INJECTION: recv: No buffer space available

[Evangeline0]

Dear Daniel ,now I got the injection's scripts work correctly, but the receiver receive handreds of packets , then it stops and shows that: recv: No buffer space available .How to figure it out？
Looking for your favourite reply.

[dhalperi]

You're probably injecting too many packets at too high a rate for the transmitter to keep up. Try adding an inter-packet delay or reducing the number or size of packets.

See also #22

[Evangeline0]

@dhalperi
Thanks for your reply!
I have seen issue#22, it said that he(or she) just increased the scheduling priority of the process log_to_file, but I don't know how to do it. I want to add a delay,but I don't know where to put?
Can you tell me some details?
Thank you!

[dhalperi]

google "linux increase scheduling priority" – will probably find you the right thing

injection has a delay parameter – please read the code for the program

[Evangeline0]

Thanks so much, I have work it out.
I still have a question, I get the CSI information from multiple 'transmitters' at the same time, how can I separate the packets from different transmitters.
Looking for your favourite reply.
Thank u!

[dhalperi]

Glad it worked!

Separating out injected CSI from many transmitters is not something the code currently supports; you will need to be clever and perhaps modify the code to do. Maybe put some special bytes in the packet payload to identify each individual transmitter, for example?

[ozawali]

@Evangeline0 Hello , I met some problems when I use the injection mode. because I cannot download the LORCONv1 or maybe I ignore somethings Thank you very much!

[libing64]

@dhalperi
Separating out injected CSI from many transmitters is not something the code currently supports; you will need to be clever and perhaps modify the code to do. Maybe put some special bytes in the packet payload to identify each individual transmitter, for example?

I generate some bytes and send through the transmitter, but I can not find these bytes in the receiver buffer, can you give me some advice about extracting the custom packet?
Here is my code at receiver part,

int ret = recv(sock_fd, netlink_buffer, sizeof(netlink_buffer), 0);
    if (ret == -1) {
        perror("netlink recv");
        return ret;
    }

    //> test
    printf("\nNLMSG_LEN:  %d", NLMSG_LENGTH(0));
    printf("\nret:  %d\n", ret);
    for(int i = 0; i < ret; i++)
    {
        printf("%02hhx, ", netlink_buffer[i]);
    }

    /* Pull out the message portion and print some stats */
    struct cn_msg *cmsg = (struct cn_msg*)NLMSG_DATA(netlink_buffer);
/*  printf("received %d bytes: id: %u val: %u seq: %u clen: %d\n", */
/*          cmsg->len, cmsg->id.idx, cmsg->id.val, */
/*          cmsg->seq, cmsg->len); */
    *buf = cmsg->data;
    *len = cmsg->len;

The csi data is in the netlink_buffer, however, there seems no my own packet.

[dhalperi]

You need to record the packet payload (MPDU) in order to see which device transmitted the packet.

#101