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NDK stop receiving

Mohammed Fawzy
Expert 1860 points

Hello,

i'm using TM4C129 with XDCtool xdctools_3_31_02_38_core and TI-RTOS tirtos_tivac_2_14_00_10.

and there is an attachment which is the modified sample "udpEchoIPv6_DK_TM4C129X_TI_TivaTM4C129XNCZAD" to work on polling stack instead of waiting forever but i faced the following two problems:

1- if it tried to send a UDP packet with no data (data size is zero), then i won't receive anymore even if i tried to send UDP packet with data, the only way to start receiving once again is to reset the code.

2- if i send a UDP packet length, and i called 

s32NumberOfReadyBytes = recvfrom(s,\
pu8ReceivedData,\
MAX_RX_IP_PACKET_SIZE,\
0,\
(struct sockaddr *)&clientAddr,\
&s32FromAddressLength);

then it won't clear the received data from the NDK queue.

3301.udpEchoIPv6_DK_TM4C129X_TI_TivaTM4C129XNCZAD.rar

Thanks,

Mohammed Fawzy

  • 0
    TI__Mastermind 21645 points

    Hi Mohammed,

    I went through the modified version of "udpEchoIPv6.c" that you shared and it looks like there is a bug in the second recvFrom() call. Please see my remarks below:

    static void SoAd_vSocketUDPRead(int s)
{

    INT8U                     *pu8ReceivedData = NULL;
    INT32S                     s32NumberOfReadyBytes;
    ...

    s32NumberOfReadyBytes = recvfrom(s,\
                                     u8ReceivedData,\
                                     MAX_RX_IP_PACKET_SIZE,\
                                     MSG_PEEK | MSG_DONTWAIT,\
									 (struct sockaddr *)&clientAddr,\
                                     &s32FromAddressLength);
    ....
    if(s32NumberOfReadyBytes > 0)
    {
			s32NumberOfReadyBytes = recvfrom(s,\
											 pu8ReceivedData,\ <-----------puReceivedData is initialized to NULL at
                                                                                                                       the beginning of this function. It should
                                                                                                                       be pointing to a receive buffer.
											 MAX_RX_IP_PACKET_SIZE,\
											 0,\
											 (struct sockaddr *)&clientAddr,\
											 &s32FromAddressLength);
			System_printf("Received packet with length %d", s32NumberOfReadyBytes);
			System_flush();
         ....
    }
}

    Can you fix this and try ?

    Best,

    Ashish

  • 0 in reply to Ashish Kapania
    Expert 1860 points

    Hi Ashish,

    Thank you for your reply, actually you are right about the bug and this was the cause of the second problem but the first problem still exist.

    Mohammed Fawzy

  • 0 in reply to Mohammed Fawzy
    TI__Mastermind 21645 points
    Hi Mohammed,

    Regarding your first problem, receving a UDP packet with no data should be fine. I will have to try creating a similar setup as yours and see if I can reproduce the problem. I will get back to you once I know more.

    Best,
    Ashish