nodemcu lua websocket aws

credentials.lua

-- Credentials
SSID = ""
PASSWORD = ""

init.lua

-- load credentials, 'SSID' and 'PASSWORD' declared and initialize in there
dofile("credentials.lua")

function startup()
    if file.open("init.lua") == nil then
        print("init.lua deleted or renamed")
    else
        print("Running")
        file.close("init.lua")
        -- the actual application is stored in 'application.lua'
        -- dofile("application.lua")
    end
end

-- Define WiFi station event callbacks
wifi_connect_event = function(T)
  print("Connection to AP("..T.SSID..") established!")
  print("Waiting for IP address...")
  if disconnect_ct ~= nil then disconnect_ct = nil end
end

wifi_got_ip_event = function(T)
  -- Note: Having an IP address does not mean there is internet access!
  -- Internet connectivity can be determined with net.dns.resolve().
  print("Wifi connection is ready! IP address is: "..T.IP)
  print("Startup will resume momentarily, you have 3 seconds to abort.")
  print("Waiting...")
  tmr.create():alarm(3000, tmr.ALARM_SINGLE, startup)
  
  local verify = tls.cert.verify([[
  -----BEGIN CERTIFICATE-----
  -----END CERTIFICATE-----
  ]])
  print('verify', verify)

  local ws = websocket.createClient()
  ws:on("connection", function(ws)
    print('got ws connection')
  end)
  ws:on("receive", function(_, msg, opcode)
    print('got message:', msg, opcode) -- opcode is 1 for text message, 2 for binary
    -- gpio.write(16, msg ? gpio.HIGH : gpio.LOW)
  end)
  ws:on("close", function(_, status)
    print('connection closed', status)
    ws = nil -- required to Lua gc the websocket client
  end)
  ws:connect('wss://7mortnucx4.execute-api.us-east-2.amazonaws.com/prod/')  
  -- ws:connect('ws://192.168.1.40:8080')  

  sntp.sync("pool.ntp.org",
    function(sec, usec, server, info)
      print('sync', sec, usec, server)
    end,
    function()
    print('failed!')
  end
)
end

wifi_disconnect_event = function(T)
  if T.reason == wifi.eventmon.reason.ASSOC_LEAVE then
    --the station has disassociated from a previously connected AP
    return
  end
  -- total_tries: how many times the station will attempt to connect to the AP. Should consider AP reboot duration.
  local total_tries = 75
  print("\nWiFi connection to AP("..T.SSID..") has failed!")

  --There are many possible disconnect reasons, the following iterates through
  --the list and returns the string corresponding to the disconnect reason.
  for key,val in pairs(wifi.eventmon.reason) do
    if val == T.reason then
      print("Disconnect reason: "..val.."("..key..")")
      break
    end
  end

  if disconnect_ct == nil then
    disconnect_ct = 1
  else
    disconnect_ct = disconnect_ct + 1
  end
  if disconnect_ct < total_tries then
    print("Retrying connection...(attempt "..(disconnect_ct+1).." of "..total_tries..")")
  else
    wifi.sta.disconnect()
    print("Aborting connection to AP!")
    disconnect_ct = nil
  end
end

-- Register WiFi Station event callbacks
wifi.eventmon.register(wifi.eventmon.STA_CONNECTED, wifi_connect_event)
wifi.eventmon.register(wifi.eventmon.STA_GOT_IP, wifi_got_ip_event)
wifi.eventmon.register(wifi.eventmon.STA_DISCONNECTED, wifi_disconnect_event)

print("Connecting to WiFi access point...")
wifi.setmode(wifi.STATION)
wifi.sta.config({ssid=SSID, pwd=PASSWORD})
-- wifi.sta.connect() not necessary because config() uses auto-connect=true by default

-- gpio.mode(16, gpio.OUTPUT)