/******************************************************************************
*
* @brief On packet reception, process the data
* BSL-based protocol expects:
* HEADER = 0x80
* Lenght = lenght of CMD + [ADDR] + [DATA]
* CMD = 1 byte with the corresponding command
* ADDR = optional address depending on command
* DATA = optional data depending on command
* CHKSUM = 2 bytes (L:H) with CRC checksum of CMD + [ADDR] + [DATA]
*
* @return RET_OK: Communication protocol in progress
* RET_JUMP_TO_APP: Last byte received, request jump to application
*****************************************************************************/
uint8_t TI_MSPBoot_CI_Process(void)
{
uint8_t ret = RET_NO_DATA;
uint8_t sendAck;
if (readPacket()) // On complete packet reception
{
if ((gPacket.length > PACKET_DESTINATION) &&
(gPacket.data[PACKET_PROTOCOL] == MSP430_BSL_PROTOCOL) &&
(gPacket.data[PACKET_DESTINATION] == gPacket.myAddr)) {
sendAck = verifyPacket();
ackPacket(sendAck);
if (sendAck == ACK)
{
/* CI_CMD_Intepreter will set up the packet response */
ret = CI_CMD_Intepreter();
updatePacket();
writePacket();
}
}
packetReset();
}
return ret;
}
void QueueController::sendAck(PIA &packet) {
PIA ackPacket(settings->getLocalIP(), //IPaddr
packet.getSourceAddress(), //IPaddr
0, //sequencenr
packet.getSequenceNumber() + 1, //acknr
true, //ACK flag
false, //NTA flag
"ack!" //payload
);
sendQueue->push_back(ackPacket, true);
}
bool Nordic::sendCommand(byte target, byte direction, byte time){
byte data[2] = {direction, time};
//Packet packet(seq_num, target, ID, COMMAND, data);
Packet packet(conversation->getNextSeqNum(target), target, ID, COMMAND, data);
conversation->update(packet);
byte taddr[5] = {0, 0, 0, 0, target};
//Mirf.setTADDR(taddr);
bool gotACK = false;
for (int t=TIMEOUT; t>=0 && !gotACK; t--){
Mirf.send(packet.pack());
while (Mirf.isSending());
Serial.println("Sent packet");
//Serial.print("Of type: ");
//Serial.println(packet.getType());
packet.print(DEC);
byte ack[sizeof(Packet)];
for (int i = 5; i >= 0; i--){
if (Mirf.dataReady()){
break;
}
delay(10);
}
if (Mirf.dataReady()){
Mirf.getData(ack);
Packet ackPacket(ack);
if (ackPacket.getSequenceNumber() == packet.getSequenceNumber() &&
ackPacket.getSourceId() == packet.getTargetId() &&
ackPacket.getTargetId() == packet.getSourceId() &&
ackPacket.getType() == ACK){
Serial.println("Got ACK");
gotACK = true;
}
}
}
return gotACK;
}
bool Nordic::passToken(byte target){
bool gotACK = false;
if (hasToken()){
byte data[2] = {0,0};
Packet packet(conversation->getNextSeqNum(target), target, ID, TOKEN, data);
conversation->update(packet);
byte taddr[5] = {0,0,0,0,target};
for (int t=TIMEOUT; t >= 0 && !gotACK; t--){
Mirf.send(packet.pack());
while (Mirf.isSending());
Serial.println("Sent token");
packet.print(DEC);
byte ack[sizeof(Packet)];
for (int i = 5; i >= 0; i--){
if (Mirf.dataReady()){
break;
}
delay(10);
}
if (Mirf.dataReady()){
Mirf.getData(ack);
Packet ackPacket(ack);
if (ackPacket.getSequenceNumber() == packet.getSequenceNumber() &&
ackPacket.getSourceId() == packet.getTargetId() &&
ackPacket.getTargetId() == packet.getSourceId() &&
ackPacket.getType() == ACK){
Serial.println("Got ACK");
gotACK = true;
token = false;
}
}
}
}
return gotACK;
}
TcpConnection::TcpConnection(char* ip, int port) {
struct sockaddr_in myaddr, remaddr;
int fd, slen = sizeof(remaddr);
char buf[BUFLEN]; /* message buffer */
int recvlen; /* # bytes in acknowledgement message */
srand((int) time(NULL));
bool flags[] = { false, false, false, false, false, false, false, true, false };
seqNo = rand() % 10000;
TcpPacket synPacket(seqNo, rand(), flags, 1u, time(0), PACKET_SIZE, nullptr);
/* Initialize Network */
Network network = Network();
/* create a socket */
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
printf("socket created\n");
/* bind it to all local addresses and pick any port number */
memset((char *) &myaddr, 0, sizeof(myaddr));
myaddr.sin_family = AF_INET;
myaddr.sin_addr.s_addr = htonl(INADDR_ANY);
myaddr.sin_port = htons(0);
if (bind(fd, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
perror("bind failed");
return;
}
/* now define remaddr, the address to whom we want to send messages */
/* For convenience, the host address is expressed as a numeric IP address */
/* that we will convert to a binary format via inet_aton */
memset((char *) &remaddr, 0, sizeof(remaddr));
remaddr.sin_family = AF_INET;
remaddr.sin_port = htons(SERVICE_PORT);
if (inet_pton(remaddr.sin_family, SERVER, &remaddr.sin_addr) == 0) {
fprintf(stderr, "inet_pton() failed\n");
exit(1);
}
/* Set socket timeout */
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 100000;
if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (char *) &tv, sizeof(tv)) < 0) {
perror("socket timeout set failed");
exit(1);
}
printf("Sending packet to %s port %d\n", SERVER, SERVICE_PORT);
if (sendto(fd, synPacket.buf, PACKET_SIZE, 0, (struct sockaddr *)&remaddr, slen) == -1) {
perror("sendto");
exit(1);
}
printf("syn packet sent\n");
/* now receive an acknowledgement from the server */
recvlen = recvfrom(fd, buf, BUFLEN, 0, (struct sockaddr *)&remaddr, &slen);
if (recvlen >= 0) {
/* check if ACK & SYN flag set in response*/
bool* Aflags = TcpPacket::getFlags(buf);
if (*(Aflags + ACKBIT) && *(Aflags + SYNBIT)) {
printf("Ack received\n");
char* seqno = TcpPacket::getBytes(buf, 0, SEQUENCE_SIZE);
int AseqNo = atoi(seqno);
char* ackno = TcpPacket::getBytes(buf, SEQUENCE_SIZE, ACK_SIZE);
int ano = atoi(ackno);
if (ano != seqNo + 1) {
perror("seq error mismtach");
exit(1);
}
/* construct ack for the packet just received*/
bool flags[] = { false, false, false, false, true, false, false, false, false };
seqNo++;
TcpPacket ackPacket(seqNo, AseqNo + 1, flags, 1u, time(0), PACKET_SIZE, nullptr);
if (sendto(fd, ackPacket.buf, PACKET_SIZE, 0, (struct sockaddr *)&remaddr, slen) == -1) {
perror("ackPacket");
exit(1);
}
printf("Three way handshake complete\n");
/* Free memory */
free(seqno);
free(ackno);
} else {
perror("Ack not received");
exit(1);
}
free(Aflags);
}
closesocket(fd);
}