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The arguments are the entity's address, a community string, and an integer trap type.
The entity address can be either an IP address or entity name (if name-to-address resolution is enabled).
The community string is used by the network management software receiving a trap to filter out specfic traps. In this case, the community string is not used for authentication purposes. For example, a particular network management station might be interested only in traps sent with the test1 or test2 community strings, and might ignore all of the traps sent with any other community string.
The trap_type can be any integer; since this is essentially a test program, the trap type is immaterial and is open to interpretation by the network management software receiving the trap.
The primary purpose of this program is to demonstrate how traps are sent using the SNMP library. It can be used to test network management software for correct configuration.
RFC 1155, RFC 1157, RFC 1213