ESP8266 Community Forum

Hello,

I don't know if this is the correct place to ask, but i have an issue and i hope to get some help. I have two ESPs which i use in my project, one is configured to be AP and Server, and the other one is client. The server starts with ip: 192.168.4.1 and deliver a webpage, tested with my smartphone, but when i try to make a request from the other esp, when connecting to host fails. I do following steps:

- connecting to wifi AP - successfully
- preparing data (DHT22)
- creating string and request header
- checking connection to host

IPAddress host(192,168,4,1);

if (client.connect(host, 80)){
it never gets here
do something ...
}

So from my phone, when i access ip in browser, works fine, here it does not. Any ideeas?
Btw i use two ESP8266-01 with standard firmware, arduino code.

Is your second ESP in STA-only mode ?
If both ESP are in STA+AP, you will get conflicting IPs with 192.168.4.1, since the client will try to connect to itself instead of trying to connect to the other ESP.

the one which is server is STA+AP, but on the client i did not configured specific mode, i just used wifi.begin(ssid, pass), do it connects successfully to the server, it cannot open the connection with its ip. I will try to specifi ST only in the client just to exclude your statement. Thanks

For the client, to avoid IP conflict, simply force STA-only mode by using WiFi.mode(WIFI_STA); before the WiFi.begin();