./ssmperf <address> [flags]
  -cacert=""        path to CA cert
  -cert=""          path to client cert
  -conn=100         number of client connections
  -count=10000      number of messages sent per connection
  -cpuprofile=""    write cpu profile to file
  -insecure=false   disable TLS
  -key=""           path to client key
  -memprofile=""    write memory profile to this file
  -secret=""        shared secret to use for auth, default to open login if empty
  -size=100         payload size in bytes [16, 980]
  -sub=10           number of subscribers per topic
  -type="UCAST"     message type (UCAST, MCAST, or BCAST)
  -writebuf=1024    write buffer size in bytes