Wrong data sent to C++ libWebSockets server

[Gleeno]

I' m using esp8266 with this library to connect as a client to a C++ websocket server.
With "WebSocketClient" example, connection and handshake complete successfully, but when I send a simple text message (like "hello"), the C++ server receive the "hello" text, plus some incomprehnsible characters.
In addition, my server crash because the message is always bigger than buffer of server, whatever the size.
All libs are RFC6455 (websocket v13) compilant.
Here part of ESP8266 log:

[WS-Client][handleHeader] Websocket connection init done.
[WS][0][headerDone] Header Handling Done (0us).
Connection: Upgrade
[WS-Client][handleHeader] RX: Sec-WebSocket-Accept: wF4RQ16RitGys2E5mhs0fSeme] fin: 1 opCode: 2 mask: 1 length: 1 headerToPayload: 0
[WS][0][sendFrame] pack to one TCP package...
JUSM=
[WS-Client][handleHeader] RX: Sec-WebSocket-Protocol: instruction_protocol
[WS-Client][handleHeader] Header read fin.
[WS-Client][handleHeader] Client[WSc] Connected to url: /
[WS][0][sendFrame] ------- send massage frame -------
[WS][0][sendFra[WS][0][sendFrame] sending Frame Done (42313us).
[WS-Client] connection lost.
[WS-Client] client disconnected.
[WSc] Disconnected!

And here C++ Server

[1454767129:5654] NOTICE: Libwebsockets version: 1.6.0 5086597
[1454767129:5654] NOTICE: IPV6 not compiled in
[1454767129:5654] NOTICE: libev support not compiled in
[1454767129:5654] NOTICE: Threads: 1 each 4096 fds
[1454767129:5654] NOTICE: mem: platform fd map: 32768 bytes
[1454767129:5654] NOTICE: mem: per-conn: 368 bytes + protocol rx buf
[1454767129:5655] NOTICE: canonical_hostname = teo-laptop
[1454767129:5655] NOTICE: Compiled with OpenSSL support
[1454767129:5655] NOTICE: Using non-SSL mode
[1454767129:5669] NOTICE: Listening on port 9002
Client connected. Ip: 192.168.1.9 Name: ESP_D56E95
Instr: size=3002370 and cont=s
RUN FINISHED; Aborted; real time: 4s; user: 0ms; system: 0ms

Someone can help me ?

[Links2004]

your log from the ESP looks like the serial has lost some data.
[WS][0][sendFra[WS][0][s and here: RQ16RitGys2E5mhs0fSeme] fin:
which version of the WS and core are you using?
and in which mode sync or async TCP?

[Gleeno]

Version of WS is 1.4, last commit, TCP in sync mode.
Version of Arduino core for ESP8266 is 2.1.0-rc2.
Message sent is the character "s"

[Links2004]

have send the message (s) from ESP in client and server mode not have any problems here.
server is nodejs, and client is chrome.

can you check if nodejs is working as server in you case?
https://github.com/Links2004/arduinoWebSockets/tree/master/tests/webSocketServer

[Gleeno]

Yes, it works with node.js, so i suppose it's cpp libewbsockets issue. Thanks.