Non-blocking UDP receive problem - Error 0x1120

[michael_wahler]

Hi,

I'd like to receive UDP packets in a non-blocking way. The problem is that recvfrom returns error 0x1120.

Here's how I initialize the UDP socket:

socket_handle = socket(AF_INET, SOCK_DGRAM, 0);

server_socket_addr.sin_family      = AF_INET;

server_socket_addr.sin_port        = port;

server_socket_addr.sin_addr.s_addr = INADDR_ANY;

status = bind(socket_handle, &server_socket_addr, sizeof(server_socket_addr));

uint32_t opt_value = TRUE;

uint32_t opt_length = sizeof (uint32_t);

status = setsockopt (

  socket_handle,

  SOL_UDP,

  OPT_RECEIVE_NOWAIT,

  &opt_value,

  opt_length

  );

_UDP_max_queue_size = 1;

Cyclically, I call

recvfrom(socket_handle, buffer, sizeof(buffer), 0, &client_socket_addr, &socket_addr_len)

But this line returns error 0x1120. In rtcs_err.h the corresponding line says

     #define RTCSERR_OUT_OF_BUFFERS          (RTCS_ERROR_BASE|0x120)

Any ideas how to solve this problem? The blocking variant works, by the way.

Kind regards

Michael

--

Setup: CW 10.6, MQX 4.1, TWR-K60F120M

[Martin_]

It might be application specific configuration of system resources available for RTCS. Try to increase those before RTCS_create() in similar way as in the example below:

  /* Init RTCS */
  _RTCSPCB_init = 4;
  _RTCSPCB_grow = 2;
  _RTCSPCB_max = 20;
  _RTCS_msgpool_init = 4;
  _RTCS_msgpool_grow = 2;
  _RTCS_msgpool_max  = 20;
  _RTCS_socket_part_init = 4;
  _RTCS_socket_part_grow = 2;
  _RTCS_socket_part_max  = 20;
  _UDP_max_queue_size = 100;

  _RTCSTASK_stacksize = 4500;

  error = RTCS_create();

[michael_wahler]

Thanks for your answer. Unfortunately, this does not help. With these parameters, recvfrom receives an empty buffer 20 times and then fails with the same error again.

Any other ideas?

[Martin_]

Then please check the priority of your application task and compare with the priority of TCP/IP task. By default the priority of TCP/IP task is set to 6. Your application task shall have lower priority (higher number = 7, 8 ...).

Seems like you don't allow the TCP/IP task to service and free the allocated messages, that might be MQX task priority problem.

[michael_wahler]

Hi Martin,

I checked the priorities of my tasks:

TCP/IP task - prio 6

Main task (MQX_AUTO_START_TASK) - prio 9

  - spawns hw timer task - prio 7

Still not working though :smileysad: Any other ideas?

Michael