一段时间后，WiFi在Raspberry Pi上断开连接，不会重新连接

我终于可以使用以下设置（不使用wpa_supplicant.conf）将Raspberry Pi连接到隐藏的SSID网络（WPA2 Personal）。

但是，几个小时后，它会断开连接并且不会重新连接。

• Raspberry Pi B +，运行NOOBS。
• USB供电的WiFi卡（Ralink RT5370芯片组）
• 已连接至隐藏的SSID（我不确定此隐藏的SSID与该问题有关，可能是红色鲱鱼）

这是日志：

Feb  6 14:36:01 raspberrypi wpa_supplicant[1641]: wlan0: CTRL-EVENT-DISCONNECTED bssid=90:72:40:1c:ed:c8 reason=4
Feb  6 14:36:01 raspberrypi kernel: [33883.785257] cfg80211: Calling CRDA to update world regulatory domain
Feb  6 14:36:01 raspberrypi ifplugd(wlan0)[1634]: Link beat lost.
Feb  6 14:36:11 raspberrypi ifplugd(wlan0)[1634]: Executing '/etc/ifplugd/ifplugd.action wlan0 down'.
Feb  6 14:36:11 raspberrypi dhclient: Internet Systems Consortium DHCP Client 4.2.2
Feb  6 14:36:11 raspberrypi ifplugd(wlan0)[1634]: client: Internet Systems Consortium DHCP Client 4.2.2
Feb  6 14:36:11 raspberrypi dhclient: Copyright 2004-2011 Internet Systems Consortium.
Feb  6 14:36:11 raspberrypi ifplugd(wlan0)[1634]: client: Copyright 2004-2011 Internet Systems Consortium.
Feb  6 14:36:11 raspberrypi dhclient: All rights reserved.
Feb  6 14:36:11 raspberrypi ifplugd(wlan0)[1634]: client: All rights reserved.
Feb  6 14:36:11 raspberrypi dhclient: For info, please visit https://www.isc.org/software/dhcp/
Feb  6 14:36:11 raspberrypi ifplugd(wlan0)[1634]: client: For info, please visit https://www.isc.org/software/dhcp/
Feb  6 14:36:11 raspberrypi dhclient: 
Feb  6 14:36:11 raspberrypi dhclient: Listening on LPF/wlan0/00:0f:60:01:de:14
Feb  6 14:36:11 raspberrypi ifplugd(wlan0)[1634]: client: Listening on LPF/wlan0/00:0f:60:01:de:14
Feb  6 14:36:11 raspberrypi dhclient: Sending on   LPF/wlan0/00:0f:60:01:de:14
Feb  6 14:36:11 raspberrypi ifplugd(wlan0)[1634]: client: Sending on   LPF/wlan0/00:0f:60:01:de:14
Feb  6 14:36:11 raspberrypi dhclient: Sending on   Socket/fallback
Feb  6 14:36:11 raspberrypi ifplugd(wlan0)[1634]: client: Sending on   Socket/fallback
Feb  6 14:36:11 raspberrypi dhclient: DHCPRELEASE on wlan0 to 192.168.128.254 port 67
Feb  6 14:36:11 raspberrypi ifplugd(wlan0)[1634]: client: DHCPRELEASE on wlan0 to 192.168.128.254 port 67
Feb  6 14:36:12 raspberrypi wpa_supplicant[1641]: wlan0: CTRL-EVENT-TERMINATING - signal 15 received
Feb  6 14:36:12 raspberrypi ifplugd(wlan0)[1634]: Program executed successfully.
Feb  6 14:36:14 raspberrypi ntpd[2157]: Deleting interface #2 wlan0, 192.168.128.122#123, interface stats: received=389, sent=396, dropped=0, active_time=33841 secs
Feb  6 14:36:14 raspberrypi ntpd[2157]: 192.96.207.244 interface 192.168.128.122 -> (none)
Feb  6 14:36:14 raspberrypi ntpd[2157]: 178.18.16.124 interface 192.168.128.122 -> (none)
Feb  6 14:36:14 raspberrypi ntpd[2157]: 204.2.134.164 interface 192.168.128.122 -> (none)
Feb  6 14:36:14 raspberrypi ntpd[2157]: 216.152.240.220 interface 192.168.128.122 -> (none)
Feb  6 14:36:14 raspberrypi ntpd[2157]: peers refreshed

这是/ etc / network / interfaces

auto lo
iface lo inet loopback
iface eth0 inet dhcp
auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
    wpa-scan-ssid 1
    wpa-ap-scan 1
    wpa-key-mgmt WPA-PSK
    wpa-proto RSN WPA
    wpa-pairwise CCMP TKIP
    wpa-group CCMP TKIP
    wpa-ssid "Na*****"
    wpa-psk *********************************************************

我能够解决此问题的唯一方法是编写由cron作业每分钟运行一次的shell脚本。它检查网络是否断开，如果是，则重新连接。在过去的一周里，它运行得非常好。

#!/bin/bash

MY_PATH="`dirname \"$0\"`"              # relative
LOG_PATH="`( cd \"$MY_PATH\" && cd .. && pwd )`/log/network.log"
now=$(date +"%m-%d %r")

# Which Interface do you want to check
wlan='wlan0'
# Which address do you want to ping to see if you can connect
pingip='google.com'

# Perform the network check and reset if necessary
/bin/ping -c 2 -I $wlan $pingip > /dev/null 2> /dev/null
if [ $? -ge 1 ] ; then
    echo "$now Network is DOWN. Perform a reset" >> $LOG_PATH
    /sbin/ifdown $wlan
    sleep 5
    /sbin/ifup --force $wlan
else
    echo "$now Network is UP. Just exit the program." >> $LOG_PATH
fi

这是预期的行为；无法保证100％的时间提供WiFi。

这适用于2015年5月5日之前的Raspbian Wheezy（以及后来的Jessie），请参阅如何设置网络/ WiFi /静态IP。

如果您希望它在失去连接后自动重新连接wpa-roam，请与wpa_supplicant.conf)

PS发布您的SSID和PSK是不明智的

/ etc / network / interfaces

auto lo

iface lo inet loopback
iface eth0 inet dhcp

allow-hotplug wlan0
auto wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf

iface home inet dhcp
iface default inet dhcp

/etc/wpa_supplicant/wpa_supplicant.conf

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    scan_ssid=1
    ssid="xxx"
    psk="yyy"
    id_str="home"
    proto=RSN
    key_mgmt=WPA-PSK
    pairwise=CCMP
    auth_alg=OPEN
    eap=MD5
}

按照建议，您可以使用wpa-roam，尽管我建议使用wicd或网络管理器。他们负责所有设置，还处理多个网络，并且更加用户友好。

例如，wicd有一个curses gui可以安装：

sudo apt-get install wicd-curses

并运行：

wicd-curses

断开连接存在相同的问题...与无线适配器有关。我的linksys ae3000每隔几天就会断开连接。我对其进行了少许修改，使其可以与运动USB摄像机和nfs共享一起使用，并添加了电子邮件通知。

Crontab条目：

*/1 * * * * /root/netcheck.sh > /dev/null 2>&1

修改后的脚本：

#!/bin/bash

LOG_PATH="/var/log/network.log"
now=$(date +"%m-%d %r")

# Which Interface do you want to check (wlan = wireless, eth0 = ethernet)
iface='eth0'
# Which address do you want to ping to see if you can connect
pingip='google.com'

# Perform the network check and reset if necessary
/bin/ping -c 2 -I $iface $pingip > /dev/null 2> /dev/null
if [ $? -ge 1 ] ; then
    echo "$now Network is DOWN. Perform a reset" >> $LOG_PATH
    /sbin/ifdown $iface
    sleep 5
    /sbin/ifup --force $iface
    sleep 5
    /bin/mount -o remount /data (reconnects my NAS nfs share)
    sleep 2
    /etc/init.d/motion restart  (restarts motion to clean hung processes)
    sleep 3
    /etc/init.d/motion restart  (2nd restart for sanity sake, sometimes 1st restart doesn't pan out)
    mail -s "`hostname` $iface recovered" xxxxxxxxx@gmail.com < /dev/null  (send me an email so I know about this)
fi

我更改了时间设置，一切都开始为我工作。

首选项-> Raspberry Pi配置->本地化选项卡

我确保为我的位置正确设置了所有4个选项。

禁用wifi电源管理应该会有所帮助，如下所述：https : //discourse.osmc.tv/t/pi-3-wifi-unstable/14171/25

遇到相同的问题，请每分钟让我的Google Ping Ping一次，以解决此问题。

跑 sudo crontab -e

将此添加到文件末尾

* * * * * /bin/ping -c2 -I wlan0 8.8.8.8 >/dev/null