-- MQTT connect script with deep sleep
-- Remember to connect GPIO16 and RST to enable deep sleep

--- MQTT ---
mqtt_broker_ip = "10.42.1.101"     
mqtt_broker_port = 1883
mqtt_username = ""
mqtt_password = ""
mqtt_client_id = "therm1"
mqtt_prefix = "maison/bureau"

--- WIFI ---
wifi_cfg = {}
wifi_cfg.ssid = "FLRLAN"
wifi_cfg.pwd  = "XXXXX"

client_ip=""
client_netmask=""
client_gateway=""

dht22_pin = 4

--- INTERVAL ---
time_between_sensor_readings = 120000

-- Setup MQTT client and events
m = mqtt.Client(mqtt_client_id, 120, mqtt_username, mqtt_password)

-- Connect to the wifi network
wifi.setmode(wifi.STATION)
wifi.sta.config(wifi_cfg)

if client_ip ~= "" then
    wifi.sta.setip({ip=client_ip,netmask=client_netmask,gateway=client_gateway})
end

-- DHT22 sensor logic
function get_sensor_data()
    local status, temp, humi, temp_dec, humi_dec = dht.read(dht22_pin)
    if status == dht.OK then
        local temp_str = string.format("%d.%03d", math.floor(temp), temp_dec);
        local humi_str = string.format("%d.%03d", math.floor(humi), humi_dec);
        print(string.format("DHT Temperature:%s ;Humidity:%s\r\n", temp_str, humi_str))
        return temp_str, humi_str
    elseif status == dht.ERROR_CHECKSUM then
        print( "DHT Checksum error." )
        return nil, nil
    elseif status == dht.ERROR_TIMEOUT then
        print( "DHT timed out." )
        return nil, nil
    end
end

function loop()
    if wifi.sta.status() == 5 then
        print("Connected with " .. wifi.sta.getip())
        -- Stop the loop
        tmr.stop(0)
        m:connect( mqtt_broker_ip , mqtt_broker_port, 0, function(conn)
            print("Connected to MQTT")
            print("  IP: ".. mqtt_broker_ip)
            print("  Port: ".. mqtt_broker_port)
            print("  Client ID: ".. mqtt_client_id)
            print("  Username: ".. mqtt_username)
            -- Get sensor data
            local temperature, humidity = get_sensor_data()
            m:publish(mqtt_prefix .. "/temperature", temperature, 0, 0, function(conn)
                m:publish(mqtt_prefix .. "/humidity", humidity, 0, 0, function(conn)
                    print("Going to deep sleep for "..(time_between_sensor_readings/1000).." seconds")
                    node.dsleep(time_between_sensor_readings*1000)             
                end)          
            end)
        end )
    end
end

tmr.alarm(0, 100, 1, function() loop() end)