/**
* @brief Process Network
* @param None
* @retval None
*/
void Network_Process(void)
{
static uint8_t arp_counter = 0;
int i;
for (i = 0; i < UIP_CONNS; i++)
{
uip_periodic(i);
if (uip_len > 0)
{
uip_arp_out();
enc28j60_send_packet((uint8_t *)uip_buf, uip_len);
}
}
#if UIP_UDP
for (i = 0; i < UIP_UDP_CONNS; i++)
{
uip_udp_periodic(i);
if (uip_len > 0)
{
uip_arp_out();
network_send();
}
}
#endif /* UIP_UDP */
if (++arp_counter >= 50)
{
arp_counter = 0;
uip_arp_timer();
}
uip_len = enc28j60_recv_packet((uint8_t *)uip_buf, UIP_BUFSIZE);
if (uip_len > 0)
{
if (((struct uip_eth_hdr *)&uip_buf[0])->type == htons(UIP_ETHTYPE_IP))
{
uip_arp_ipin();
uip_input();
if (uip_len > 0)
{
uip_arp_out();
enc28j60_send_packet((uint8_t *)uip_buf, uip_len);
}
}
else if (((struct uip_eth_hdr *)&uip_buf[0])->type == htons(UIP_ETHTYPE_ARP))
{
uip_arp_arpin();
if (uip_len > 0)
{
enc28j60_send_packet((uint8_t *)uip_buf, uip_len);
}
}
}
}
void sendCoapMsg(uint8_t* packet, CoapMsg* coapMsg, char *payload) {
coapMsg->coapHdr = (CoapHdr*) packet;
//Reset options
coapMsg->options = (CoapOptions) COAP_OPTIONS_INITIALISATION;
//Swap source and destination MAC addresses
memcpy(coapMsg->coapHdr->udp.ip.eth.DestAddrs,
coapMsg->coapHdr->udp.ip.eth.SrcAddrs, sizeof(deviceMAC));
memcpy(coapMsg->coapHdr->udp.ip.eth.SrcAddrs, deviceMAC, sizeof(deviceMAC));
//Swap source and destination IP addresses
memcpy(coapMsg->coapHdr->udp.ip.dest, coapMsg->coapHdr->udp.ip.source,
sizeof(deviceIP));
memcpy(coapMsg->coapHdr->udp.ip.source, deviceIP, sizeof(deviceIP));
//Swap ports
uint16_t destPort = coapMsg->coapHdr->udp.destPort;
coapMsg->coapHdr->udp.destPort = coapMsg->coapHdr->udp.sourcePort;
coapMsg->coapHdr->udp.sourcePort = destPort;
//Setup CoAP response
if (coapMsg->coapHdr->type == COAP_TYPE_CONFIRMABLE)
coapMsg->coapHdr->type = COAP_TYPE_ACKNOWLEDGEMENT;
coapMsg->coapHdr->code = COAP_CODE_CONTENT;
//Payload marker
uint8_t ff = 0xFF;
printf("Token length: %u\r", coapMsg->coapHdr->tokenLength);
memcpy(packet + sizeof(CoapHdr) + coapMsg->coapHdr->tokenLength, &ff, 1);
//Payload
uint8_t payloadLen = strlen(payload);
memcpy(packet + sizeof(CoapHdr) + coapMsg->coapHdr->tokenLength + 1,
payload, payloadLen);
//Total packet length
uint16_t len = sizeof(CoapHdr) + coapMsg->coapHdr->tokenLength + 1
+ payloadLen;
//Setup UDP packet
coapMsg->coapHdr->udp.len = (uint16_t) HTONS((len-sizeof(IPhdr)));
coapMsg->coapHdr->udp.ip.len = (uint16_t) HTONS((len-sizeof(EtherNetII)));
coapMsg->coapHdr->udp.ip.ident = 0xdeee;
//Calculate UDP and IP checksums
coapMsg->coapHdr->udp.chksum = 0;
coapMsg->coapHdr->udp.ip.chksum = 0;
uint16_t pseudochksum = (uint16_t) chksum(UDPPROTOCOL + len - sizeof(IPhdr),
coapMsg->coapHdr->udp.ip.source, sizeof(deviceIP) * 2);
uint16_t chk1, chk2;
chk1 = ~(chksum(pseudochksum, packet + sizeof(IPhdr), len - sizeof(IPhdr)));
coapMsg->coapHdr->udp.chksum = (uint16_t) HTONS(chk1);
chk2 = ~(chksum(0, packet + sizeof(EtherNetII),
sizeof(IPhdr) - sizeof(EtherNetII)));
coapMsg->coapHdr->udp.ip.chksum = (uint16_t) HTONS(chk2);
//Send packet
enc28j60_send_packet(packet, len);
usartSendString("\rCoAP message sent OK\r");
}
