client = mqtt.client("ESP32", "192.168.0.11", 1883, false)
client:connect("","")

function printMaster(length, msg)
  console("[MASTER]"..msg)
end

function printAlt(length, msg)
  console("[ALT]"..msg)
end

max_temp = 0 
min_temp = 100
max_place = ""
min_place = ""

function printBuildingTemp(length, msg)
  local temp_str, place = pack.unpack(msg)
  local temp = tonumber(temp_str)
  if temp > max_temp then
    max_temp = temp 
    max_place = place 
  end
  if temp < min_temp then
    min_temp = temp 
    min_place = place 
  end
  console("Max : ["..max_place.."] "..max_temp)
  console("Min : ["..min_place.."] "..min_temp)
end

function sendTemp()
  s = sensor.attach("DHT22", pio.GPIO21)
	tmr.delayms(500)
  while true do
    client:publish("Building/temp", pack.pack(s:read("temperature"), "Salon"), mqtt.QOS0)
    tmr.delayms(5000)
  end
end

client:subscribe("MASTER", mqtt.QOS0, printMaster)
client:subscribe("ALT", mqtt.QOS0, printAlt)
-- client:publish("MASTER", "Hello, world!", mqtt.QOS0)
-- client:publish("ALT", "Hello, world!", mqtt.QOS0)

temp_sender = thread.start(sendTemp)
client:subscribe("Building/temp", mqtt.QOS0, printBuildingTemp)