/main/config
$ java -jar snmpToGrpc.jar

linkDown NOTIFICATION-TYPE
    OBJECTS { ifIndex, ifAdminStatus, ifOperStatus }
    STATUS  current
    DESCRIPTION
            "A linkDown trap signifies that the SNMP entity, acting in
            an agent role, has detected that the ifOperStatus object for
            one of its communication links is about to enter the down
            state from some other state (but not from the notPresent
            state).  This other state is indicated by the included value
            of ifOperStatus."
    ::= { snmpTraps 3 }

rpc TrplinkDown (LInkDownKey) returns (NoKey) {}
 ...
// nodeName=linkDown
message LInkDownKey {
  int32 ifIndex = 1; // Integer32
  int32 ifAdminStatus = 2; // INTEGER
  int32 ifOperStatus = 3; // INTEGER
}

ifEntry OBJECT-TYPE
    SYNTAX      IfEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "An entry containing management information applicable to a
            particular interface."
    INDEX   { ifIndex }
    ::= { ifTable 1 }

IfEntry ::=
    SEQUENCE {
        ifIndex                 InterfaceIndex,
        ifDescr                 DisplayString,
        ifType                  IANAifType,
        ifMtu                   Integer32,
        ifSpeed                 Gauge32,
        ifPhysAddress           PhysAddress,
        ifAdminStatus           INTEGER,
        ifOperStatus            INTEGER,
        ifLastChange            TimeTicks,
        ifInOctets              Counter32,
        ifInUcastPkts           Counter32,
        ifInNUcastPkts          Counter32,  -- deprecated
        ifInDiscards            Counter32,
        ifInErrors              Counter32,
        ifInUnknownProtos       Counter32,
        ifOutOctets             Counter32,
        ifOutUcastPkts          Counter32,
        ifOutNUcastPkts         Counter32,  -- deprecated
        ifOutDiscards           Counter32,
        ifOutErrors             Counter32,
        ifOutQLen               Gauge32,    -- deprecated
        ifSpecific              OBJECT IDENTIFIER -- deprecated
    }

  rpc SetIFEntry (IFEntryKeyIndex) returns (NoKey) {}
  rpc GetIFEntry (IFEntryIndex) returns (IFEntryKey) {}
  rpc SayIFEntry (NoKey) returns (stream IFEntryIndex) {}
  ...
message IFEntryKeyIndex {
  IFEntryKey key = 1; 
  IFEntryIndex value = 2; 
}
message IFEntryIndex {
  int32 ifIndex = 1; // Integer32
}
message IFEntryKey {
  int32 ifType = 1; // IANAifType
  int32 ifMtu = 2; // Integer32
  bytes ifPhysAddress = 3; // OCTET STRING
  uint32 ifInDiscards = 4; // Counter32
  uint32 ifOutUcastPkts = 5; // Counter32
  uint32 ifSpeed = 6; // Gauge32
  uint32 ifInNUcastPkts = 7; // Counter32
  uint32 ifInErrors = 8; // Counter32
  string ifDescr = 9; // DisplayString
  bytes ifLastChange = 10; // TimeTicks
  uint32 ifOutDiscards = 11; // Counter32
  uint32 ifOutQLen = 12; // Gauge32
  uint32 ifInUnknownProtos = 13; // Counter32
  uint32 ifInUcastPkts = 14; // Counter32
  uint32 ifOutOctets = 15; // Counter32
  uint32 ifInOctets = 16; // Counter32
  uint32 ifOutErrors = 17; // Counter32
  uint32 ifOutNUcastPkts = 18; // Counter32
}

ifTestId         OBJECT-TYPE
    SYNTAX       TestAndIncr
    MAX-ACCESS   read-write
    STATUS       deprecated
    DESCRIPTION
            "This object identifies the current invocation of the
            interface's test."
    ::= { ifTestEntry 1 }

  rpc SetIFTestId (IFTestIdKey) returns (NoKey) {}
  rpc GetIFTestId (NoKey) returns (IFTestIdKey) {}
  ...
message IFTestIdKey {
  int32 ifTestId = 1; // INTEGER
}

        LinkDownKey key = LinkDownKey
                .newBuilder()
                .setIfIndex(1)
                .setIfAdminStatus(2)
                .setIfOperStatus(3)
                .build();

        LinkDownKey key = LinkDownKeySnmpBuilder
                .newBuilder()
                .setIfIndex(new org.snmp4j.smi.Integer32(1))
                .setIfAdminStatus(new org.snmp4j.smi.Integer32(2))
                .setIfOperStatus(new org.snmp4j.smi.Integer32(3))
                .build();

        LinkDownKey key = ...
        //
        int ifIndex = key.getIfIndex();
        int ifAdmin = key.getIfAdminStatus();
        int ifOper  = key.getIfOperStatus();

        LinkDownKey work = ...
        LinkDownKeySnmpWrapper key = new LinkDownKeySnmpWrapper(work);
        //
        org.snmp4j.smi.Integer32 ifIndex = key.getIfIndex();
        org.snmp4j.smi.Integer32 ifAdmin = key.getIfAdminStatus();
        org.snmp4j.smi.Integer32 ifOper  = key.getIfOperStatus();