ESP8266 Exception (3)

I swore I had the NodeMCU running on WiFi before, but after uploading new code (not new ESP8266 firmware either) that accesses the wifi library, I got crazy output on serial monitor.  Basically it was an exception and a stack dump (I needed Imodium for my NodeMCU!!) that repeated after any call to the wifi code in library.

Exception (3):
epc1=0x401003e9 epc2=0x00000000 epc3=0x00000000 excvaddr=0x400072f1 depc=0x00000000

I originally had the 2.2 version of ESP8266 source and library and removed it and got latest build at 2.3 for Arduino.  This all done through the ‘Board Manager’ built-in to Arduino IDE.  I also tried adding WiFi.disconnect(true); before calling any wifi code.  The stack dump continued and I got nowhere.  I tried changing boards and tried all ESP8266 varieties to no avail.  Then I did a search on all exceptions and found that a workaround for a (2) exception was to add WiFi.persistent(false).  I’ll be a monkey’s uncle!  That did it.  So, WiFi.disconnect(true) by itself did not solve the problem….persistent(false) did.

Serial.println();
Serial.println();
Serial.println(“——————————–“);
Serial.print(“Connecting to “);
Serial.println(ssid);
Serial.println(“Attempt Login…..”);
WiFi.persistent(false);
WiFi.disconnect(true);
WiFi.begin(ssid, password);

That code above did the trick.

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