Sending raw traps to Spectrum, they don't show up under Events, but can be found when using sniffer trace.
Looking under sniffer trace, SNMP package, expand:
-> Simple Network Management Protocol -> data: trap -> trap -> verify agent-addr:
This entry should show the source ip address, could not be loopback address (127.0.0.1) or 0.0.0.0
When sending the trap, make sure agent address is correctly set.