int GSMInterface::sendPacket(String server, int port, String packet)
{
if(!openTCPSocket(server, port))
return 500;
int packetSize = packet.length()-1;
serialinterface->printToGSM("AT+QISEND=" + String(packetSize));
serialinterface->printToGSM('\r');
delay(100);
serialinterface->printToGSM(packet);
if(serialinterface->pollForResponseFromCommand("", "OK", false))
{
delay(100);
//closeTCPSocket();
return 200;
}
else
{
closeTCPSocket();
return 501;
}
}
int main(int argc, char *argv[])
{
if (argc != 4) {
fprintf(stderr,"Usage: ./router localhost TCP UDP\n");
exit(1);
}
int tcpsockfd,udplistener, numbytes;
int i;
struct LINK newLink;
char buf[MAXDATASIZE];
char* pBuf = NULL;
char sendbuf[MAXDATASIZE];
char tempbuf[MAXDATASIZE];
struct timeval tval; // time out for select()
fd_set readfds; // read fds for select()
int ret;
FILE *socket_stream_in;
struct NetworkTopoStruct* networkTopo = initNetworkTopo();
pGlobalTopo = networkTopo;
/* initialize random seed: */
srand ( time(NULL) );
// open tcp
tcpsockfd = openTCPSocket(argv[1],argv[2]);
socket_stream_in = fdopen(tcpsockfd, "r");
// open the udp listener
udplistener = openUDPListenningSocket(argv[3]);
// get my address
sendmessage(tcpsockfd,"HELO\n");
numbytes = recv(tcpsockfd, buf, MAXDATASIZE-1, 0);
buf[numbytes] = '\0';
pBuf = buf+5;
printf("manager replied with address %s",pBuf);
storesMyAddress(buf,networkTopo); // Stores my address into the database.
// register the host with udpport
sprintf(sendbuf,"HOST localhost %s\n",argv[3]);
sendmessage(tcpsockfd,sendbuf);
receive(tcpsockfd,buf); // this is OK
// retrive the neighbour links
sendmessage(tcpsockfd,"NEIGH?\n");
do{
if ( fgets(buf,MAXDATASIZE-1,socket_stream_in)!=NULL ){
printf("%s",buf);
if (isControlInfo(buf,"NEIGH")){
storesNeighFromControlInfo(buf,networkTopo); // stores the neigh information
}
if (isControlInfo(buf,"DONE")) break;
}
}while(1);
sendmessage(tcpsockfd,"READY\n");
receive(tcpsockfd,buf); // This is OK
// Until here, the handshake is done
// LOG Information
sendmessage(tcpsockfd,"LOG ON\n");
receive(tcpsockfd,buf); // This is LOG ON replied from the server
// initialize select() to do multiplexing I/O
tval.tv_sec = 0;
tval.tv_usec = 80000;
FD_ZERO(&readfds);
FD_SET(tcpsockfd,&readfds); // input from the tcp
FD_SET(udplistener,&readfds); // input from the udp
//Broadcast the neighbour links to all nodes to set up the topology of the network
for(i=0;i<networkTopo->linkNum;i++)
{
broadCastLinkInfo(3,networkTopo->Links[i],networkTopo);
}
// the loop for the select(), and dealing with the input from keyboard and the input from socket.
while( (ret=select(max(tcpsockfd,udplistener)+1, &readfds, NULL, NULL, NULL)) >=0 )
{
if (FD_ISSET(tcpsockfd,&readfds))
{
if (receiveOneLine(socket_stream_in,buf)){
// update and acknowledge link cost
if (isControlInfo(buf,"LINKCOST")){
// fetch the cost
fetchToken(buf,3,tempbuf); // the cost is in tempbuf
sprintf(sendbuf,"COST %s OK\n",tempbuf);
sendmessage(tcpsockfd,sendbuf);
newLink = storesLinkCostChangeFromControlInfo(buf,networkTopo); // save the link cost change in the data structure and broadcast the change
broadCastLinkInfo(4,newLink,networkTopo);
}
//break if received end
if (isControlInfo(buf,"END")){
sleep((rand()%200+100)/300);
sendmessage(tcpsockfd,"BYE\n");
break;
}
}
}
if (FD_ISSET(udplistener,&readfds))
{
if((numbytes = receiveUDPMessage(udplistener,buf)) >0){
dealWithUDPMessage(buf,numbytes, networkTopo,tcpsockfd); // forward message or deal with control information between routers
}
}
FD_ZERO(&readfds);
FD_SET(tcpsockfd,&readfds); // got message from the tcp
FD_SET(udplistener,&readfds); // got message from the udp server input
}
if (ret==-1){
perror("select()");
exit(1);
}
freeTopo(networkTopo); // release the networkTopo
close(udplistener);
close(tcpsockfd);
return 0;
}
