ESP8266 NodeMcu SMS (Text Message)

eps8266_sms_nodemcu.lua

-- Your access point's SSID and password
local SSID = "xxxxxx"
local SSID_PASSWORD = "xxxxxx"

-- configure ESP as a station
wifi.setmode(wifi.STATION)
wifi.sta.config(SSID,SSID_PASSWORD)
wifi.sta.autoconnect(1)

local TWILIO_ACCOUNT_SID = "xxxxxx"
local TWILIO_TOKEN = "xxxxxx"

local HOST = "iot-https-relay.appspot.com" 
local URI = "/twilio/Messages.json"

function build_post_request(host, uri, data_table)

     local data = ""
     
     for param,value in pairs(data_table) do
          data = data .. param.."="..value.."&"
     end

     request = "POST "..uri.." HTTP/1.1\r\n"..
     "Host: "..host.."\r\n"..
     "Connection: close\r\n"..
     "Content-Type: application/x-www-form-urlencoded\r\n"..
     "Content-Length: "..string.len(data).."\r\n"..
     "\r\n"..
     data

     print(request)
     
     return request
end

local function display(sck,response)
     print(response)
end

-- When using send_sms: the "from" number HAS to be your twilio number.
-- If you have a free twilio account the "to" number HAS to be your twilio verified number.
-- The numbers MUST include the country code.
-- DO NOT add the "+" sign.
local function send_sms(from,to,body)

     local data = {
      sid = TWILIO_ACCOUNT_SID,
      token = TWILIO_TOKEN,
      Body = string.gsub(body," ","+"),
      From = from,
      To = to
     }
     
     socket = net.createConnection(net.TCP,0)
     socket:on("receive",display)
     socket:connect(80,HOST)

     socket:on("connection",function(sck) 
       
          local post_request = build_post_request(HOST,URI,data)
          sck:send(post_request)
     end)     
end

function check_wifi()
 local ip = wifi.sta.getip()

 if(ip==nil) then
   print("Connecting...")
 else
  tmr.stop(0)
  print("Connected to AP!")
  print(ip)
  send_sms("15551234567","12223456789","Hello from your ESP8266") 
 end
 
end

tmr.alarm(0,7000,1,check_wifi)

Miguel ......... I've been looking for years to bring my antiquated alarm system into the 21st century! The Nodemcu has made that possible without the expense of Arduino or Raspberry Pi and leaving everything running 24/7. When the alarm fires and sends 12v, 20 seconds later I have a message on the cell.
Thanks for the lua code and relay,
[http://mlaine.net/alarm-sms.jpg]
Mike