Re: [lwip-users] How to find out if I can send out more UDP packets?

[Xun Chen]

Sergio, Thanks for your reply. I was out of the country until today, 
sorry for the late reply

The problem is similar to the following pseudo codes:

while (1)
{
    p=pbuf_alloc()
    memcopy (p->payload,...)
    err=     udp_sendto (...)
    pbuf_free(p)

    /*if I delay a little here, err will be 0, otherwise, it will 
generate -1 eventually*/
}

Maybe I should track down the return from pbuf_alloc to confirm that I 
indeed have a valid buffer

> Message: 1
> Date: Mon, 15 May 2017 09:54:53 -0300
> From: "Sergio R. Caprile" <address@hidden>
> To: address@hidden
> Subject: Re: [lwip-users] How to find out if I can send out more UDP
>         packets?
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> sendto adds a header to the pbuf you allocated and calls the send
> function on your driver, so, basically, if you don't have an RTOS or
> some esoteric magic around, I don't see how can you be running out of
> memory unless your driver or other application is also using it and you
> don't free it.
> Could you describe your scenario so we can make an educated guess ?