net ssh hang

    def ssh_session_to_remote
     cmd = "sudo /bin/su - user1"
      begin
      status = Timeout::timeout(300) do
        Net::SSH.start(host, username, :password => 'password') do |ssh|
       ssh.open_channel do |channel|
         channel.request_pty
         channel.exec(cmd);
         channel.on_data do |ch, data|
           if data =~ /[$%#>]/
            channel.send_data "cd /home/userX/data \n"
            channel.send_data "touch #{@file_name} \n"
            channel.send_data "echo \"#{@csv_string}\">>#{@file_name}
\n"
            channel.send_data "exit \n"
            channel.send_data "\n~."
           end
      end
    end
  end
end
 rescue Timeout::Error
 puts "Timeout occurred"
 end
 @file_location =
"/home/#{@remote_params[:username]}/data/#{@file_name}"
end