2.4.0 incorrectly reports WL_CONNECTED immediately after WiFi.mode(WIFI_STA), without waiting for WiFi.begin() or a successful connection. #4166
Description
Hardware: D1-mini
Core Version: Arduino-IDE(v1.8.5) with ESP8266-board-software-version 2.4.0
[IwIP Variant: v2 Prebuilt (both MSS=536 and MSS=1460)]
Problem description
After successfully connecting using "WiFi.mode(WIFI_STA)". If you then disconnect using "WiFi.disconnect()" & "WiFi.mode(WIFI_OFF)", and finally try to reconnect again starting with "WiFi.mode(WIFI_STA)", then "WiFi.status()" reports "WL_CONNECTED" immediately after the "WiFi.mode(WIFI_STA)" (ie. long before it has connected). It then continues to say "WL_CONNECTED" up until you issue the "WiFi.begin(ssid, password)" command (at which point it starts to correctly say "WL_DISCONNECTED" again).
This means it is not possible to reliably use "while (WiFi.status()!=WL_CONNECTED)" to check for or initiate a "WiFi.begin" command or similar.
(Note that v2.3.0 and v2.4.0-rc2 seemed to correctly report "WL_DISCONNECTED" or "WL_IDLE_STATUS" right up until the connection was successfully re-established.)
(This seems to be different to the issue reported in #4161.)
Example Sketch
#include <ESP8266WiFi.h>
const char* ssid = "your_ssid";
const char* password = "your_password";
void setup() {
Serial.begin(74880); delay(3000);
Serial.print("About to start:"); display_status();
WiFi.mode(WIFI_STA);
Serial.print("WiFi.mode(WIFI_STA):"); display_status(); // correct here gives: "WiFi.status()=WL_DISCONNECTED"
WiFi.begin(ssid, password);
Serial.print("WiFi.begin:"); display_status();
wait_connection();
Serial.print("WiFi connected: "); display_status();
Serial.println("--------------------");delay(5000);
WiFi.disconnect(); delay(5);
Serial.print("WiFi.disconnect: "); display_status();
WiFi.mode(WIFI_OFF); delay(5);
Serial.print("WiFi.mode(WIFI_OFF): "); display_status();
WiFi.forceSleepBegin(); delay(1);
Serial.print("WiFi.forceSleepBegin: "); display_status();
Serial.println("--------------------");delay(5000);
WiFi.forceSleepWake(); delay(1);
Serial.print("WiFi.forceSleepWake: "); display_status();
WiFi.mode(WIFI_STA); delay(5);
Serial.print("WiFi.mode(WIFI_STA):"); display_status(); // error here gives: "WiFi.status()=WL_CONNECTED"
Serial.println("NB. I beleive the above should NOT return 'WL_CONNECTED'");
Serial.println("(when used with D1-Mini and Arduino-IDE-with-ESP8266-board-sw-v2.4.0)");
Serial.println("--------------------");delay(5000);
Serial.print("After Delay:"); display_status();
WiFi.begin(ssid, password);
Serial.print("WiFi.begin:"); display_status();
wait_connection();
Serial.print("WiFi connected: "); display_status();
Serial.println("--------END---------");
}
void loop() {}
void wait_connection() {while (WiFi.status()!=WL_CONNECTED) {Serial.print(".");delay(500);}}
void display_status() {
byte x=WiFi.status(); Serial.print(" WiFi.status()=");
if (x==WL_CONNECTED) Serial.println("WL_CONNECTED");
else if (x==WL_DISCONNECTED) Serial.println("WL_DISCONNECTED");
else if (x==WL_CONNECT_FAILED) Serial.println("WL_CONNECT_FAILED");
else if (x==WL_NO_SSID_AVAIL) Serial.println("WL_NO_SSID_AVAIL");
else if (x==WL_IDLE_STATUS) Serial.println("WL_IDLE_STATUS");
else Serial.println(x);
}