MQTT	  		= 	require("mosquitto")
mqtt 	  		= 	MQTT.new()

local function errLog(msg)
	io.stderr:write(msg)
end

local connected = false
local broker	= "localhost" 

local onMessage	= nil
local onConnect = nil

local function publish(topic,msg,retain)
    retain = retain or false
	mqtt:publish(topic,msg, qos, retain)
end

local function loop()
	local ok,err,msg

	if connected then
		ok,err,msg = mqtt:loop(0)
		if not ok then
			errLog("MQTT:\t "..msg.."\n")
			if onError then onError(1) end
			connected = false
		end 
	else		
		ok,err,msg = mqtt:loop(0)
		if not ok then
			if onError then onError(2) end
			errLog("MQTT:\t "..msg.."\n")
			mqtt:connect(broker,1883,5)
			errLog("MQTT:\t Reconnect".."\n")
		end 
	end
end

local function subscribe(msg)
	mqtt:subscribe(msg)
end

mqtt.ON_CONNECT = function()
	connected = true
	if onConnect then onConnect() end
end

mqtt.ON_MESSAGE = function(mid, topic, payload)
	if onMessage then onMessage(mid, topic, payload) end
end

local function begin(hostname) 
	broker = hostname
	mqtt:connect(broker,1883,5)
end

return {
	begin			=	begin;
	loop			=	loop;
	publish			=	publish;
	subscribe		=   subscribe;
	onConnect		=	function(callback) onConnect = callback end;	
	onMessage		=	function(callback) onMessage = callback end;
	onError		    =	function(callback) onError   = callback end;	
}