Gemify, and begin a test for the mock sensor.

Rakefile

@@ -1,3 +1,18 @@
 task :default do
   sh "bacon --automatic --quiet"
 end
+
+
+begin
+  require 'jeweler'
+  Jeweler::Tasks.new do |gemspec|
+    gemspec.name = "opensprints-comm"
+    gemspec.summary = "Wrapper for the opensprints race manager hardware"
+    gemspec.description = "Provides the library for interacting with the arduino firmware and also for mocking it out."
+    gemspec.email = "luke@opensprints.org"
+    gemspec.homepage = "http://github.com/lukeorland/opensprints-comm"
+    gemspec.authors = ["Luke Orland"]
+  end
+rescue LoadError
+  puts "Jeweler not available. Install it with: gem install jeweler"
+end

lib/opensprints-comm.rb

@@ -0,0 +1,38 @@
+class MockFirmware
+  def initialize()
+    @output_stream ||= []
+  end
+
+  def self.open(file, mode)
+    @@mock ||= self.new()
+  end
+
+  def readline
+    @output_stream.pop
+  end
+
+  def write(command)
+    if command =~ /^!a:/
+      number = get_parameter(command)
+      if number.to_i >= 2**16
+        @output_stream << "A:NACK\r\n"
+      else
+        @output_stream << "A:#{number}\r\n"
+      end
+    else
+      @output_stream << "NACK\r\n"
+    end
+  end
+
+  def close
+
+  end
+
+  def flush
+
+  end
+
+  def get_parameter(command)
+    command.gsub(/.*:(.*)\r\n/,'\1')
+  end
+end

test/test_mock_firmware.rb

@@ -0,0 +1,74 @@
+require 'rubygems'
+require 'bacon'
+require 'timeout'
+require 'lib/opensprints-comm'
+include Timeout
+
+filename = ENV['OPENSPRINTS_PORT']||"/dev/ttyUSB0"
+serialport = MockFirmware.open(filename, "w+")
+serialport.flush
+serialport.close
+sleep(1.5)
+
+serialport = MockFirmware.open(filename, "w+")
+serialport.write "!s\r\n"
+serialport.flush
+timeout(0.2) {
+	puts serialport.readline
+}
+
+serialport.close
+
+serialport = MockFirmware.open(filename, "w+")
+
+serialport.write "!defaults\r\n"
+serialport.flush
+timeout(0.2) {
+	puts serialport.readline
+}
+serialport.close
+
+def write_command(command)
+  filename = ENV['OPENSPRINTS_PORT']||"/dev/ttyUSB0"
+  @serialport = MockFirmware.open(filename, "w+")
+  @serialport.write command
+  @serialport.close
+  @serialport = MockFirmware.open(filename, "w+")
+end
+
+def set_to_defaults!
+  write_command("!defaults\r\n")
+
+  timeout(1.1) {
+    @serialport.readline
+  }
+end
+
+def write_stimulus(stimulus)
+  write_command(stimulus)
+  timeout(0.1) {
+    return @serialport.readline
+  }
+end
+
+describe "The handshake" do
+  before do
+    set_to_defaults!
+  end
+  describe "with a number 0-65535" do
+    it "should reply with the given number" do
+      write_stimulus("!a:0\r\n").should==("A:0\r\n")
+      write_stimulus("!a:12345\r\n").should==("A:12345\r\n")
+      write_stimulus("!a:65535\r\n").should==("A:65535\r\n") 
+    end
+  end
+
+  describe "with numbers greater than 65535" do
+    it "should NACK back" do
+			write_command("!a:65536\r\n")
+			timeout(0.1) {
+				@serialport.readline.should==("A:NACK\r\n")
+			}
+    end
+  end
+end