Get it from the releases: https://github.com/negbie/hammerHEP/releases
Or:
go install github.com/negbie/hammerHEP
-address string
Destination Address (default "localhost")
-port string
Destination Port (default "9060")
-protocol string
Possible protocols are HEP,IPFIX (default "HEP")
-rate int
Packets per second (default 16)
-transport string
Possible transports are UDP,TCP,TLS (default "TLS")
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hammerHEP -rate 100