Scan networks don't work after WPS config failed

[QuentinC]

Basic Infos

Hardware

Hardware: Sparkfun Thing (with 4Mbyte flash)
Core Version: Arduino 2.1.0

Description

I'm trying to make an automatic Wifi management.
When I want to scan for networks, I have a FAILED error (-2) if it's done after a failed WPS config.

Below if the sample sketch for Wifi scan, with a WPS attempt at the end.
Scan only works once here, where it should always return some networks.

Settings in IDE

Module: Generic ESP8266 Module
Flash Size: 4MB
CPU Frequency: 80Mhz
Flash Mode: dio
Flash Frequency: 40Mhz
Upload Using: OTA / SERIAL (same problem for both)
Reset Method: ck

Sketch

#include "ESP8266WiFi.h"

void setup() {
  Serial.begin(115200);

  // Set WiFi to station mode and disconnect from an AP if it was previously connected
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);

  Serial.println("Setup done");
}

void loop() {
  Serial.println("scan start");

  // WiFi.scanNetworks will return the number of networks found
  int n = WiFi.scanNetworks();
  Serial.println("scan done");
  if (n == 0)
    Serial.println("no networks found");
  else
  {
    Serial.print(n);
    Serial.println(" networks found");
    for (int i = 0; i < n; ++i)
    {
      // Print SSID and RSSI for each network found
      Serial.print(i + 1);
      Serial.print(": ");
      Serial.print(WiFi.SSID(i));
      Serial.print(" (");
      Serial.print(WiFi.RSSI(i));
      Serial.print(")");
      Serial.println((WiFi.encryptionType(i) == ENC_TYPE_NONE)?" ":"*");
      delay(10);
    }
  }
  Serial.println("");

  // Wait a bit before scanning again
  delay(5000);
  WiFi.beginWPSConfig();
  delay(5000);
}

Serial output

Setup done                              
scan start                                                           
scan done                                           
5 networks found                          
1: ***** (-92)                   
2: ***** (-90)*                     
3: ***** (-80)*                                
4: ***** (-78)*                               
5: ***** (-79)*

scan start                                           
scan done                                           
-2 networks found

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[jbheren]

Same issue here, plus doing a WiFi.begin(ssid, password); after WPS failure will not work either.

[jbheren]

OK, there must be a missing wifi_wps_disable(); somewhere, it works for me when I Add it manually to the sketch. Issue is that beginWPSConfig thinks it succeded but it did not actually.

#include "ESP8266WiFi.h"

extern "C" {
  #include "user_interface.h"
}
...
void setup() {
  Serial.begin(74880);
  Serial.setDebugOutput(1);
  Serial.setDebugOutput(true);
  delay(10);

  // If not connected, run the WPS procedure.
  if(!connectWPS()) {
    Serial.println("WPS Failed");
    **wifi_wps_disable();**
  }
  // if all failed, connect to failback
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("Attempting connection to failback... ");
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
    }
  }
}

// https://gist.github.com/copa2/fcc718c6549721c210d614a325271389
bool connectWPS() {
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("\nAttempting WPS connection ...");
    bool wpsSuccess = WiFi.beginWPSConfig();
    if(wpsSuccess) {
      // Ckeck SSID
      String newSSID = WiFi.SSID();
      if(newSSID.length() > 0) {
        // WPSConfig has already connected in STA mode successfully to the new station.
        Serial.printf("WPS finished. Connected successfull to SSID '%s'\n", newSSID.c_str());
      } else {
        Serial.println("WiFi.beginWPSConfig() returns true BUT WiFi.SSID() is Empty");
        wpsSuccess = false;
      }
    }
    return wpsSuccess; 
  } 
}

see the log

Attempting WPS connection ...
wifi_wps_enable
wps scan
build public key start
build public key finish
f r0, scandone
f r0, scandone
f r0, scandone
f r0, scandone
f r0, scandone
wps cb status: 4
WiFi.beginWPSConfig() returns true BUT WiFi.SSID() is Empty
WPS Failed
wifi_wps_disable
Attempting connection to failback...
f r0, ....scandone
state: 0 -> 2 (b0)
.state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 3
cnt

connected with foobar, channel 1
dhcp client start...
chg_B1:-40
..chg_B1:-80
.ip:192.168.1.157,mask:255.255.255.0,gw:192.168.1.1
.Setup done
18:FE:34:A6:01:38
force slp enable,type: 1
Connected to foobar