```ruby
require 'tempfile'

class CheckController < ApplicationController
  def index
    url = sanitized_url

    jsonFile = Tempfile.new('bnb')
    harFile = Tempfile.new('bnb')
    browser = Rails.configuration.browser
    cmd = "browsertime -u #{url} -b #{browser} -n 1 --filename #{jsonFile.path} --harFile #{harFile.path}"
    stdout,stderr,status = Open3.capture3(cmd)
    if status.success?
      render json: {stats: JSON.parse(jsonFile.read), har: JSON.parse(harFile.read)}
    else
      render json: { status: "error"}, status: 422
      Rails.logger.error stdout
      Rails.logger.error stderr
    end
  end
end
```

Add new parameter to check command
user
```ruby
require 'tempfile'

class CheckController < ApplicationController
  def index
    url = sanitized_url
    target = params[:target]

    connection = ""
    size = ""
    if target == "mobile"
      connection = "mobilefast3g"
      size = "357x627"
    else
      connection = "cable"
      size = "1280x1024"
    end

    jsonFile = Tempfile.new('bnb')
    harFile = Tempfile.new('bnb')
    browser = Rails.configuration.browser
    cmd = "browsertime -u #{url} -b #{browser} -w #{size} --connection #{connection} -n 1 --filename #{jsonFile.path} --harFile #{harFile.path}"
    Rails.logger.info cmd
    stdout,stderr,status = Open3.capture3(cmd)
    if status.success?
      render json: {stats: JSON.parse(jsonFile.read), har: JSON.parse(harFile.read)}
    else
      render json: { status: "error"}, status: 422
      Rails.logger.error stdout
      Rails.logger.error stderr
    end
  end
end
```
assistant