Function sendto

Arduino/libraries/Ethernet2/src/utility/socket.cpp:204–244

* @brief This function is an application I/F function which is used to send the data for other then TCP mode. * Unlike TCP transmission, The peer's destination address and the port is needed. * * @return This function return send data size for success else -1. */

 * @return	This function return send data size for success else -1.
 */
uint16_t sendto(SOCKET s, const uint8_t *buf, uint16_t len, uint8_t *addr, uint16_t port)
{
  uint16_t ret=0;

  if (len > w5500.SSIZE) ret = w5500.SSIZE; // check size not to exceed MAX size.
  else ret = len;

  if
    (
  ((addr[0] == 0x00) && (addr[1] == 0x00) && (addr[2] == 0x00) && (addr[3] == 0x00)) ||
    ((port == 0x00)) ||(ret == 0)
    ) 
  {
    /* +2008.01 [bj] : added return value */
    ret = 0;
  }
  else
  {
    w5500.writeSnDIPR(s, addr);
    w5500.writeSnDPORT(s, port);

    // copy data
    w5500.send_data_processing(s, (uint8_t *)buf, ret);
    w5500.execCmdSn(s, Sock_SEND);

    /* +2008.01 bj */
    while ( (w5500.readSnIR(s) & SnIR::SEND_OK) != SnIR::SEND_OK ) 
    {
      if (w5500.readSnIR(s) & SnIR::TIMEOUT)
      {
        /* +2008.01 [bj]: clear interrupt */
        w5500.writeSnIR(s, (SnIR::SEND_OK | SnIR::TIMEOUT)); /* clear SEND_OK & TIMEOUT */
        return 0;
      }
    }

    /* +2008.01 bj */
    w5500.writeSnIR(s, SnIR::SEND_OK);
  }
  return ret;
}


/**