Ruby SSL Socket connection with self signed client certificate. For https://medium.com/@pavelevstigneev/setting-nginx-with-letsencrypt-and-client-ssl-certificates-3ae608bb0e66

connect.rb

tcp_socket = Socket.tcp("mysite.com", 32500, connect_timeout: 60)
ssl_context = OpenSSL::SSL::SSLContext.new()

ssl_context.client_cert_cb = Proc.new do
  [
    OpenSSL::X509::Certificate.new(File.open("./client.crt")),
    OpenSSL::PKey.read(File.open("./client.key"))
  ]
end

ssl_context.verify_callback = Proc.new do |passed, store_context|
  if !passed
    puts "SSL Verification Error: #{store_context.error} - #{store_context.error_string}"
  end
end

ssl_socket = OpenSSL::SSL::SSLSocket.new(tcp_socket, ssl_context)

ssl_socket.connect