// Return the IP address of the host who sent the current incoming packet
IPAddress
UIPUDP::remoteIP()
{
return _uip_udp_conn ? ip_addr_uip(_uip_udp_conn->ripaddr) : IPAddress();
}
void UIPUDP::uip_callback(uip_udp_appstate_t *s) {
if (appdata_t *data = (appdata_t *)s->user)
{
if (uip_newdata())
{
data->rport = ntohs(UDPBUF->srcport);
data->ripaddr = ip_addr_uip(UDPBUF->srcipaddr);
memhandle *packet = &data->packets_in[0];
uint8_t i = 0;
do
{
if (*packet == NOBLOCK)
{
*packet = UIPEthernet.network.allocBlock(ntohs(UDPBUF->udplen)-UIP_UDPH_LEN);
//if we are unable to allocate memory the packet is dropped. udp doesn't guarantee packet delivery
if (*packet != NOBLOCK)
{
//discard Linklevel and IP and udp-header and any trailing bytes:
UIPEthernet.network.copyPacket(*packet,0,UIPEthernet.in_packet,UIP_UDP_PHYH_LEN,UIPEthernet.network.blockSize(*packet));
#ifdef UIPETHERNET_DEBUG_UDP
Serial.print("udp, uip_newdata received packet: ");
Serial.print(*packet);
Serial.print(", slot: ");
Serial.print(i);
Serial.print(", size: ");
Serial.println(UIPEthernet.network.blockSize(*packet));
#endif
break;
}
}
packet++;
i++;
}
while (i < UIP_UDP_NUMPACKETS);
}
if (uip_poll() && data->send)
{
//set uip_slen (uip private) by calling uip_udp_send
#ifdef UIPETHERNET_DEBUG_UDP
Serial.print("udp, uip_poll preparing packet to send: ");
Serial.print(data->packet_out);
Serial.print(", size: ");
Serial.println(UIPEthernet.network.blockSize(data->packet_out));
#endif
UIPEthernet.uip_packet = data->packet_out;
data->packet_out = NOBLOCK;
UIPEthernet.uip_hdrlen = UIP_UDP_PHYH_LEN;
UIPEthernet.packetstate |= UIPETHERNET_SENDPACKET;
uip_udp_send(data->out_pos - (UIP_OUTPACKETOFFSET + UIP_UDP_PHYH_LEN));
uip_process(UIP_UDP_SEND_CONN); //generate udp + ip headers
uip_arp_out(); //add arp
if (uip_len == UIP_ARPHDRSIZE)
{
UIPEthernet.packetstate &= ~UIPETHERNET_SENDPACKET;
#ifdef UIPETHERNET_DEBUG_UDP
Serial.println("udp, uip_poll results in ARP-packet");
#endif
}
else
//arp found ethaddr for ip (otherwise packet is replaced by arp-request)
{
data->send = false;
#ifdef UIPETHERNET_DEBUG_UDP
Serial.print("udp, uip_packet to send: ");
Serial.println(UIPEthernet.uip_packet);
#endif
}
}
}
}
