Client cannot connect ESP32 AP in AP-STA Mode #2242

diazadip · 2018-12-25T00:04:25Z

Hardware:

Board: DOIT ESP32 DevKit v1
Core Installation/update date: -
IDE name: Arduino IDE
Flash Frequency:80MHz
PSRAM enabled:-
Upload Speed:115200
Computer OS:Windows 10

Description:

Hi, i'm sorry before for my bad english language.
My name is Diaz, i wanna make smart plug with ESP32. I've done with my ESP8266 Before, but i need more GPIO, so i've change to ESP32.

My problem is when i've change my program to from ESP8266 to ESP32, my phone cannot connect to ESP32 Access Point when my ESP32 is connected to other Access Point (In AP-STA Mode). My phone can connect to ESP32 only in AP Mode. From three device below, only my phone who is cannot connect to my ESP32.

My Phone (Cannot Connected to my ESP32)
My Mother Phone (Can Connected to my ESP32)
My Laptop (Can Connected to my ESP32)

Can anybody help me? i've been googling and still stuck in this problem. why just my phone who cannot connect to ESP32 in AP-STA Mode,

Sketch: I'm cut my sketch because it's too long :)

#include <Arduino.h>
#include "WiFi.h"
void setup()
{
WiFi.mode(WIFI_AP_STA);
WiFi.softAP("TEST-DSP", "12345678");
WiFi.begin("spiderman", "spiderboy");
}

void loop() {
}

Debug Messages:

When my phone trying to connect my ESP32, i got authentication problem and my phone always ask to input password again.

lbernstone · 2018-12-25T00:56:08Z

What type of phone? Turn on logging in Arduino IDE (board-> esp32 dev module, tools -> Core debug level -> Verbose) and post the log.

diazadip · 2018-12-25T01:02:17Z

Hi, thank you for the response, my phone is Xiaomi Redmi 4A. How i can get the log? i've choose the Core debug level Verbose

lbernstone · 2018-12-25T01:39:48Z

Start the serial monitor and upload your code. You will need to add Serial.begin(115200); at the beginning of your sketch.

diazadip · 2018-12-25T01:59:20Z

owh, yes, in my code has serial begin :D , but i can't get any log except the serial message in my script.

SSID_AP Sudah Ada
PASS_AP Sudah Ada
SSID_AP : TEST-DSP
PASS_AP : 12345678
SSID_WIFI : spiderman
PASS_WIFI : spiderboy
IP Address : 0.0.0.0
Soft AP Ip Address : 192.168.19.10
MAC Address : 3C:71:BF:4D:67:28
Wifi Not Connected
Wifi Not Connected
Wifi Not Connected
Wifi Not Connected

when i stop get message "Wifi Not Connected", thats mean ESP32 has connected to some access point.

lbernstone · 2018-12-25T03:03:53Z

Upload the exact code above with a Serial.begin. This is clearly not what is on your device.

diazadip · 2018-12-25T05:12:23Z

Here my void setup code :)

WiFi.mode(WIFI_AP_STA);

pinMode(ch1, OUTPUT);
pinMode(ch2, OUTPUT);
pinMode(ch3, OUTPUT);
pinMode(ch4, OUTPUT);

Serial.begin(115200);
EEPROM.begin(512);

esp_read_mac(mac_addr, ESP_MAC_WIFI_STA); str_mac_addr5 = String(mac_addr[4], HEX); str_mac_addr6 = String(mac_addr[5], HEX);

if(EEPROM.read(1) != 0){Serial.println("SSID_AP Sudah Ada");}
else
{
str_mac_addr = "DSP-" + str_mac_addr5 + str_mac_addr6;
str_mac_addr.toCharArray(ssid_ap,15);
Serial.println("Menulis SSID_AP Baru");
for(int x=1; x<16; x++){int ssid_ap_addr = x - 1; EEPROM.write(x, ssid_ap[ssid_ap_addr]);} EEPROM.commit();
}

if(EEPROM.read(21) != 0){Serial.println("PASS_AP Sudah Ada");}
else{Serial.println("Menulis PASS_AP Baru"); for(int x=21; x<36; x++){int pass_ap_val = x + 28; if(x < 29) {EEPROM.write(x, pass_ap_val);} else{EEPROM.write(x, 0);} EEPROM.commit();}}

read_eeprom();

WiFi.softAPConfig(AP_local_IP, AP_gateway, AP_subnet);
WiFi.softAP(ssid_ap);//, pass_ap);
WiFi.begin(ssid_wifi, pass_wifi);
server.begin();

get_ip();
print_info();

Maybe you need to know function get_ip and print_info, i upload too :)

void get_ip()
{
str_ip_addr = WiFi.localIP().toString();
str_ip_addr.toCharArray(ip_addr,15);
for(int x=81; x<96; x++){int ip_addr_addr = x - 81; EEPROM.write(x, ip_addr[ip_addr_addr]); EEPROM.commit();}
for(int x=81; x<96; x++){int ip_addr_addr = x - 81; int val_eeprom = EEPROM.read(x); /if(val_eeprom == 0){val_eeprom = 32;}/ip_addr[ip_addr_addr] = (char(val_eeprom));}
}

void print_info()
{
Serial.print("SSID_AP : ");
Serial.println(ssid_ap);
Serial.print("PASS_AP : ");
Serial.println(pass_ap);
Serial.print("SSID_WIFI : ");
Serial.println(ssid_wifi);
Serial.print("PASS_WIFI : ");
Serial.println(pass_wifi);
Serial.print("IP Address : ");
Serial.println(ip_addr);
Serial.print("Soft AP Ip Address : ");
Serial.println(WiFi.softAPIP());
Serial.print("MAC Address : ");
Serial.println(WiFi.macAddress());
}

lbernstone · 2018-12-25T17:28:02Z

If you want help, you need to do as asked. Upload the following code (with verbose logging enabled) and post the log:

#include "WiFi.h"

void setup() {
Serial.begin(115200);
WiFi.mode(WIFI_AP_STA);
WiFi.softAP("TEST-DSP", "12345678");
WiFi.begin("spiderman", "spiderboy");
}
void loop() {}

diazadip · 2018-12-25T21:54:17Z

Hi, this is my log

[D][WiFiGeneric.cpp:345] _eventCallback(): Event: 13 - AP_START
[D][WiFiGeneric.cpp:345] _eventCallback(): Event: 13 - AP_START
[D][WiFiGeneric.cpp:345] _eventCallback(): Event: 0 - WIFI_READY
[D][WiFiGeneric.cpp:345] _eventCallback(): Event: 4 - STA_CONNECTED
[D][WiFiGeneric.cpp:345] _eventCallback(): Event: 7 - STA_GOT_IP
[D][WiFiGeneric.cpp:389] _eventCallback(): STA IP: 192.168.0.2, MASK: 255.255.255.0, GW: 192.168.0.1

When i try to connect my phone, i got this log

[D][WiFiGeneric.cpp:345] _eventCallback(): Event: 15 - AP_STACONNECTED

But, when i try to connect my laptop and connected, i got log like this

[D][WiFiGeneric.cpp:345] _eventCallback(): Event: 15 - AP_STACONNECTED
[D][WiFiGeneric.cpp:345] _eventCallback(): Event: 17 - AP_STAIPASSIGNED

me-no-dev · 2018-12-26T10:56:47Z

the fact that when the phone connects you do not see AP_STAIPASSIGNED means that dhcp between the two is not working correctly. You could try and use WireShark to look at the network traffic and obtain a log. If you feel capable, install wireshark on your computer and start capture once it is connected to the ESP. Then try to connect the phone and stop capture once it fails. You can post the capture here and we can have a look deeper into what could be happening.

copercini · 2018-12-26T11:49:04Z

Try to do an esptool.py erase_flash and load the firmware again, just to be sure before go deeper

diazadip · 2018-12-26T13:46:15Z

Try to do an esptool.py erase_flash and load the firmware again, just to be sure before go deeper

Hi, i've tried but with "flash download tool", but still stuck :(. maybe tomorrow i'll try with esptool.py :D

diazadip · 2018-12-26T13:47:37Z

the fact that when the phone connects you do not see AP_STAIPASSIGNED means that dhcp between the two is not working correctly. You could try and use WireShark to look at the network traffic and obtain a log. If you feel capable, install wireshark on your computer and start capture once it is connected to the ESP. Then try to connect the phone and stop capture once it fails. You can post the capture here and we can have a look deeper into what could be happening.

Okee, maybe tomorrow i'll try info about wireshark :D thank you for the suggestion

diazadip · 2018-12-26T23:08:22Z

Try to do an esptool.py erase_flash and load the firmware again, just to be sure before go deeper

Hi, i've tried but with "flash download tool", but still stuck :(. maybe tomorrow i'll try with esptool.py :D

Today i've try to erase flash with esptool but still stuck in same problem :(

diazadip · 2018-12-27T22:52:39Z

the fact that when the phone connects you do not see AP_STAIPASSIGNED means that dhcp between the two is not working correctly. You could try and use WireShark to look at the network traffic and obtain a log. If you feel capable, install wireshark on your computer and start capture once it is connected to the ESP. Then try to connect the phone and stop capture once it fails. You can post the capture here and we can have a look deeper into what could be happening.

Hi, today i've try to use wireshark and got this log.

And this is my description

192.168.19.11 is my laptop IP Address
192.168.19.10 is ESP AP IP Address
192.168.19.1 is ESP AP Gateway

May be you can help me again? :)

lbernstone · 2018-12-27T22:56:49Z

Google "troubleshoot dhcp with wireshark"
https://www.lovemytool.com/blog/2013/09/troubleshooting-dhcp-with-wireshark-by-tony-fortunato.html

mouridis · 2019-01-02T06:14:47Z

Since other devices connect with no problem and only your Xiaomi phone has problem to connect, it seems we are debugging your phone and not arduino-esp32 or your sketch.

Make sure there is nothing setup or running on your phone that could possibly interfere with DHCP (no tethering of any kind like wifi hotspot or bluetooth tethering, no VPN setup or VPN app active, no network security apps etc). Also make sure that "DHCP / obtain IP automatically" or whatever the option is called in Xiaomi's MIUI is enabled for your ESP32 SSID.

Also consider restoring factory defaults on your phone and retrying... (make sure you backup your phone first)

diazadip · 2019-01-02T15:28:27Z

Google "troubleshoot dhcp with wireshark"
https://www.lovemytool.com/blog/2013/09/troubleshooting-dhcp-with-wireshark-by-tony-fortunato.html

i still learning how to trace with wireshark and still stuck because in the morning i must go to work :D :D i hope i can trace the problem

diazadip · 2019-01-02T15:31:58Z

Since other devices connect with no problem and only your Xiaomi phone has problem to connect, it seems we are debugging your phone and not arduino-esp32 or your sketch.

Make sure there is nothing setup or running on your phone that could possibly interfere with DHCP (no tethering of any kind like wifi hotspot or bluetooth tethering, no VPN setup or VPN app active, no network security apps etc). Also make sure that "DHCP / obtain IP automatically" or whatever the option is called in Xiaomi's MIUI is enabled for your ESP32 SSID.

Also consider restoring factory defaults on your phone and retrying... (make sure you backup your phone first)

Yes, i think i wanna try to restore factory setting my phone, who make me confuse is why my phone cannot connect only when ESP32 in AP STA Mode, but when ESP32 only AP Mode, my phone can connect to ESP32 :D :D. Today i've buy new ESP32, and got same problem.

I think the problem is in my phone, maybe wifi hardware or something not compatible with ESP32.

me-no-dev · 2019-01-02T15:43:51Z

you have taken a screenshot of the wireshark window :) and you can actualy take a .pcap file out of it and post that file here so we can look deeply into the packets. That screenshot up there shows little to no info

diazadip · 2019-01-02T21:41:08Z

you have taken a screenshot of the wireshark window :) and you can actualy take a .pcap file out of it and post that file here so we can look deeply into the packets. That screenshot up there shows little to no info

Hi, i'll try to do that, and i'll upload the result :)

diazadip · 2019-01-03T22:07:21Z

Hi, this is my log from .pcap file
Can Connect ESP32 (Only AP Mode).txt
Cannot Connect ESP32 (AP STA Mode).txt

I think because the problem is in my phone, so i'm using app tPacketCapture in my phone and trying to get data packet when i'm connected and cannot connected to my ESP32. I'm open that .pcap file in wireshark but i still dont understand to trace, i still must studying about that :D :D

me21 · 2019-01-14T08:22:04Z

Does your phone connect to ESP32 if you set "AP only" mode?

diazadip · 2019-01-14T11:32:14Z

Does your phone connect to ESP32 if you set "AP only" mode?

Yes, my phone can connect to ESP32 if ESP32 AP Only. even if my ESP32 is set to AP_STA Mode, if that ESP32 not connect to any wifi (just as AP Only), my phone still can connect to ESP32.

i'm still try to find someting configuration in my phone :D

me-no-dev · 2019-01-14T11:42:50Z

@diazaki this is not a pcap file :)
Here is how to specify it:

diazadip · 2019-01-14T22:29:17Z

@diazaki this is not a pcap file :)
Here is how to specify it:

sorry, i can't upload pcap file here :( so i copied to .txt file :)
if you want to open my .pcap file, may be i can't give via email :)

copercini · 2019-01-14T22:34:56Z

you can just zip it and drop here on github ;)

diazadip · 2019-01-14T22:43:10Z

Oh, yes, this is my pcap file, i have 4 file, 2 file when i can connect, and 2 file when i cannot connect :)

ESP32 pcap.zip

me-no-dev · 2019-01-23T05:03:04Z

funny enough I do not see any DHCP messages on either log... how did you connect and obtain IP?

davidbuzz · 2019-01-24T03:31:59Z

"an esptool.py erase_flash and load the firmware again" - fixed my problem, which was my perfectly good password being refused by my esp32 in AP mode.

diazadip · 2019-01-24T12:00:16Z

funny enough I do not see any DHCP messages on either log... how did you connect and obtain IP?

i just connect to ESP32 AP like connect to other wifi :)

"an esptool.py erase_flash and load the firmware again" - fixed my problem, which was my perfectly good password being refused by my esp32 in AP mode.

i've try this step with 2 ESP32 board and my xiaomi phone still can't connect :(

today i've got other mobile phone and i'll try to connect with my ESP32 :D

diazadip · 2019-01-28T22:31:59Z

Hi, i've try with my lenovo s890 phone, and that's phone is not get any problem to connect my ESP32. Maybe the problem is actually in my xiaomi's phone

akshar001 · 2019-01-30T16:33:28Z

@diazaki there is no problem it's with library i am trying it also and having same problem

diazadip · 2019-01-31T11:28:34Z

@diazaki there is no problem it's with library i am trying it also and having same problem

Owh, really? what the type your phone?

akshar001 · 2019-02-02T11:42:55Z

I am trying to connect even laptop from it but it doesn't, there is a simple question to ask if your phone has a problem or not. If your phone has a problem then it can not connect to any other wifi. If your phone is connecting to other router also then it has no problem esp32 has only problem.

pmezavergara · 2019-04-20T21:08:35Z

Hola, puedes subir el código completo, estoy e lo mismo, gracias

sonastyle · 2019-05-07T07:58:23Z

Use ESP32-Arduino Core build 1.0.2. I faced the same issue on build 1.0.1.

GeorgeFlorian · 2019-07-09T11:31:17Z

Any luck with this ?
I am experiencing the same issue !
#2910

FrenchLab47 · 2019-07-11T07:42:56Z

Hello all,
I come to share my experience:
I just noticed a problem connecting my phone on my ESP32 in AP mode. It marks "Wifi connected to the ESP32 access point", but the browser can not display the pages on the correct IP address (I use ESPAsyncWebServer, but it does not seem to be a server problem).
I do not have a problem with a tablet, or another phone without a SIM card. I tested different settings, and I noticed that my problem only occurred on the phone with SIM card when it is connected to Internet (mobile data). I disconnect the mobile data and everything works again. This is not really annoying if it is specified to the users, but I do not have the explanation to this blocking.

Regarding the connection with a computer, I have problems when I use the original IP address of the ESP32 (192.168.4.1) because it is the same address as the management page of my Internet box. This address is used by many Internet boxes. To avoid this connection problem, I gave another IP address to my ESP32 (like 1.2.3.4 or whatever) and it works.

When connection problems are all fixed, there may still be slowness problems with the display of pages. I improved this by indicating the size of the files before sending them:
response-> addHeader ("Content-Length", (String) file.size ());

If that can help you...

GeorgeFlorian · 2019-07-15T08:24:35Z

Hello all,
I come to share my experience:
I just noticed a problem connecting my phone on my ESP32 in AP mode. It marks "Wifi connected to the ESP32 access point", but the browser can not display the pages on the correct IP address (I use ESPAsyncWebServer, but it does not seem to be a server problem).
I do not have a problem with a tablet, or another phone without a SIM card. I tested different settings, and I noticed that my problem only occurred on the phone with SIM card when it is connected to Internet (mobile data). I disconnect the mobile data and everything works again. This is not really annoying if it is specified to the users, but I do not have the explanation to this blocking.

Regarding the connection with a computer, I have problems when I use the original IP address of the ESP32 (192.168.4.1) because it is the same address as the management page of my Internet box. This address is used by many Internet boxes. To avoid this connection problem, I gave another IP address to my ESP32 (like 1.2.3.4 or whatever) and it works.

When connection problems are all fixed, there may still be slowness problems with the display of pages. I improved this by indicating the size of the files before sending them:
response-> addHeader ("Content-Length", (String) file.size ());

If that can help you...

Reading through this repository I found that there are some users that have problems connecting to the ESP32's AP Mode. And there isn't a fix yet for it.

#2910

I don't know how to add a header because I haven't done this before. How should that work with the following handler :

  server.on("/register", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send(SPIFFS, "/indexAP.html", "text/html", false, processor);
  });

Like this maybe ?

  server.on("/register", HTTP_GET, [](AsyncWebServerRequest *request){
    AsyncWebServerResponse *response = request->beginResponse(SPIFFS, "/indexAP.html", "text/html", false, processor);
    File file = SPIFFS.open("/indexAP.hmtl");
    response->addHeader("Content-Length", (String) file.size ());
    request->send(response);
    file.close();
  });

stale · 2019-09-19T23:27:16Z

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.

stale · 2019-10-04T00:21:59Z

[STALE_DEL] This stale issue has been automatically closed. Thank you for your contributions.

stale bot added the Status: Stale Issue is stale stage (outdated/stuck) label Sep 19, 2019

stale bot closed this as completed Oct 4, 2019

Client cannot connect ESP32 AP in AP-STA Mode #2242

Client cannot connect ESP32 AP in AP-STA Mode #2242

Comments

diazadip commented Dec 25, 2018

Hardware:

Description:

Sketch: I'm cut my sketch because it's too long :)

Debug Messages:

lbernstone commented Dec 25, 2018

diazadip commented Dec 25, 2018

lbernstone commented Dec 25, 2018 • edited Loading

diazadip commented Dec 25, 2018

lbernstone commented Dec 25, 2018

diazadip commented Dec 25, 2018

lbernstone commented Dec 25, 2018 • edited Loading

diazadip commented Dec 25, 2018

me-no-dev commented Dec 26, 2018

copercini commented Dec 26, 2018

diazadip commented Dec 26, 2018

diazadip commented Dec 26, 2018

diazadip commented Dec 26, 2018

diazadip commented Dec 27, 2018

lbernstone commented Dec 27, 2018

mouridis commented Jan 2, 2019

diazadip commented Jan 2, 2019

diazadip commented Jan 2, 2019

me-no-dev commented Jan 2, 2019

diazadip commented Jan 2, 2019

diazadip commented Jan 3, 2019

me21 commented Jan 14, 2019

diazadip commented Jan 14, 2019

me-no-dev commented Jan 14, 2019

diazadip commented Jan 14, 2019

copercini commented Jan 14, 2019

diazadip commented Jan 14, 2019

me-no-dev commented Jan 23, 2019

davidbuzz commented Jan 24, 2019

diazadip commented Jan 24, 2019 • edited Loading

diazadip commented Jan 28, 2019

akshar001 commented Jan 30, 2019

diazadip commented Jan 31, 2019

akshar001 commented Feb 2, 2019

pmezavergara commented Apr 20, 2019

sonastyle commented May 7, 2019

GeorgeFlorian commented Jul 9, 2019

FrenchLab47 commented Jul 11, 2019

GeorgeFlorian commented Jul 15, 2019 • edited Loading

stale bot commented Sep 19, 2019

stale bot commented Oct 4, 2019

lbernstone commented Dec 25, 2018 •

edited

Loading

lbernstone commented Dec 25, 2018 •

edited

Loading

diazadip commented Jan 24, 2019 •

edited

Loading

GeorgeFlorian commented Jul 15, 2019 •

edited

Loading