Cannot send more than 4 characters from server -> client

khoih-prog / Portenta_H7_AsyncWebServer

Asynchronous WebServer Library for STM32H7-based Portenta_H7 using mbed_portenta core. This library, which is relied on Portenta_H7_AsyncTCP, is part of a series of advanced Async libraries, such as AsyncTCP, AsyncUDP, AsyncWebSockets, AsyncHTTPRequest, AsyncHTTPSRequest, etc. Now supporting using CString in optional SDRAM to save heap to send very large data

GNU Lesser General Public License v3.0

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I am unable to send a message to the client that is more than 4X characters long. I am able to reliably receive/decode on my my client (python+websockets), however, if the message from Portenta_H7_AsyncWebServer is longer than 4 characters, I get a ProtocolError: reserved bits must be 0 error which triggers a disconnect.

to reproduce:

void onEvent(AsyncWebSocket * server, AsyncWebSocketClient * client, AwsEventType type, void * arg, uint8_t *data, size_t len){
  if(type== WS_EVT_CONNECT){
    Serial.println("WS Connected!");
    client->text("Hey"); // works
  }
    else if(type == WS_EVT_DISCONNECT)
  {
    //client disconnected
    Serial.println("ws disconnect");
  }
  else if(type == WS_EVT_DATA){
    AwsFrameInfo * info = (AwsFrameInfo*)arg;
    if(info->final && info->index == 0 && info->len == len)
    {
      //the whole message is in a single frame and we got all of it's data

      if(info->opcode == WS_TEXT)
      {
        data[len] = 0;
        Serial.println("New MSG");
        client->text("12535");  // fails
      }

There is no problem on the server receiving arbitrarly long messages, so it doesn't seem like a buffer issue?

Currently using:

Arduino_MachineControl v.1.1.0 Portenta_H7_AsyncTCP v 1.3.2 Portenta_H7_AsyncWebServer v. 1.2.1

The Portenta is using Arduino Mbed OS Portenta Boards v 3.0.0

khoih-prog / Portenta_H7_AsyncWebServer

Cannot send more than 4 characters from server -> client #5