Re: Programming in C with Bluetooth Sockets
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Re: Programming in C with Bluetooth Sockets
This is the function run by the bluetooth device that will recieve the data.char* BT_Target(){ int s, client, bytes_read, count = 0; char * buf; struct sockaddr_rc loc_addr = { 0 }, rem_addr = { 0 }; int opt = sizeof(rem_addr); unsigned int max_count; //attempt to allocate reception buffer buf = (char *)calloc(MAX_MSG, 1); if(buf == NULL) { perror("No memory!"); return("No memory!"); } //attempt to allocate socket s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); if(s < 0) { perror("socket failed to open:"); return("socket failed to open"); } loc_addr.rc_family = AF_BLUETOOTH; loc_addr.rc_bdaddr = *BDADDR_ANY; loc_addr.rc_channel = (uint8_t) RFCOMM_CHANNEL; //attempt to bind the socket for a maximum number of attempts for( count = 0; count < MAX_ATTEMPTS && bind(s, (struct sockaddr*)&loc_addr, sizeof(loc_addr)) < 0; count++); //if we tried to open the socket but failed if( count == MAX_ATTEMPTS ) { perror("unable to bind socket: "); close(s); free(buf); return "unable to bind socket"; } //attempt to listen if(listen(s, 1) < 0) { perror("listen failed: "); close(s); free(buf); return "listen failed."; } //attempt to accept the socket rem_addr.rc_family = AF_BLUETOOTH; rem_addr.rc_bdaddr = *BDADDR_ANY; rem_addr.rc_channel = (uint8_t) RFCOMM_CHANNEL; client = accept(s, (struct sockaddr *)&rem_addr, &opt); //if we have created a connection //we need to recieve the transmission length into max_count if(client >= 0) { count = 0; fprintf(stderr,"Got a connection\n"); read(client, &max_count, sizeof(unsigned int)); printf( "Message size: %d\n", max_count ); close( client ); } //the accept has failed else { perror("accept failed: "); close(s); free(buf); return("accept failed"); } //while we have not recieved the entire message, get the next part while( count < max_count && ( client = accept(s, (struct sockaddr*)&rem_addr, &opt) ) >= 0 ) { bytes_read = read(client, buf + count, sizeof(buf) - count); fprintf(stderr, "got %d bytes this time\n", bytes_read); count += bytes_read; fprintf(stderr, "recieved %d [%s] so far\n", count, buf); close( client ); if(bytes_read < 0) { perror("socket issue."); fprintf(stderr, "We have socket problems.\n"); close(s); free(buf); close(client); return("We have socket Problems."); } } close(s); close(client); return "Success";}And this is the function that will send the data.char* BT_Source(char* fname, int iter, char* tMAC){ struct sockaddr_rc addr = { 0 }; int s, status, count = 0, fd; char* dest = tMAC; struct stat *stats; unsigned int len = 0; char* buf; //attempt to allocate a socket s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); if(s < 0) { perror("error creating socket: "); return "socket creation failed."; } // set the connection parameters (who to connect to) addr.rc_family = AF_BLUETOOTH; addr.rc_channel = (uint8_t) RFCOMM_CHANNEL; fprintf(stderr, "The dest addr is now %s\n", dest); str2ba(dest, &addr.rc_bdaddr); //attempt to connect the socket for our maximum number of times status = connect(s, (struct sockaddr *)&addr, sizeof(addr)); for(count = 0; status != 0 && count < MAX_ATTEMPTS;) { perror("retrying connection: "); //if the socket is busy or the host is down, close and reopen if(!(errno == EBUSY || errno == EHOSTDOWN)) { close(s); s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); if(s < 0) { perror("error creating socket: "); return "socket creation failed."; } count++; } status = connect(s, (struct sockaddr *)&addr, sizeof(addr)); } //if the socket was opened properly, send a message if(status == 0) { count = 0; //get the file size and send it to the client stat(fname, stats); len = stats->st_size; fprintf(stderr, "The length in bytes is %d\n", len); write(s, &len, sizeof(unsigned int)); //open the file if((fd = open(fname, O_RDONLY)) == NULL) { perror( "Cannot open file for reading" ); close( s ); return "failed"; } //attempt to allocate reception buffer buf = (char *)calloc( MAX_MSG + 1, 1 ); if( buf == NULL ) { perror( "out of memory" ); close( fd ); close( s ); return "failed"; } //while we still have message to send while((in = read(fd, buf, MAX_MSG)) > 0) { //close previous socket connection to force a flush close( s ); //allocate a socket s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); if(s < 0) { perror("error creating socket: "); return "socket creation failed."; } //connect the socket status = connect(s, (struct sockaddr *)&addr,sizeof(addr)); for(count = 0; status != 0 && count < MAX_ATTEMPTS;) { perror("retrying connection: "); if(!(errno == EBUSY || errno == EHOSTDOWN)) { close(s); s = socket(AF_BLUETOOTH,SOCK_STREAM, BTPROTO_RFCOMM); if(s < 0) { perror("error creatingsocket: "); return "socket creation failed."; } count++; sleep( 1 ); } status = connect(s, (struct sockaddr*)&addr, sizeof(addr)); } if( status < 0 ) { perror("message failed: "); close(s); close(fd); fprintf(stderr, "failed connecting, Itried %d times.\n", count); return "uh oh, that message did not go through"; } //write the next message segment fprintf(stderr,"data read '%s'\n", buf); count = write(s, buf, MAX_MSG); fprintf(stderr,"contents of in: %d, %d byteswere written\n", in, count); } } else if(status < 0) { perror("message failed: "); close(s); close(fd); fprintf(stderr, "failed connecting, I tried %d times.\n", count); return "uh oh, that message did not go through"; } fprintf(stderr, "message sent\n"); close(s); close(fd); return strdup("Success");}This is the latest iteration where the connection is stopped aftereach 4 byte transmission and restarted before the next.-------------------------------------------------------Using Tomcat but need to do more? Need to support web services, security?Get stuff done quickly with pre-integrated technology to make your job easierDownload IBM WebSphere Application Server v.1.0.1 based on Apache Geronimohttp://sel.as-us.falkag.net/sel?cmd=lnk&kid0709&bid&3057&dat1642Re: Programming in C with Bluetooth Sockets
This is the function run by the bluetooth device that will recieve the data.char* BT_Target(){ int s, client, bytes_read, count = 0; char * buf; struct sockaddr_rc loc_addr = { 0 }, rem_addr = { 0 }; int opt = sizeof(rem_addr); unsigned int max_count; //attempt to allocate reception buffer buf = (char *)calloc(MAX_MSG, 1); if(buf == NULL) { perror("No memory!"); return("No memory!"); } //attempt to allocate socket s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); if(s < 0) { perror("socket failed to open:"); return("socket failed to open"); } loc_addr.rc_family = AF_BLUETOOTH; loc_addr.rc_bdaddr = *BDADDR_ANY; loc_addr.rc_channel = (uint8_t) RFCOMM_CHANNEL; //attempt to bind the socket for a maximum number of attempts for( count = 0; count < MAX_ATTEMPTS && bind(s, (struct sockaddr*)&loc_addr, sizeof(loc_addr)) < 0; count++); //if we tried to open the socket but failed if( count == MAX_ATTEMPTS ) { perror("unable to bind socket: "); close(s); free(buf); return "unable to bind socket"; } //attempt to listen if(listen(s, 1) < 0) { perror("listen failed: "); close(s); free(buf); return "listen failed."; } //attempt to accept the socket rem_addr.rc_family = AF_BLUETOOTH; rem_addr.rc_bdaddr = *BDADDR_ANY; rem_addr.rc_channel = (uint8_t) RFCOMM_CHANNEL; client = accept(s, (struct sockaddr *)&rem_addr, &opt); //if we have created a connection //we need to recieve the transmission length into max_count if(client >= 0) { count = 0; fprintf(stderr,"Got a connection\n"); read(client, &max_count, sizeof(unsigned int)); printf( "Message size: %d\n", max_count ); close( client ); } //the accept has failed else { perror("accept failed: "); close(s); free(buf); return("accept failed"); } //while we have not recieved the entire message, get the next part while( count < max_count && ( client = accept(s, (struct sockaddr*)&rem_addr, &opt) ) >= 0 ) { bytes_read = read(client, buf + count, sizeof(buf) - count); fprintf(stderr, "got %d bytes this time\n", bytes_read); count += bytes_read; fprintf(stderr, "recieved %d [%s] so far\n", count, buf); close( client ); if(bytes_read < 0) { perror("socket issue."); fprintf(stderr, "We have socket problems.\n"); close(s); free(buf); close(client); return("We have socket Problems."); } } close(s); close(client); return "Success";}And this is the function that will send the data.char* BT_Source(char* fname, int iter, char* tMAC){ struct sockaddr_rc addr = { 0 }; int s, status, count = 0, fd; char* dest = tMAC; struct stat *stats; unsigned int len = 0; char* buf; //attempt to allocate a socket s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); if(s < 0) { perror("error creating socket: "); return "socket creation failed."; } // set the connection parameters (who to connect to) addr.rc_family = AF_BLUETOOTH; addr.rc_channel = (uint8_t) RFCOMM_CHANNEL; fprintf(stderr, "The dest addr is now %s\n", dest); str2ba(dest, &addr.rc_bdaddr); //attempt to connect the socket for our maximum number of times status = connect(s, (struct sockaddr *)&addr, sizeof(addr)); for(count = 0; status != 0 && count < MAX_ATTEMPTS;) { perror("retrying connection: "); //if the socket is busy or the host is down, close and reopen if(!(errno == EBUSY || errno == EHOSTDOWN)) { close(s); s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); if(s < 0) { perror("error creating socket: "); return "socket creation failed."; } count++; } status = connect(s, (struct sockaddr *)&addr, sizeof(addr)); } //if the socket was opened properly, send a message if(status == 0) { count = 0; //get the file size and send it to the client stat(fname, stats); len = stats->st_size; fprintf(stderr, "The length in bytes is %d\n", len); write(s, &len, sizeof(unsigned int)); //open the file if((fd = open(fname, O_RDONLY)) == NULL) { perror( "Cannot open file for reading" ); close( s ); return "failed"; } //attempt to allocate reception buffer buf = (char *)calloc( MAX_MSG + 1, 1 ); if( buf == NULL ) { perror( "out of memory" ); close( fd ); close( s ); return "failed"; } //while we still have message to send while((in = read(fd, buf, MAX_MSG)) > 0) { //close previous socket connection to force a flush close( s ); //allocate a socket s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); if(s < 0) { perror("error creating socket: "); return "socket creation failed."; } //connect the socket status = connect(s, (struct sockaddr *)&addr,sizeof(addr)); for(count = 0; status != 0 && count < MAX_ATTEMPTS;) { perror("retrying connection: "); if(!(errno == EBUSY || errno == EHOSTDOWN)) { close(s); s = socket(AF_BLUETOOTH,SOCK_STREAM, BTPROTO_RFCOMM); if(s < 0) { perror("error creatingsocket: "); return "socket creation failed."; } count++; sleep( 1 ); } status = connect(s, (struct sockaddr*)&addr, sizeof(addr)); } if( status < 0 ) { perror("message failed: "); close(s); close(fd); fprintf(stderr, "failed connecting, Itried %d times.\n", count); return "uh oh, that message did not go through"; } //write the next message segment fprintf(stderr,"data read '%s'\n", buf); count = write(s, buf, MAX_MSG); fprintf(stderr,"contents of in: %d, %d byteswere written\n", in, count); } } else if(status < 0) { perror("message failed: "); close(s); close(fd); fprintf(stderr, "failed connecting, I tried %d times.\n", count); return "uh oh, that message did not go through"; } fprintf(stderr, "message sent\n"); close(s); close(fd); return strdup("Success");}This is the latest iteration where the connection is stopped aftereach 4 byte transmission and restarted before the next.-------------------------------------------------------Using Tomcat but need to do more? Need to support web services, security?Get stuff done quickly with pre-integrated technology to make your job easierDownload IBM WebSphere Application Server v.1.0.1 based on Apache Geronimohttp://sel.as-us.falkag.net/sel?cmd=lnk&kid0709&bid&3057&dat1642 0 0
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