[Libwebsockets] Issue sending data

Derrill Vezina dvezina at caron-eng.com
Tue Jan 3 04:19:02 CET 2017


Excellent! I can't believe I missed that :) Thank you!

Best regards,

DV

> On Jan 2, 2017, at 5:28 PM, Andy Green <andy at warmcat.com> wrote:
> 
>> On Mon, 2017-01-02 at 21:50 +0000, Derrill Vezina wrote:
>> I am currently using libwebsockets to act as a websocket server from
>> the most up to date git repository master branch with a very simple
>> implementation to get things up and running (this is my first time
>> using the library).
>>  
>> My goal is simply to send a packet out every 2 seconds, and print out
>> any data received by any client. After 2 seconds, I try to call
>> lws_callback_on_writable_all_protocol() to write data and the
>> callback is not firing for LWS_CALLBACK_SERVER_WRITEABLE or
>> LWS_CALLBACK_CLIENT_WRITEABLE.
> 
> That's because your ws connection is connected using "client-protocol", 
> but your code says
> 
>  lws_callback_on_writable_all_protocol(context, protocols);
> 
> that's saying ask for a callback when anybody connected with
> protocols[0] becomes writable.  You want
> 
>  lws_callback_on_writable_all_protocol(context, &protocols[1]);
> 
> since "client-protocol" is the second guy in the protocols[] array.
> 
> Otherwise it looks good already.
> 
> -Andy
> 
>> I have attached main.cpp code I am currently using and the test .html
>> page that I grabbed from the net. After a connection is established,
>> the callback on writeable is not getting fired. Is there something I
>> am missing here with my protocol configuration that someone could
>> help me with that would make it so I am unable to send data?
>>  
>> This is my console output:
>>  
>> [2017/01/02 16:45:03:1580] NOTICE: Initial logging level 7
>> [2017/01/02 16:45:03:1581] NOTICE: Libwebsockets version: 2.1.0 dvez@
>> ubuntu-v2.0.0-217-g58a26eb
>> [2017/01/02 16:45:03:1581] NOTICE: IPV6 not compiled in
>> [2017/01/02 16:45:03:1581] NOTICE: libev support not compiled in
>> [2017/01/02 16:45:03:1581] NOTICE: libuv support not compiled in
>> [2017/01/02 16:45:03:1581] NOTICE:  Threads: 1 each 65536 fds
>> [2017/01/02 16:45:03:1585] NOTICE:  mem: platform fd map: 524288
>> bytes
>> [2017/01/02 16:45:03:1585] NOTICE:  Compiled with OpenSSL support
>> [2017/01/02 16:45:03:1585] NOTICE:  SSL disabled: no
>> LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT
>> [2017/01/02 16:45:03:1585] NOTICE: Creating Vhost 'default' port
>> 4500, 2 protocols, IPv6 off
>> [2017/01/02 16:45:03:1588] NOTICE:  Listening on port 4500
>> [2017/01/02 16:45:03:1588] NOTICE:  mem: per-conn:          568 bytes
>> + protocol rx buf
>> [2017/01/02 16:45:03:1588] NOTICE:  canonical_hostname = ubuntu
>> Websocket server started and is listening
>> [2017/01/02 16:45:03:1599] NOTICE: lws_protocol_init
>> Websocket protocol initialized
>> [2017/01/02 16:45:04:2919] NOTICE: Accepted wsi 0x18dfb90 to context
>> 0x18d6760, tsi 0
>> Websocket session started
>> Data received: Echo
>> Timer expired
>> Websocket has ended session
>> [2017/01/02 16:47:17:5549] NOTICE: lws_context_destroy: ctx 0x18d6760
>> Websocket protocol destroyed
>> [2017/01/02 16:47:17:5555] NOTICE: lws_context_destroy2: ctx
>> 0x18d6760
>>  
>> Best regards,
>>  
>> DV
>> Websocket Server Test
>> View console in developer tools
>> _______________________________________________
>> Libwebsockets mailing list
>> Libwebsockets at ml.libwebsockets.org
>> https://libwebsockets.org/mailman/listinfo/libwebsockets



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