using the "comcast" utility to throttle network traffic to a specific application

comcast.sh

# https://github.com/tylertreat/Comcast

# In this example, the application I want to throttle is on TCP port 9110

comcast="${HOME}/projects/comcast/bin/comcast"

throttle() {
  local profile="${1-wifi}"
  local bandwidth=30000
  local latency=40
  local packet_loss=0.2

  case "${profile}" in
    wifi)
    ;;
    dsl)
      bandwidth=2000
      latency=70
      packet_loss=2
    ;;
    *)
      echo "Usage: $0 [wifi|dsl]" 1>&2
      return 1
    ;;
  esac
  "${comcast}" --stop
  "${comcast}" \
    -target-port 9110 \
    -target-proto tcp \
    -target-bw "${bandwidth}" \
    -latency "${latency}" \
    -packet-loss "${packet_loss}"
}

unthrottle() {
  "${comcast}" --stop
}