树莓派连接蓝牙适配器，与手机通过蓝牙进行通信

• #include <stdio.h>
  
• #include <unistd.h>
• #include <sys/socket.h>
• #include <bluetooth/bluetooth.h>
• #include <bluetooth/rfcomm.h>
• int main(int argc, char **argv)
• {
•     struct sockaddr_rc addr = { 0 };
•     int s, status, len=0;
•     char dest[18 = "00:12:01:31:01:13";
•     char buf[256;
•     // allocate a socket
•     s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
•     // set the connection parameters (who to connect to)
•     addr.rc_family = AF_BLUETOOTH;
•     addr.rc_channel = (uint8_t) 1;
•     str2ba( dest, &addr.rc_bdaddr );
•     // connect to server
•     status = connect(s, (struct sockaddr *)&addr, sizeof(addr));
•     if(status){
•         printf(" failed to connect the device!\n");
•         return -1;
•     }
•     do{
•         len = read(s, buf, sizeof buf);
•      if( len>0 ) {
•          buf[len=0;
•          printf("%s\n",buf);
•          write(s, buf, strlen(buf));
•      }
•     }while(len>0);
•     close(s);
•     return 0;
• }
• 现在树莓派与手机已经连接，但无法读取到手机发送的信息，树莓派上的连接选的是Serial Port