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From: | Dirk Ziegelmeier |
Subject: | Re: [lwip-users] How receive UDP broadcast with LwIP ? |
Date: | Thu, 7 Feb 2019 15:41:39 +0100 |
Hello,
I have this problem. I need to receive UDP Broadcast, but The "callback"
function is never called.
I use LwIP 2.0.3.
/*----- Default Value for IP_SOF_BROADCAST: 0 ---*/
#define IP_SOF_BROADCAST 1
/*----- Default Value for IP_SOF_BROADCAST_RECV: 0 ---*/
#define IP_SOF_BROADCAST_RECV 1
void udp_server_init(void)
{
struct udp_pcb *upcb;
err_t err;
upcb = udp_new();
ip_set_option(upcb, SOF_BROADCAST);
if (upcb)
{
err = udp_bind(upcb, IP_ADDR_BROADCAST, 8000);
if(err == ERR_OK)
{
udp_recv(upcb, udp_receive_callback, NULL);
}
}
}
void udp_receive_callback(void *arg, struct udp_pcb *upcb, struct pbuf *p,
const ip_addr_t *addr, u16_t port)
{
HAL_GPIO_TogglePin(GPIOE, GPIO_PIN_2);
pbuf_free(p); // Free the p buffer
//udp_transmit(upcb, addr, udp2_tx_data, udp2_tx_len);
}
What is wrong ?
Peter
--
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