一、测试环境为：树莓派3B+

pi@raspberrypi:~/workfile/lorawan/lorawan-gw $ uname -a 
Linux raspberrypi 6.1.21-v7+ #1642 SMP Mon Apr 3 17:20:52 BST 2023 armv7l GNU/Linux

        测试过程中，请确保树莓派连接网络 ；

二、安装ntp相关命令，并设置时区

step 1 ：安装 ntp 和 ntpdate 命令

sudo apt install ntp sudo apt install ntpdate

step2 ：修改本地时区，输入指令 ： sudo dpkg-reconfigure tzdata

pi@raspberrypi:~ $ sudo dpkg-reconfigure tzdata

        select "Asia"

         按回车键，select "Shanghai"

        按回车健，确定即可；

step3 : 重启ntp服务器

sudo /etc/init.d/ntp restart

step4 : 自动同步时间

pi@raspberrypi:~ $ sudo systemctl status ntp.service
● ntp.service - Network Time Service
     Loaded: loaded (/lib/systemd/system/ntp.service; enabled; vendor preset: enabled)
     Active: active (running) since Tue 2023-08-22 20:14:59 CST; 1min 12s ago
       Docs: man:ntpd(8)
    Process: 1778 ExecStart=/usr/lib/ntp/ntp-systemd-wrapper (code=exited, status=0/SUCCESS)
   Main PID: 1784 (ntpd)
      Tasks: 2 (limit: 1595)
        CPU: 128ms
     CGroup: /system.slice/ntp.service
             └─1784 /usr/sbin/ntpd -p /var/run/ntpd.pid -g -u 117:125

Aug 22 20:14:59 raspberrypi systemd[1]: Started Network Time Service.
Aug 22 20:15:00 raspberrypi ntpd[1784]: Soliciting pool server 193.182.111.143
Aug 22 20:15:01 raspberrypi ntpd[1784]: Soliciting pool server 84.16.67.12
Aug 22 20:15:01 raspberrypi ntpd[1784]: Soliciting pool server 94.237.64.20
Aug 22 20:15:02 raspberrypi ntpd[1784]: Soliciting pool server 79.133.44.136
Aug 22 20:15:02 raspberrypi ntpd[1784]: Soliciting pool server 79.133.44.136
Aug 22 20:15:03 raspberrypi ntpd[1784]: Soliciting pool server 36.110.233.85
Aug 22 20:15:03 raspberrypi ntpd[1784]: Soliciting pool server 202.112.29.82
Aug 22 20:15:04 raspberrypi ntpd[1784]: Soliciting pool server 119.28.183.184
Aug 22 20:15:05 raspberrypi ntpd[1784]: Soliciting pool server 185.209.85.222

三、其他

        参考过很多的文章，提及到以下命令：

sudo timedatectl set-ntp true

        实际测试，在执行以上命令时会出现如下异常

pi@raspberrypi:~/workfile $ sudo sudo timedatectl set-ntp true 
Failed to set ntp: NTP not supported pi@raspberrypi:~/workfile $

        在设置过程中，暂忽略使用该命令；