ESP8266 Can't connect to WIFI network and can't work as access point

[mohamedsemz]

Problem Description

I used the WiFiAccessPoint example and I couldn't find the network using both laptop and mobile phone.

I tried to run the WiFiScan example to check if the hardware is working or not. The ESP couldn't find my wifi, phone hotspot. But it only finds mobile hotspot created from laptop. I checked the router and confirmed that the router is working on 2.4 GHz not 5 GHz.

I tried the HelloServer example with my wifi network name (which is couldn't be found in the Scan example) and the status is WL_DISCONNECTED for sometime and then WL_NO_SSID_AVAIL.

I tried the HelloServer example with hotspot created from the laptop (which is found in the Scan example) and the status is WL_DISCONNECTED for sometime and then WL_CONNECT_FAILED.

What is the issue and how to fix it ? Or how o debug this kind of issues ?

Note:
I'm using Core version 3.0.2, Nodemcu with ESP8266 and Arduino IDE.
I also tested 3.0.0, 2.7.2, 2.4.2 and all of them not working too.

[mohamedsemz]

I enabled the debugging and when running the AP example I get
20:10:38.091 -> Configuring access point...fpm close 3
20:10:38.091 -> mode : softAP(32:83:98:a5:34:f3)
20:10:38.091 -> add if1
20:10:38.091 -> dhcp server start:(ip:192.168.4.1,mask:255.255.255.0,gw:192.168.4.1)
20:10:38.091 -> bcn 100
20:10:38.982 -> bcn 0
20:10:38.982 -> del if1
20:10:38.982 -> usl
20:10:38.982 -> add if1
20:10:38.982 -> dhcp server start:(ip:192.168.4.1,mask:255.255.255.0,gw:192.168.4.1)
20:10:38.982 -> bcn 100
20:10:38.982 -> Awifi evt: 8
20:10:38.982 -> P IP address: 192.168.4.1
20:10:38.982 -> HTTP server started

and in HelloServer
20:19:07.653 -> scandone
20:19:08.544 -> state: 0 -> 2 (b0)
20:19:08.544 -> state: 2 -> 3 (0)
20:19:08.544 -> state: 3 -> 5 (10)
20:19:08.544 -> add 0
20:19:08.544 -> aid 1
20:19:08.544 -> cnt
20:19:18.541 -> pm open,type:2 0
20:19:18.541 -> state: 5 -> 0 (2)
20:19:18.541 -> rm 0
20:19:18.541 -> pm close 7
20:19:18.541 -> reconnect
20:19:18.541 -> wifi evt: 1
20:19:18.587 -> STA disconnect: 204
20:19:18.667 -> scandone
20:19:18.667 -> state: 0 -> 2 (b0)
20:19:18.667 -> state: 2 -> 3 (0)
20:19:18.716 -> state: 3 -> 5 (10)
20:19:18.716 -> add 0
20:19:18.716 -> aid 1
20:19:18.716 -> cnt
20:19:28.683 -> pm open,type:2 0
20:19:28.683 -> state: 5 -> 0 (2)
20:19:28.683 -> rm 0
20:19:28.683 -> pm close 7
20:19:28.683 -> reconnect
20:19:28.683 -> wifi evt: 1
20:19:28.683 -> STA disconnect: 204
20:19:28.824 -> scandone
20:19:28.824 -> state: 0 -> 2 (b0)
20:19:28.824 -> state: 2 -> 3 (0)
20:19:28.824 -> state: 3 -> 5 (10)
20:19:28.824 -> add 0
20:19:28.824 -> aid 1
20:19:28.824 -> cnt
20:19:38.860 -> pm open,type:2 0
20:19:38.860 -> state: 5 -> 0 (2)
20:19:38.860 -> rm 0
20:19:38.860 -> pm close 7
20:19:38.860 -> reconnect
20:19:38.860 -> wifi evt: 1
20:19:38.860 -> STA disconnect: 204
20:19:38.953 -> scandone
20:19:38.953 -> state: 0 -> 2 (b0)
20:19:39.938 -> state: 2 -> 0 (2)
20:19:39.938 -> reconnect
20:19:39.938 -> wifi evt: 1
20:19:39.984 -> STA disconnect: 2
20:19:40.078 -> scandone
20:19:40.078 -> state: 0 -> 2 (b0)
20:19:40.078 -> state: 2 -> 3 (0)
20:19:40.078 -> state: 3 -> 5 (10)
20:19:40.078 -> add 0
20:19:40.078 -> aid 1
20:19:40.078 -> cnt

[lorerave85]

I have a very similar problem:

the same code that I use regularly for other esp8266 (and that work) has stopped working and now going to debug it no longer sees any wifi network.

i installed arduino IDE 1.8.19 on my new mac with M1 processor, and it doesn't seem to work anymore.

core version 3.0.2 which has been standing still for almost a year.

[d-a-v]

Did you try the option "erase flash > all flash content" ?

[mohamedsemz]

I still have the same issue and didn't fix it yet.

Did you try the option "erase flash > all flash content" ?

I tried it back then and had the same issue.

[lorerave85]

I tested all core versions from 2.4 up to 3.0.2.
every time I erased everything.
today I try with an external power supply, maybe the USBC-USB-ESP8266 adapter can't power it

[mohamedsemz]

I tested all core versions from 2.4 up to 3.0.2. every time I erased everything. today I try with an external power supply, maybe the USBC-USB-ESP8266 adapter can't power it

It's good idea. I didn't try external power supply. Let us know the result.

[lorerave85]

no change, same error: no SSID found

[voblaunsane]

same problem, running this basic code does not set a SSID nor does it set a password. what's going on?
erasing all contents; usually powering from PC usb, but also tried 2A wall chargers with same results..

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>

ESP8266WebServer server(80);

void handleRoot() {
  server.send(200, "text/html", "<h1>You are connected</h1>");
}

void setup() {
  delay(1000);
  Serial.setDebugOutput(true);
  Serial.begin(115200);
  
  WiFi.softAP("ESPap", "thereisnospoon");

  server.on("/", handleRoot);
  server.begin();

  WiFi.printDiag(Serial);
}

void loop() {
  server.handleClient();
}

SDK:2.2.2-dev(38a443e)/Core:3.0.2=30002000/lwIP:STABLE-2_1_2_RELEASE/glue:1.2-48-g7421258/BearSSL:6105635
fpm close 3 
mode : softAP(26:a1:60:3a:b7:98)
add if1
dhcp server start:(ip:192.168.4.1,mask:255.255.255.0,gw:192.168.4.1)
bcn 100
bcn 0
del if1
usl
add if1
dhcp server start:(ip:192.168.4.1,mask:255.255.255.0,gw:192.168.4.1)
bcn 100
Mwifi evt: 8
ode: AP
PHY mode: N
Channel: 1
AP id: 0
Status: 255
Auto connect: 1
SSID (0): 
Passphrase (0): 
BSSID set: 0

config: https://i.postimg.cc/GhcP23ZJ/Untitled.jpg

[lorerave85]

I made an even simpler test with the example of the CORE 3.0.2 library - ESP8266WiFi.h
WifiScan.ino

result:
wemos d1 mini (on the right): everything ok
wemos d1 mini v3 (on the left): cannot find any networks

I begin to think that it is version 3 of the wemos that has something wrong, there must be some incompatibility.
All wemos old versions work

[voblaunsane]

I've got this one:

It came with the manual where it says to choose "Generic ESP8266 Module" board option. It used to work very well a few years back, but I couldn't make it work yesterday... Thanks to pictures @lorerave85 posted, I noticed "D1 mini" written on the corner of my board, so I picked "LOLIN(WEMOS) D1 mini (clone)" and this solved my problem. The code is working now. Thank you!

It turns out RTFM, but don't fcuking trust it. lol