BLE on raspberry pi整理

http://www.arthurtoday.com/2014/12/raspberry-pi-install-bluez-5-with-ble-support.html

sudo apt-get install libusb-dev

sudo apt-get install libdbus-1-dev

sudo apt-get install libglib2.0-dev --fix-missing

sudo apt-get install libudev-dev

sudo apt-get install libical-dev

sudo apt-get install libreadline-dev

wget https://www.kernel.org/pub/linux/bluetooth/bluez-5.18.tar.xz
(建議使用5.18版)

sudo tar xvf bluez-5.18.tar

cd bluez-5.18

sudo ./configure --disable-systemd

sudo make (下完這個指令後，就可以先去做別的事了，因為，要跑一段時間哩 ! )

sudo make install

sudo reboot

sudo hciconfig hci0 up

sudo hcitool lescan

sudo hcitool lecc  99:99:99:99:99:99(在openwrt底下不需要這段)

cp attrib/gatttool /usr/local/bin/

gatttool -b 12:34:56:78:15:21 -I

char-read-hnd 0x001c
char-write-req 0x001c 01

0x001C: PIO
0x0020:battery level


gatttool -b 12:34:56:78:15:21 --char-read -a 0x001c
gatttool -b 12:34:56:78:15:21 --char-write-req -a 0x001c -n 00

3 pio: gatttool -b 12:34:56:78:15:21 --char-read -a 0x001c
pio 1: gatttool -b 12:34:56:78:15:21 --char-read -a 0x001f
pio 2: gatttool -b 12:34:56:78:15:21 --char-read -a 0x0022
pio 3: gatttool -b 12:34:56:78:15:21 --char-read -a 0x0025

battery: gatttool -b 12:34:56:78:15:21 --char-read -a 0x0029

ble on QT
http://doc.qt.io/qt-5/qtbluetooth-le-overview.html


iptables -F
iptables -A INPUT -i eth0 -p tcp --dport 5000 -j ACCEPT

C 面試題目

String copy

char* gstrcpy(char* dstr, char* sstr){

    if (dstr == NULL) return NULL;
    if (sstr == NULL) return NULL;

    char* temp = dstr;
    while(*dstr++ = *sstr++);
    return temp;
}

String cat

char* gstrcat(char* dstr, char* sstr){

    if (dstr == NULL) return NULL;
    if (sstr == NULL) return NULL;

    char* temp = dstr;
    dstr = dstr+sizeof(dstr);
    while(*dstr++ = *sstr++);
    return temp;
}