TCP message size

[Meni]

I would like to send TCP message with 50KB message size.
I saw that maximum size was limited by CONFIG_HEAP_MEM_POOL_SIZE which was 16kB.

Is there any way to send that message ?

[jbrzozoski]

Assuming you can build/hold your entire message in RAM ready to go, TCP doesn't explicitly distinguish packets at the application layer, so you can send it as a bunch of smaller chunks back-to-back.  Something like this:

int socket_write(int sock, const u8_t *data, u32_t datalen)
{
   u32_t offset = 0U;
   int ret;

   while (offset < datalen)
   {
      ret = send(sock, data + offset,
                 MIN(2048, (datalen - offset)), 0);
      if (ret < 0)
      {
         return -errno;
      }

      offset += ret;
   }

   return 0;
}