-- Config SSID = "ssid_name" PASS = "ssid_pass"

MQTT_TEMP_TOPIC = "/sensors/study/temperature" MQTT_HOST = "server IP" MQTT_PORT = 1883 MQTT_CLIENT_ID = "esp2866_study" MQTT_USER = "" MQTT_PASS = "" MQTT_RECONNECT = 1 MQTT_SECURE = 0

-- TMP102 settings TMP102_ID = 0 TMP102_SDA = 6 TMP102_SCL = 7 -- Allow correcting temperatures by subtracting this TMP102_BIAS = 0

-- Number of seconds to wait for a wifi connection before restarting MAX_RETRIES = 20

-- Measurement interval (ms) TEMP_INTERVAL = 10000

function wifi_connect(ssid, pass) wifi.setmode(wifi.STATION) wifi.sta.config(ssid, pass)

local wifi_count = 0

tmr.alarm(0, 1000, 1, function()
    wifi_status =  wifi.sta.status()
    if wifi_status ~= 5 then
        wifi_count = wifi_count + 1

        if wifi_count >= MAX_RETRIES then
            print("Failed to connect. Restarting")
            node.restart()
        end

        print("Not yet connected.")
    else
        ip, mask, gateway = wifi.sta.getip()
        print("Connected")
        print("IP address: ", ip)
        print("Netmask:    ", mask)
        print("Gateway:    ", gateway)
    tmr.stop(0)
    mqtt_setup()
    end
end) -- end of alarm function

end

function mqtt_setup() local mqtt_connection = 0

-- Connect to the MQTT broker
mqtt = mqtt.Client(MQTT_CLIENT_ID, 120, MQTT_USER, MQTT_PASS)
mqtt:connect(MQTT_HOST, MQTT_PORT, MQTT_SECURE, MQTT_RECONNECT)

mqtt:on("connect", function(client)

    print("Connected to MQTT server")
    mqtt_connection = 1

-- Load the TMP102 module
tmp102=dofile("tmp102.lua")
    tmp102.begin(TMP102_ID, TMP102_SDA, TMP102_SCL)

    tmr.alarm(0, TEMP_INTERVAL, 1, function()
        temp=tmp102.celcius() - TMP102_BIAS
        print("Read temperature from TMP102: ", temp)
        mqtt:publish(MQTT_TEMP_TOPIC, temp, 0, 0)
    end)
end)

-- TODO: reconnection logic if auto-reconnect fails
mqtt:on("offline", function(client)
    print("Lost connection to MQTT server")
    mqtt_connection = 0
end)

end

function main()

-- Connect to the network
wifi_connect(SSID, PASS)

end

-- Run the main function main()