Simple UDP communication

sergemonnerat — Fri, 09 Nov 2012 09:39:51 GMT

Hello,

I try to setup a simple udp communication between an UDP client on my PC and the K60 tower. I have wireshark on the PC and I see the outgoing frame to the K60. I have follow the socket example Quote of the Day in the Freescale MQX™ RTCS™ User’s Guide.

When I run the app on the board the RTCS_selectall function return immediately (before I send anything through the network) with a valid socket number but when I read the datas with the recvfrom function the IP address, the TCP port and the datas are 0. Afterthat when I try to send UDP frame's the selectall function never detect activity on the socket. Thank for your help. The udp task that I write:

/*TASK*-----------------------------------------------------------------

* Function Name : udp_task

* Returned Value : void

* Comments :

*END------------------------------------------------------------------*/

void udp_task(uint_32 temp)

{

static uint_32 sSocketHndl;

static uint_32 sListenSocketHndl;

static uint_16 sRemoteRxLengh;

static int_32 sNbOfByteReceived;

static int_32 sNbOfByteTransmit;

static sockaddr_in sLocalAddr;

static sockaddr_in sRemoteTxAddr;

static sockaddr_in sRemoteRxAddr;

static uchar sUdpRemoteBuffer[kUDP_BUF_LEN];

static int_32 error;

static uint_32 sUerror;

static _enet_handle sEthernetHandle;

static _rtcs_if_handle sRTCSHandle;

static _enet_address sMacAddress;

/* We are running on a memory constrained device, lower RTCS's defaults */

/* runtime RTCS configuration */

_RTCSPCB_init = 4;

_RTCSPCB_grow = 2;

_RTCSPCB_max = 6;

_RTCS_msgpool_init = 4;

_RTCS_msgpool_grow = 2;

_RTCS_msgpool_max = 8;

_RTCS_socket_part_init = 4;

_RTCS_socket_part_grow = 2;

_RTCS_socket_part_max = 6;

_RTCSTASK_stacksize = 2200;

error = RTCS_create();

ENET_get_mac_address(DEMOCFG_DEFAULT_DEVICE, ENET_IPADDR, sMacAddress);

sUerror = ENET_initialize(DEMOCFG_DEFAULT_DEVICE,sMacAddress, 0, &sEthernetHandle);

if(sUerror!=ENET_OK)

_task_block();

sUerror = RTCS_if_add(sEthernetHandle, RTCS_IF_ENET, &sRTCSHandle);

if(sUerror!=RTCS_OK)

_task_block();

sUerror = RTCS_if_bind(sRTCSHandle, ENET_IPADDR, ENET_IPMASK);

if(sUerror!=RTCS_OK)

_task_block();

// Config du gateway address

/*sUerror = RTCS_gate_add(ENET_IPGATEWAY, INADDR_ANY, INADDR_ANY);

if(sUerror!=RTCS_OK)

_task_block();*/

sSocketHndl = socket(PF_INET, SOCK_DGRAM, 0);

if(sSocketHndl == RTCS_SOCKET_ERROR)

_task_block();

sLocalAddr.sin_family = AF_INET;

sLocalAddr.sin_port = 10;

sLocalAddr.sin_addr.s_addr = IPADDR(157,26,100,93);//INADDR_ANY;

sUerror = bind(sSocketHndl, &sLocalAddr, sizeof(sLocalAddr));

if(sUerror != RTCS_OK)

_task_block();

sListenSocketHndl=sSocketHndl;

sRemoteTxAddr.sin_family = AF_INET;

sRemoteTxAddr.sin_port = 8;

sRemoteTxAddr.sin_addr.s_addr = IPADDR(157,26,100,78);

sUerror=connect(sListenSocketHndl, &sRemoteTxAddr, sizeof(sRemoteTxAddr));

if(sUerror != RTCS_OK)

_task_block();

while(1)

{

sSocketHndl = RTCS_selectall(0);

if(sSocketHndl == RTCS_SOCKET_ERROR)

_task_block();

if(sSocketHndl==sListenSocketHndl)

{

memset(&sRemoteRxAddr, 0, sizeof(sRemoteRxAddr));

memset(&sUdpRemoteBuffer,0, kUDP_BUF_LEN); //clean out buffer

sRemoteRxLengh = sizeof(sRemoteRxAddr);

sNbOfByteReceived = recvfrom(sSocketHndl, sUdpRemoteBuffer, kUDP_BUF_LEN, 0, &sRemoteRxAddr, &sRemoteRxLengh);

if (sNbOfByteReceived == RTCS_ERROR)

_task_block();

sRemoteRxAddr.sin_addr.s_addr=INADDR_BROADCAST;

sRemoteRxLengh = sizeof(sRemoteRxLengh);

sNbOfByteTransmit = sendto(sSocketHndl,"Fuck hackers",13,RTCS_MSG_NOLOOP,&sRemoteRxAddr, sRemoteRxLengh);

if (sNbOfByteTransmit == RTCS_ERROR)

_task_block();

}

Re: Simple UDP communication

Luis_Garabo — Thu, 31 Jan 2013 03:09:38 GMT

Hi,

Some time ago I developed this code about a UDP Server. I am attaching here. I hope it helps you.

You also may find useful the appnote:

http://cache.freescale.com/files/32bit/doc/app_note/AN4644.pdf?fsrch=1&sr=3

http://cache.freescale.com/files/32bit/doc/app_note/AN4644SW.zip?fsrch=1&sr=3

Regards,

-Garabo

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Simple UDP communication

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