Lehel Bodo enhanced the ListenTrapSNMP processor in the apache/nifi repository by implementing security hardening for SNMPv3. He introduced logic to automatically disable legacy SNMP versions when SNMPv3 is enabled, addressing protocol security concerns. His work included adding new configuration options for authentication and privacy protocols, as well as refactoring USM user handling to improve validation and code clarity. Lehel updated both documentation and tests to ensure the new security configurations were well-documented and verifiable. Using Java and leveraging expertise in network protocols and security configuration, he delivered a focused, in-depth feature that addressed a specific security requirement.