BROKER = "172.16.2.15" 
BRPORT = 1883
BRUSER = ""
BRPWD  = "" 
CLIENTID = "ESP8266-" ..  node.chipid()

SWITCH_PIN = 3

SWITCH_ID = 1

topics = {"IoT/Watchdog", "IoT/Switch" .. SWITCH_ID} 
TOPIC_WATCHDOG = 1
TOPIC_SWITCH = 2

pub_sem = 0 
current_topic  = 1
topicsub_delay = 50 
id2 = 0

switch_state = false
old_switch_state = true


function alarm()
  node.restart()
end


gpio.mode(SWITCH_PIN, gpio.OUTPUT)
gpio.write(SWITCH_PIN, gpio.LOW)

m = mqtt.Client( CLIENTID, 120, BRUSER, BRPWD)
tmr.alarm(4, 60000, 1, alarm)
m:connect( BROKER , BRPORT, 0, function(conn)
     print("4")
     mqtt_sub()
end)




function mqtt_sub()
     if table.getn(topics) < current_topic then
          run_main_prog()
     else
          m:subscribe(topics[current_topic] , 0, function(conn)
          end)
          current_topic = current_topic + 1 
          tmr.alarm(5, topicsub_delay, 0, mqtt_sub )
     end
end


function publish_status()
   if pub_sem == 0 then 
     pub_sem = 1
     local uptime = tmr.time()
     local switch_state_pres = 0
     if (switch_state) then
        switch_state_pres = 1
     end
     local msg = "{\"metadata\":{\"device\":\"WiFiSwitch" .. SWITCH_ID .. "\"}, \"data\":{\"uptime\":" .. uptime .. ", \"state\":" .. switch_state_pres .. "}}"
     m:publish("IoT/Status/WiFiSwitch" .. SWITCH_ID, msg ,0,0, function(conn) 
        print("8: " .. id2 .. ", " .. switch_state_pres)
        pub_sem = 0 
        id2 = id2 +1 
     end)
   end  
end



function run_main_prog()
     tmr.alarm(3, 1000, 1, publish_status )
     m:on("message", function(conn, topic, data)
        print(topic .. ":" )
        if (data ~= nil ) then
          print ( data )
          if (topic == topics[TOPIC_SWITCH] and data == "switch on") then
            switch_state = true
          elseif (topic == topics[TOPIC_SWITCH] and data == "switch off") then
            switch_state = false
          elseif (topic == topics[TOPIC_SWITCH] and data == "switch toggle") then
            switch_state = not switch_state
          elseif (topic == topics[TOPIC_WATCHDOG] and data == "WauWau!") then
            print("9")
            tmr.alarm(4, 60000, 1, alarm)
          end

          if (switch_state ~= old_switch_state) then
            old_switch_state = switch_state
            if (switch_state) then
              gpio.write(SWITCH_PIN, gpio.LOW)
            else
              gpio.write(SWITCH_PIN, gpio.HIGH)
            end
          end
        end
      end )
end