Async with Socket.IO disconnects and reconnects repeatedly

[LacombeJ]

Enabling async with socket.io causes repeated disconnects and reconnects. Without async this works fine but my issue was that the program was delaying every 5 seconds if connection wasn't found. I believe the issue has to do with the code below. I noticed that cSessionId is empty (in both sync and async) at first but during sync, this value is somehow re-read below. But in async, the cSessionId is never set.

#if(WEBSOCKETS_NETWORK_TYPE != NETWORK_ESP8266_ASYNC)
        } else if(client->isSocketIO) {
            if(client->cSessionId.length() > 0) {
                DEBUG_WEBSOCKETS("[WS-Client][handleHeader] found cSessionId\n");
                if(clientIsConnected(client) && _client.tcp->available()) {
                    // read not needed data
                    DEBUG_WEBSOCKETS("[WS-Client][handleHeader] still data in buffer (%d), clean up.\n", _client.tcp->available());
                    while(_client.tcp->available() > 0) {
                        _client.tcp->read();
                    }
                }
                sendHeader(client);
            }
#endif

Maybe the issue is something else, but this is part of the error I am seeing with async on:

[WS-Client][handleHeader]  - cSessionId: 
[WS-Client][handleHeader] still missing cSessionId try socket.io V3
[WS-Server][0] Disconnect client
[WS-Client] asyncConnect...

And with sync:

[WS-Client][handleHeader]  - cSessionId: 
[WS-Client][handleHeader] still missing cSessionId try socket.io V3
[WS-Client][handleHeader] socket.io json: 118:0{"sid":"VddgreoCPZTlh1YyAAE9","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":20000,"maxPayload":1000000}
[WS-Client][handleHeader]  - cSessionId: VddgreoCPZTlh1YyAAE9
[WS-Client][handleHeader] Header read fin.

[guotingchao]

same probleam