ESP8266 Community Forum

- Fri Jul 31, 2015 10:31 am #24708 Hello, I need to connect to my server on PC (socket connection) after initialization of WiFi connection.

For now I have 2 files:

init.lua

Code: Select allwifi.setmode(wifi.STATION)
wifi.sta.config("mySSID","myPassword")

socket.lua

Code: Select allsk=net.createConnection(net.TCP, 0)
sk:on("receive", function(sck, c) print(c) end )
sk:connect(7171,"54.325.231.532")
sk:send("test123")
print('done')

I want to run socket.lua automatically after connection to the WiFi Hotspot has been established.

I've tried to modify this example code:

Code: Select all-- choose the strongest open AP available and connect to it
-- Autoconnect to strongest AP
-- tested with NodeMcu 0.9.2 build 20141212

ConnStatus = nil
function ConnStatus(n)

status = wifi.sta.status()
uart.write(0,' '..status)
local x = n+1
if (x < 50) and ( status < 5 ) then
   tmr.alarm(0,100,0,function() ConnStatus(x) end)
else
   if status == 5 then
   print('\nConnected as '..wifi.sta.getip())
   else
   print("\nConnection failed")
   end
end
end
   
best_ssid = nil
function best_ssid(ap_db)

local min = 100
for k,v in pairs(ap_db) do
    if tonumber(v) < min then
       min = tonumber(v)
       ssid = k
       end
    end
end

best = nil
function best(aplist)

ssid = nil
print("\nAvailable Open Access Points:\n")
for k,v in pairs(aplist) do print(k..' '..v) end

ap_db = nil
ap_db = {}
if nil ~= next(aplist) then
     
   for k,v in pairs(aplist) do
      if '0' == string.sub(v,1,1) then
         ap_db[k] = string.match(v, '-(%d+),')
         end
       end
     
   if nil ~= next(ap_db) then
      best_ssid(ap_db)
      end
   end
if nil ~= ssid then
   print("\nBest SSID: ".. ssid)
   wifi.sta.config(ssid,"")
   print("\nConnecting to "..ssid)
   ConnStatus(0)
else
   print("\nNo available open APs")
   end
end
   

wifi.setmode(wifi.STATION)
wifi.sta.getap(function(t) best(t)  end)


Modified:

Code: Select allConnStatus = nil
function ConnStatus(n)

status = wifi.sta.status()
uart.write(0,' '..status)
local x = n+1
if (x < 50) and ( status < 5 ) then
   tmr.alarm(0,100,0,function() ConnStatus(x) end)
else
   if status == 5 then
   print('\nConnected as '..wifi.sta.getip())
   dofile("socket.lua")
   else
   print("\nConnection failed")
   end
end
end

wifi.setmode(wifi.STATION)
wifi.sta.config("mySSID","myPassword")
ConnStatus(0)


It works, however sometimes the connection to the server lasts for only few seconds. It must stay alive all the time.

Any ideas?

Thanks in advance,
Defozo

- Wed Aug 05, 2015 6:15 am #25076 I am having the same issue - any help would be appreciated...