Fix the RaspberryPi ip
sudo apt install dhcpcd5
sudo vim /etc/dhcpcd.conf
# Add the following lines at the end
interface wlan0 # or eth0
static ip_address=x.x.x.x/24 # 想改成的ip地址
static routers=x.x.x.x # 無線基地台地址
static domain_name_servers=x.x.x.x # 無線基地台地址