ESP8266 Wifi P2P with Arduino

Question

I am fairly new to using the ESP8266 and trying to get two of them to connect directly via the wifi generated by the server. For now, I am using two Arduino Unos, one for each wifi module. I am sending the ESP8266 AT commands from the Serial Monitor. I have one ESP8266 dedicated to being a server and the other as a client. My goal is to send a simple message from the client to the server without connecting to any external wifi. Here is the series of AT commands I am using in the Arduino Serial Monitor.

Server code:

INPUT:  AT+CWSAP="ESP SSID","ESP PASSWORD",2,3
OUTPUT: OK
INPUT:  AT+CWMODE=3
OUTPUT: OK
INPUT:  AT+CIPMUX=1
OUTPUT: OK
INPUT:  AT+CIPSERVER=1,80
OUTPUT: no change 
        OK
INPUT:  AT+CIFSR
OUTPUT: +CIFSR:APIP,"192.168.4.1"
        +CIFSR:APMAC,"2e:3a:e8:20:f9:96"
        +CIFSR:STAIP,"0.0.0.0"
        +CIFSR:STAMAC,"2c:3a:e8:20:f9:96"

Client Code:

INPUT:  AT+CWMODE=3
OUTPUT: OK
INPUT:  AT+CJAP="ESP SSID","ESP PASSWORD"
OUTPUT: WIFI CONNECTED
        WIFI GOT IP
INPUT:  AT+CIPMUX=1
OUTPUT: OK
INPUT:  AT+CIPSTART=2,"TCP","192.168.4.1",80
OUTPUT: ERROR
        2,CLOSED

I cannot figure out why I am getting this error when trying to start a connection with the server. I am aware of the thread Communication between 2 ESP8266 WiFi modules without router using AT commands but none of these solutions have fixed this error.

I have also swapped the original ESP8266s with 2 new ones, which did not solve the problem. In addition, I have been able to communicate with these wifi modules using a smartphone with a TCP client app, so I don't think any of my hardware is broken. Thank you for any suggestions and help.

why not program the ESPs? it's 100X easier to do complex things when you can debug the internals. — dandavis
– dandavis, Commented Feb 1, 2018 at 21:37

D. M. · Accepted Answer · 2018-02-02 16:20:20Z

1

After some extreme trial and error, I got the connection to work. After manually setting the IP address of the client using

AT+CIPSTA="192.168.4.2"

the connection could be made using the AT commands above. I guess the client needs to contain the same first three parts of the IP address as the server. I'm not sure if I'm just a noob that should know about this IP address nomenclature, but here is an official answer to help others with the same problem. Good luck!

answered Feb 2, 2018 at 16:20

D. M.

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