Fox Delta ST2 emulator

st2emu.rb

#!/usr/bin/env ruby
#
# st2emu.rb - Fox Delta ST2 emulator
# 2026-05-23 by JH4XSY/1
#
# このエミュレータは、仮想的なシリアルポートを作成し、軌道計算ソフトに、送られてきたAz,Elの値を返します。

require 'pty'
require 'fileutils'

LINK_PATH = "/tmp/ttyV0"

def start_emulator
  PTY.open do |master, slave|
    FileUtils.rm_f(LINK_PATH)
    File.symlink(slave.path, LINK_PATH)

    puts "=== ST2 Emulator v0.1 by JH4XSY/1 ==="
    puts "Assigned Rotator Device: #{LINK_PATH}"
    
    current_az, current_el = 0.0, 0.0

    loop do
      if IO.select([master], nil, nil, 1)
        begin
          line = master.gets
          next if line.nil?
          command = line.strip.upcase
          
          # 1. 方位角(AZ)の解析
          if command =~ /AZ\s*([\d\.]+)/
            current_az = $1.to_f
          end

          # 2. 仰角(EL)の解析
          if command =~ /EL\s*([\d\.]+)/
            current_el = $1.to_f
          end

          # 3. ステータス要求に対する応答
          if command.include?("C")
            response = sprintf("%+07.1f%+07.1f\r\n", current_az, current_el)
            
            master.write(response)
          end

          output = "\rGot Az=#{sprintf('%5.1f', current_az)} El=#{sprintf('%4.1f', current_el)} | Feedback: #{response}\e[K"
          print output

        rescue Errno::EIO
          # ソフト側がポートを閉じた場合
          sleep 1
        end
      end
    end
  end
ensure
  FileUtils.rm_f(LINK_PATH)
end

start_emulator