Haier air conditioner

[admin]

Example of sending data packets:

Code:

port = require('serial').open('/dev/ttyUSB0', { baudrate = 9600 })

function send(...)
  local data = string.char(...)
  local len = #data + 1
  local hdr = string.char(0xFF, 0xFF, len)
  local csum = len

  for _, byte in ipairs({ ... }) do
    csum = bit.band(csum + byte, 0xFF)
  end

  local pkt = hdr .. data .. string.char(csum)
  port:write(pkt)
end

send(0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x4D, 0x02) -- turn on
send(0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x4D, 0x03) -- turn off
send(0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x4D, 0x01) -- request state