client.rb

require 'socket'

def open(id)
  fn = "/sys/class/gpio/gpio#{id}/direction"  
  File.write('/sys/class/gpio/export', id) unless File.exist?(fn)
  File.write(fn, "out")
end

def pin(id, value)
  fn = "/sys/class/gpio/gpio#{id}/value"
  File.write(fn, value) if File.exist?(fn)
end

GPIO = 0
TOKEN = "DEVIDE_ID,DEVIDE_TOKEN"
PING = TOKEN + ",0"

open(GPIO)

socket = TCPSocket.new("SERVER", 443)
socket.puts(PING)
p socket.read(PING.size)

puts "START"

buffer = ""
cmd = ""
pointer = 0
data = false

loop do
  ret = socket.read(1)
  buffer << ret
  pos = buffer.index(TOKEN)
  if pos == 0
    buffer = buffer[TOKEN.size..-1] 
  end

  if buffer.count(",") == 3
    p buffer
    buffer = ""
    ctrl = socket.read(1)
    pin(GPIO, ctrl.to_i)
  end
end

socket.close