Bug? ESP8266 wifi.connect2 hangs

[JanG]

Another problem:
I use Wemos D1. For connecting to WIFI I use the funtion wifi.connect2. But sometimes this function hangs forever. A reset by the button doesn't help. Only a power off/on helps. I checked this behaviour with two diffent Wemos (D1 mini pro and D1 R2).

Maybe this is the same issue:
https://www.b4x.com/android/forum/posts/457328/

And the obove mentioned problem seems to go with this:
https://www.b4x.com/android/forum/threads/memory-leak-in-wifisocket-connecthost.74286/

With the line CallSubPlus("CloseConnection", 200, 0) I don't have this issue, but then I have the other issue. Strange! I can decide between problem A and problem B, but I don't need anything of it...

 

[Erel]

WiFi.Connect / Connect2 are blocking methods. Internally they wait for the connection result and only then they return. If there is no result for some reason then they will not return.

Can you post your code?

 

[JanG]

After searching the net I think I found the solution. You have to edit the function Connect2 in rESP8266WiFi.cpp like that:

    bool B4RESPWiFi::Connect2(B4RString* SSID, B4RString* Password) {
        WiFi.persistent(false);
        WiFi.mode(WIFI_STA);
        if (WiFi.status() != WL_CONNECTED){
            WiFi.begin(SSID->data, Password != NULL ? Password->data : NULL);
            while (WiFi.status() != WL_CONNECTED){
                delay(500);
            }
        }
        return WiFi.waitForConnectResult() == WL_CONNECTED;
    }

I think that's the solution. Until now I don't have this long waiting problems and I hope it will remain like that .
BTW: I deleted a debug line in your code: "available" in checkForClient.

 

[Erel]

Does it hang if you use the original code and call persistent and mode with inline C: https://www.b4x.com/android/forum/threads/esp8266-wifi-and-socket.69164/#post-438940 ?

 

[JanG]

Yes, it hangs anyway, because the two lines

WiFi.persistent(false);
WiFi.mode(WIFI_STA);

do not solve the problem alone. It's the while-waiting:

while (WiFi.status() != WL_CONNECTED){
    delay(500);
}

This code can only be integrated if you edit the rESP8266WiFi.cpp.

 

[Erel]

I will add this code to the library.