require "rmodbus"
require "ccutrer-serialport"

controller_id = ARGV[0]&.to_i
value = ARGV[1]&.to_i

ModBus::RTUClient.new("/dev/ttyUSB0", 9600) do |cl|
  cl.with_slave(controller_id) do |slave|
    regs = slave.holding_registers
    regs[22] = value
    sleep 0.1
  end
end