[ESP32] SimpleWifi Reconnect

[cujomalainey]

Blynk library version: 0.6.1 IDE: Neovim IDE version: N/A Board type: Adafruit Feather HUZZAH32 Additional modules: External LEDs

Scenario, steps to reproduce

Start a device, let it connect to wifi, disconnect wifi (e.g. disconnect router or turn off hotspot) then plug back in an resume wifi

Expected Result

Device would resume wifi when it becomes available

Actual Result

Device is stuck forever re-attempting to connect to the server

[21543] Connecting to blynk-cloud.com:80
[E][WiFiClient.cpp:220] connect(): lwip_connect_r: 118
[26544] Connecting to blynk-cloud.com:80
[E][WiFiClient.cpp:220] connect(): lwip_connect_r: 118

Side notes

From what I can tell. It appears the ESP32 needs an explicit disconnect when a WiFi connection fails. I was digging around but I can't tell if it is getting that call from within the framework.

[cujomalainey]

For those also experiencing this issue, I found a work around

bool connected = false;
void setup() {}

void loop()
{
  if(!Blynk.connected() && connected) {
    Blynk.disconnect();
    delay(500);
    connected = false;
    Blynk.begin(auth, ssid, pass);
  } else {
    connected = true;
  }
  Blynk.run();
}

[pradgood]

Hi I tried it but no success Find a way to repower the board.

[cujomalainey]

@pradgood there is a fix upstream in the ESP32 library for this wifi issue, should roll out in the next while https://github.com/espressif/arduino-esp32/issues/2769#issuecomment-491580150

[vshymanskyy]

I think this was mainly related to instability of ESP32 Arduino core. Feel free to reopen the issue if it still happens

[nodoubtman]

An easy workaround i found on youtube :)

Blynk.begin(BLYNK_AUTH, ssid, password, "blynk-cloud.com", 8080);

that's all :) Have a good day. Marc.