如何解决树莓派 SSH 待机一段时间后自动断开 bug All In One

如何解决树莓派 SSH 待机一段时间后自动断开 bug All In One

# 等待⌛️一分钟后，不取消就立刻关机 ✅
$ sudo shutdown -H

$ ssh pi@raspberrypi.local

raspberry pi 3 close wlan power management ✅

# 查看
$ iwconfig

# Command to read the current power saving mode (Stretch)
$ sudo iw wlan0 get `power_save`

# Command to `power_save off`
$ sudo iw wlan0 set power_save off

# To make this permanent add the following line to `/etc/rc.local`

$ cat /etc/rc.local

# sudo 必须 ✅
$ sudo vim  /etc/rc.local
# add below line before exit 0 ✅
/sbin/iw dev wlan0 set power_save off

https://www.weigu.lu/sb-computer/raspi_tips_tricks/index.html#link_4

Raspberry Pi 关闭 WLAN 电池管理 / 电源管理

防止 SSH 一段时间后自动断开连接

# view power management status
$ iwconfig

# edit config
$ sudo vim /etc/rc.local
# or
$ sudo nano /etc/rc.local

# add below line code before `exit 0`
iwconfig wlan0 power off

$ sudo reboot
# or
$ sudo shutdown -r now

# check power management status, again
$ iwconfig

demo

Power Management:on

$ iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     IEEE 802.11  ESSID:"ziroom1001"  
          Mode:Managed  Frequency:2.417 GHz  Access Point: 80:12:DF:91:00:AA   
          Bit Rate=72.2 Mb/s   Tx-Power=31 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=64/70  Signal level=-46 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:29  Invalid misc:0   Missed beacon:0

solution ✅

$ iwconfig

$ cat /etc/rc.local

$ sudo reboot

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

# Print the IP address
_IP=$(hostname -I) || true
if [ "$_IP" ]; then
  printf "My IP address is %s\n" "$_IP"
fi

# 禁用电源关闭 ✅
iwconfig wlan0 power off

exit 0

https://www.youtube.com/watch?v=BqIVmKtzITo

ip.sh

#!/usr/bin/env bash

# coding: utf8

# Print the IP address
_IP=$(hostname -I) || true
if [ "$_IP" ]; then
  printf "My IP address is %s\n" "$_IP"
  printf "🌲🍓我的IP地址是 %s\n" "$_IP"
fi

exit 0

<<EOF
./ip.sh
My IP address is 192.168.18.135 fd80:eae6:1258:0:d1c5:2a7f:abad:cbb5
🌲🍓我的IP地址是 192.168.18.135 fd80:eae6:1258:0:d1c5:2a7f:abad:cbb5
EOF

关闭电源节能管理 ???

DPMS (Display Power Management Signaling)

DPMS（显示器电源管理信号）

# 修改 lightdm.conf
$ sudo vim /etc/lightdm/lightdm.conf

# 新增 一行
xserver-command=x -s 0 -dpms

# s 0 关闭屏幕保护
# -dpms 是关闭电源节能管理

https://blog.js-css.com/topics/2022/03/20/111/

https://blog.csdn.net/zhangyx22/article/details/109038699

https://pimylifeup.com/raspberry-pi-disable-screen-blanking/

同一个 WIFI 局域网无法互相 ping 通 ❌

SSH server 默认关闭了 ❓

# 显示器，开机后，在树莓派配置中将SSH开启即可。
$ sudo service ssh start

$ sudo service ssh status

# 配置自动开启 SSH ✅
$ sudo vim  /etc/rc.local

# add below line
 sudo service ssh start

raspberry pi ssh Host is down

https://raspberrypi.stackexchange.com/questions/41595/why-cant-i-ssh-to-raspbian-anymore

https://stackoverflow.com/questions/41318597/ssh-connection-refused-on-raspberry-pi

https://www.raspberrypi.com/documentation/computers/remote-access.html

solutions

1. 关闭无线网卡电源管理

bug ❌

$ ls /sys/class/net/
# eth0  lo  wlan0

$ ls /sys/class/net/wlan0/device/driver/module/drivers
# usb:rtl8192cu

# 8192cu
$ cat /sys/module/8192cu/parameters/rtw_power_mgnt
# 1 
# 1 说明你的无线网卡的电源处于管理之下，为了`省电`会在不必要的时候关闭无线网卡

# 关闭电源管理
$ sudo touch /etc/modprobe.d/8192cu.conf
# vim / vscode

# Disable power management， 设置成 0
options 8192cu rtw_power_mgnt=0

# 立即重启 树莓派
$ sudo shutdown -r now


# 检查一下是否无线电源管理已经关闭
$ cat /sys/module/8192cu/parameters/rtw_power_mgnt
# 0
# 0 已经关闭电源管理了

???

# 没有 8192cu ❌
$ ls -al /sys/module/

$ ls -al /sys/module/ | grep 8
drwxr-xr-x   5 root root 0 May 27 00:47 8021q
drwxr-xr-x   3 root root 0 May 27 00:47 8250
drwxr-xr-x   3 root root 0 May 27 00:47 bcm2708_fb
drwxr-xr-x   7 root root 0 May 27 00:47 bcm2835_codec
drwxr-xr-x   7 root root 0 May 27 00:47 bcm2835_isp
drwxr-xr-x   6 root root 0 May 27 00:47 bcm2835_mmal_vchiq
drwxr-xr-x   3 root root 0 May 27 00:47 bcm2835_mmc
drwxr-xr-x   7 root root 0 May 27 00:47 bcm2835_v4l2
drwxr-xr-x   6 root root 0 May 27 00:47 cfg80211
drwxr-xr-x   7 root root 0 May 27 00:47 i2c_bcm2835
drwxr-xr-x   4 root root 0 May 27 00:47 lan78xx
drwxr-xr-x   3 root root 0 May 27 00:47 r8152
drwxr-xr-x   7 root root 0 May 27 00:47 snd_bcm2835

$ ls -al /sys/module/8250/parameters/

$ ls -al /sys/module/8021q

树莓派3 关闭电源管理

✅ ???

# 查看 电源管理 状态
$ iwconfig

$ cat /etc/network/interfaces

$ vim /etc/network/interfaces

# 目标wlan里加一句
wireless-power off


# 重启
$ sudo reboot
# 或
$ sudo shutdown -r now

https://myblog.galaxymaxmetal.xyz/archives/64

https://www.cnblogs.com/cloudrivers/p/11496408.html

❌

https://gist.github.com/hofmannsven/9132419?permalink_comment_id=3159275#disable-power-management
https://www.raspberrypi-spy.co.uk/2015/06/how-to-disable-wifi-power-saving-on-the-raspberry-pi/

树莓派 3 & 截屏软件

# superuser do === sudo
$sudo apt-get ???

https://shumeipai.nxez.com/2019/07/30/how-to-take-a-screenshot-on-the-raspberry-pi.html

refs

https://mitnk.github.io/2016/01/fix-raspberry-pi-2-wifi-ssh-disconnect-issue/

https://askubuntu.com/questions/96333/what-wireless-driver-am-i-using

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