ESP8266 Community Forum

Posted: **Wed Aug 17, 2016 4:20 pm**

Hi,

I have some ESP-01 modules which use the following code to connect to local the router in 1800 to 1900ms after initial boot and deep sleep, respectively:

Code: Select all

  unsigned long ts = millis();
  if (WiFi.status() == WL_CONNECTED) {
    return true;
  }

      IPAddress ip(192,168,0,50+devID);
      IPAddress gateway(192,168,0,1);
      IPAddress subnet(255,255,255,0);
      WiFi.config(ip, gateway, subnet);
      uint8_t bssid[6] = {12,32,123,87,187,56};
      WiFi.begin(ssid.c_str(), password.c_str(), 4, bssid);

    int imax = WLAN_TRIES;
    int x=0;
    
    delay(500); // Wait for connection
    while (WiFi.status() != WL_CONNECTED) {
      delay(100+x*20); x++;
      imax--;
      if (imax == 0) {
        return false;
      }
    }   
  unsigned long tr = millis()- ts;
  iTime2Connect = (int)(tr / 1000L);

Note that the following line reduced the time to connect from 4100ms to 1900ms!

Code: Select all

uint8_t bssid[6] = {12,32,123,87,187,56};
      WiFi.begin(ssid.c_str(), password.c_str(), 4, bssid);

I've searched the forum and the web repeatedly. Any further suggestions to reduce connection time? I read somewhere that some have modules that connect in less than 500ms

Would be nice to reduce the time spending 80mA (when using WiFi) further to improve battery life.

Thanks & best!

Posted: **Tue Aug 23, 2016 2:52 am**

Did you do any other optimization? I tried your code, and in my setup the time to connect is around 4 seconds, which is still a bit high.

Posted: **Tue Aug 23, 2016 6:17 am**

depends a lot on type of authentication, encryption and router.

WEP, WPA and WPA2 have increasing level of complexity as do tkip and aes nave increasing demands on cpu power.

it should be clear that in the example above
uint8_t bssid[6] = {12,32,123,87,187,56};
should be replaced with the MAC representation of your AP.

Posted: **Tue Aug 23, 2016 12:22 pm**

Hi erbedo,

I think you had the wrong MAC address because that did the trick for me, see schufti's note.
To clarify my setting a bit. The (old) router uses a fixed channel, SSID broadcasting is active, 802.11b/g, WPA-PSK/WPA2-PSK with AES/TKIP.
The distance between router and ESPs vary from 3 to 9 meters (through 1 to 3 walls).

Best!

ESP8266 Community Forum

ESP-01: 1900ms to connect to WiFi - further improvements?

ESP-01: 1900ms to connect to WiFi - further improvements?

Re: ESP-01: 1900ms to connect to WiFi - further improvements

Re: ESP-01: 1900ms to connect to WiFi - further improvements

Re: ESP-01: 1900ms to connect to WiFi - further improvements