ESP8266 Community Forum

Hi

For my current project i need stable communication between two ESP8266 modules. Basicly i want to send every second or maybe faster measurements data from remote location.

I've already done some coding but its not working as it should be, beacause after a while server module is not receiving any data at all. It worked maybe 5 minutes.

Server side:


Client side:


Any thoughts are welcome.

I've managed to get this working. It's working very well but i have not tested it on longer ranges then few meters though.

I have no idea why but even if I set timeout to 28800 on server and send data every second, the client disconnects from server for no reason after some time. Therefore I've written simple function that reconnect's automatically after the connection is lost.

So, here's the code. Maybe someone will find it useful for his own project

SERVER:


CLIENT:


To send data to server I'm using atmega8 like this:




I'm using # to send information to atmega about the current connection status so you may skip this one.

Thanks for the great firmware

I was just thinking about this. A serial-wifi-wifi-serial connection might come in handy sometimes for certain things. Did you solve the disconnect problem yet?

archivi wrote:I've managed to get this working. It's working very well but i have not tested it on longer ranges then few meters though.

I have no idea why but even if I set timeout to 28800 on server and send data every second, the client disconnects from server for no reason after some time. Therefore I've written simple function that reconnect's automatically after the connection is lost.

So, here's the code. Maybe someone will find it useful for his own project

SERVER:

Code: Select allprint("configuring ap")

wifi.setmode(wifi.STATIONAP)
cfg={}
cfg.ssid="WS"
cfg.pwd="12345678"
wifi.ap.config(cfg)

print("config TCP server")
server = net.createServer(net.TCP,28800)
server:listen(80, function(conn)
     conn:on("receive",function(conn,data)
          print(data)
         
     end)
     conn:on("sent",function(conn)
          collectgarbage()
     end)
          conn:on("connection",function(conn)
          print("Connected")
     end)
end)
print("done")



CLIENT:

Code: Select all--------- SETTINGS ---------
SSID="WS"
PWD="12345678"
----------------------------
---------- VARIABLES --------
conn_flag = 0
--------- FUNCTIONS --------
function connect_wifi(ssid,pwd)
if (conn_flag == 0) then
     print("Waiting for connection...")
     print("#1")
else
     print("Reconnecting...")
     print("#1")
end
timer1=0
wifi.setmode(wifi.STATION)
wifi.sta.config(ssid,pwd)
wifi.sta.connect()
tmr.alarm(1,1000,1,function()
     if(wifi.sta.getip()~=nil) then
          tmr.stop(1)
          print("Connected to:", SSID)
          print("IP:",wifi.sta.getip())
          print("MAC:",wifi.sta.getmac())
          conn_flag = 1
     elseif(timer1==10) then
          print("Unable to connect to:",SSID)
          tmr.stop(1)
     end
end)
end

function connect_tcp()
tmr.alarm(2,1000,1,function() 
        sk = net.createConnection(net.TCP, 0) 
        sk:on("receive", function(sk, receivedData)
            print("received: " .. receivedData)
        end)
        sk:on("connection", function(sk)
               print("Connected!")
               print("#2")
               tmr.stop(2)
        end )
        sk:on("disconnection", function(sk)
               print("Disconnected!")
               print("#0")
               connect_wifi(SSID,PWD)
               connect_tcp()
        end )
        sk:connect(80, "192.168.4.1") -- server ESP IP
    collectgarbage()
end)
end
function send(data)
sk:send(data)
end

----------------------------

connect_wifi(SSID,PWD)
connect_tcp()



To send data to server I'm using atmega8 like this:

Code: Select allvoid send_wifis(char *s){
   uart_puts("send(\"");
   uart_puts(s);
   uart_puts("\")\n\r");

}

void send_wifilong(uint32_t liczba){
   uart_puts("send(\"");
   uart_putlong(liczba,10);
   uart_puts("\")\n\r");
}

Code: Select allprint("#2")

I'm using # to send information to atmega about the current connection status so you may skip this one.

Thanks for the great firmware

hey I am doing the same thing I can establish communication between 2 esps but I want to upload I file from esp client to server.
How to upload a file in nodemcu firmware using lua. please help me out