Connection to static IP fails

[bbkiwi]

Description

In the attached sketch, having a small delay at the beginning of setup() seems to cause connection to a static IP to fail.

The code below produces the error: it fails to connect. I expected it connect quickly using static IP, but it usually fails to connect at all or takes a very long time. If I try a new static IP, sometimes it seems to connect once, but after resetting or even recompiling and loading fails from then on.

In the example, If either the delay(500); or WiFi.config(staticIP, gateway, subnet); is commented out
the problem goes away. Connection to the static IP is very fast or connection to the assigned IP as usual. Upon reset or power on, connects each time.

(I looked at issue #128 but the problem is there with either order of config and begin)
Of course the solution is not to put a delay, but it is a puzzle why this happens :-)

Settings in IDE

Module: NodeMCUv1.0 (ESP 12E module)
Flash Size: 4M(3M spiff)
CPU Frequency: 80Mhz
Upload Using: SERIAL 256000

// Bug with connecting with static IP
// Fails (except perhaps on first use of specified IP) to connects
//       (rarely will connect after very long time 30 secs)
// Removing delay fixes and connection to specified IP is very fast (1 dot)
// If comment out WiFi.config works fine (the delay has not effect), however
// Connection time is longer as connects via DHCP
// Tested on nodemcu v1.0 IDE 1.8.1 ESP8266 2.3.0

#include <ESP8266WiFi.h>

const char* ssid = "Test Station";
const char* password = "testpassword";
IPAddress staticIP(192,168,1,229);
IPAddress gateway(192,168,1,1);
IPAddress subnet(255,255,255,0);

void setup() {
 Serial.begin(115200);
 //BUG? with delay below, fails to connect to specified IP (except perhaps on first use)
 delay(500); //problem happens with delays of 150 or more
 WiFi.config(staticIP, gateway, subnet);
 WiFi.begin(ssid, password);

 Serial.println();
 Serial.print("Connecting");
 while(WiFi.status() != WL_CONNECTED)
 {
   Serial.print(".");
   delay(500);
 }
 Serial.println();
 Serial.print("WiFi Connected, IP:");
 Serial.println(WiFi.localIP());
}

void loop() {
}

[hazza-ob]

Have you tried testing this with other micro controllers? May be due to the timers within the chip...

Although this is just theorising

[N0ury]

@bbkiwi I have similar problem.
I didn't see that running WiFi.config at the very beginning of setup would work.
As for you, it works fine with dhcp.
Connection is also very fast. I have no dot at all after first run.
I'm using same conf with ESP-12F board. Tried also 1M spiff.
Did you solve the issue ? If so, how ?
Thanks

[bbkiwi]

I have not solved it. I have been programming using nonos directly and just wanted to see if the similar problem occurred using Arduino ide (which it did hence me raising the issue). Once it starts refusing to connect, if I reset my router, it will connect again to specified IP.

[lrmoreno007]

Try this:

 // Bug with connecting with static IP
 // Fails (except perhaps on first use of specified IP) to connects
 //       (rarely will connect after very long time 30 secs)
 // Removing delay fixes and connection to specified IP is very fast (1 dot)
 // If comment out WiFi.config works fine (the delay has not effect), however
 // Connection time is longer as connects via DHCP
 // Tested on nodemcu v1.0 IDE 1.8.1 ESP8266 2.3.0
 
 #include <ESP8266WiFi.h>
 
 const char* ssid = "Test Station";
 const char* password = "testpassword";
 IPAddress staticIP(192,168,1,229);
 IPAddress gateway(192,168,1,1);
 IPAddress subnet(255,255,255,0);
 
 void setup() {
  Serial.begin(115200);
  //BUG? with delay below, fails to connect to specified IP (except perhaps on first use)
  //delay(500); //problem happens with delays of 150 or more
  WiFi.config(staticIP, gateway, subnet);
  delay(100);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
 
  Serial.println();
  Serial.print("Connecting");
  while(WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(500);
  }
  Serial.println();
  Serial.print("WiFi Connected, IP:");
  Serial.println(WiFi.localIP());
 }
 
 void loop() {
 }

Regards

[devyte]

@bbkiwi @lrmoreno007 is this still valid with latest git?

[lrmoreno007]

I don't have problems.

[hasenradball]

Hello,

please try to check the reset reason!
Like this:

 void setup() {
  
  if(ESP.getResetReason() != "Power on") {
     WiFi.mode(WIFI_OFF);
  }
  Serial.begin(115200);
  //BUG? with delay below, fails to connect to specified IP (except perhaps on first use)
  //delay(500); //problem happens with delays of 150 or more
  WiFi.config(staticIP, gateway, subnet);
  delay(100);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
 
  Serial.println();
  Serial.print("Connecting");
  while(WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(500);
  }
  Serial.println();
  Serial.print("WiFi Connected, IP:");
  Serial.println(WiFi.localIP());
 }
 
 void loop() {
 }

The the problem should never occur.

[hasenradball]

Hello I think I have understood the Problem, see description below:

1. The ESP has an autoreconnect function with does a reconnect with an previous established WLAN connection.
2. With inserting an delay(500) the autoreconnect function is able to etablish the connection wih previous settings.
3. Therefore the WiFi configuration after the delay() is redundant and not possible!
4. If you want that the WiFi Configuration works fine, you should set a WIFI_OFF before.

[PropsDataCom]

Hello I think I have understood the Problem, see description below:

1. The ESP has an autoreconnect function with does a reconnect with an previous established WLAN connection.
2. With inserting an delay(500) the autoreconnect function is able to etablish the connection wih previous settings.
3. Therefore the WiFi configuration after the delay() is redundant and not possible!
4. If you want that the WiFi Configuration works fine, you should set a WIFI_OFF before.

Your comment about turning off the wifi fixed my issues, thanks. this snippet is what makes all your static ip problems go away (at least for the ESP8266).

WiFi.mode(WIFI_OFF);
WiFi.config(IP, gateway, subnet); @ @

[hasenradball]

I prefer to set at the first line within the setup:

WiFi.setAutoConnect(false);

The you will also have no problems anymore

[N0ury]

Hi,

Which solution would be the best, power consuming talking:
1 - always turn off wifi
2 - turn off wifi only when we are not in "Power on" mode
3 - set AutoConnect to false

Thanks

[hasenradball]

When you know you nerd wifi then boot with wifi.
Else boot without wifi.

[d-a-v]

About power saving we now have preinit()

Arduino/libraries/ESP8266WiFi/examples/EarlyDisableWiFi/EarlyDisableWiFi.ino

Line 18 in 8a64a12

ESP8266WiFiClass::preinitWiFiOff();

BTW, any good battery-powered example is welcome.