CORRUPT HEAP after opening the Websocket example

[jerre321]

When I open the Websocket example following error is shown in the Serial monitor and the ESP32 reboots:

CORRUPT HEAP: Bad tail at 0x3ffd94a8. Expected 0xbaad5678 got 0xbaad5600
assert` failed: multi_heap_free multi_heap_poisoning.c:259 (head != NULL)

I'm using an ESP32-WROOM-32 board and in platformio.ini I configured node32s.

The issue seems to be related to the "_webSocket.makeBuffer" function.

I have replace following code in WebSocketTxRx.h:

    size_t len = measureJson(jsonDocument);
    AsyncWebSocketMessageBuffer* buffer = WebSocketConnector<T>::_webSocket.makeBuffer(len);
    if (buffer) {
      serializeJson(jsonDocument, (char*)buffer->get(), len + 1);
      if (client) {
       client->text(buffer);
      } else {..........

with:

    String payloadStr;
    serializeJson(jsonDocument, payloadStr);
    if (client) {
      client->text(payloadStr); 
    } else {..........

Which fixes the crash and the example seems to work.

But I'm not an expert in this and want to understand what the real issue is and what the impact is of this change.
Because it looks like I'm the only one that is facing this issue.

[tichaonax]

This is actually good find, your fix works for ESP32 but I had to replace the two occurrences in the same header file. I am still to test if this does not affect the ESP8266 which worked before your fix. I am updated my branch and I am all good, thanks again.