libwebsocket send payload limitation

Question

I'm having libwebsocket client to send binary data. I've saved my binary data into a buffer [i.e. buf] and writing to socket.

n = libwebsocket_write(wsi,
       &buf[LWS_SEND_BUFFER_PRE_PADDING], l, opts | LWS_WRITE_BINARY);

My problem is socket is able to write 22392 bytes only [As I've received n= 22392]. when my l >=22392 bytes it is noticed as partial write. This value varies for various architectures.

Question:

• Is there any limitation of data size in libwebsocket?

• Any way to extend the buffer payload value?

Answer 1

I got the answer for my question. That is the payload value which prevented my data. Adjust the payload value according to the data size.

struct libwebsocket_protocols {
   const char * name;
   callback_function * callback;
   size_t per_session_data_size;
   size_t rx_buffer_size;
   unsigned int id;
   struct libwebsocket_context * owning_server;
   int protocol_index;
};

rx_buffer_size
you should set this to the size of the biggest legal frame that you support.

After setting rx_buffer_size to 65536 I'm able to write data completely.

Here's links helped to me
https://libwebsockets.org/trac/libwebsockets/ticket/40
https://libwebsockets.org/libwebsockets-api-doc.html