```ruby
module LitmusPaper
  module Dependency
    class TCP
      def initialize(ip, port, options = {})
        @ip, @port = ip, port
        @timeout = options.fetch(:timeout_seconds, 5)
        @input_data = options[:input_data]
        @expected_output = options[:expected_output]
      end

      def available?
        response = true

        Timeout.timeout(@timeout) do
          socket = TCPSocket.new(@ip, @port)
          if @input_data || @expected_output
            socket.puts(@input_data.to_s)
            data = socket.gets
            response = data.chomp == @expected_output
            LitmusPaper.logger.info("Response (#{response}) does not match expected output (#{@expected_output})")
          end
          socket.close
        end

        response
      rescue Timeout::Error
        LitmusPaper.logger.info("Timeout connecting #{@ip}:#{@port}")
        false
      rescue => e
        LitmusPaper.logger.info("TCP available check to #{@ip}:#{@port} failed with #{e.message}")
        false
      end

      def to_s
        "Dependency::TCP(tcp://#{@ip}:#{@port})"
      end
    end
  end
end

```

Stop writing into the socket when input_data is not supplied.
user
```ruby
module LitmusPaper
  module Dependency
    class TCP
      def initialize(ip, port, options = {})
        @ip, @port = ip, port
        @timeout = options.fetch(:timeout_seconds, 5)
        @input_data = options[:input_data]
        @expected_output = options[:expected_output]
      end

      def available?
        response = true

        Timeout.timeout(@timeout) do
          socket = TCPSocket.new(@ip, @port)
          if @expected_output
            socket.puts(@input_data) if @input_data
            data = socket.gets
            response = data.chomp == @expected_output
            LitmusPaper.logger.info("Response (#{response}) does not match expected output (#{@expected_output})")
          end
          socket.close
        end

        response
      rescue Timeout::Error
        LitmusPaper.logger.info("Timeout connecting #{@ip}:#{@port}")
        false
      rescue => e
        LitmusPaper.logger.info("TCP available check to #{@ip}:#{@port} failed with #{e.message}")
        false
      end

      def to_s
        "Dependency::TCP(tcp://#{@ip}:#{@port})"
      end
    end
  end
end

```
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