I configured my Raspi (3B+, Raspbian Stretch) as a WLAN Access Point, as described here: https://www.raspberrypi.org/documentation/configuration/wireless/access-point.md
Now I want to switch my Raspi back to a normal WLAN configuration where it connects to a WLAN where I provide SSID + PSK - but it seems I somewhere got lost between configuration of access point mode and other configuration steps.
What is the minimum set of services to shut down, to make it a normal WLAN client again? I don't want to uninstall anything, but disable configurations in the end via shell scripts. Goal is that I can easily switch between AccessPoint mode and Client of a stationary WLAN. Note that AdHocWifi is no option for me; Android Clients must be able to connect while in AccessPoint mode.
I did already configure network/interfaces to disable "static" mode, and and also tried to disable config in but id did not work.
Then I tried, according to Switch between AP and client mode, to stop the unneeded services and start wpa_supplicant:
xxx@coneCube:~ $ sudo service hostapd stop
xxx@coneCube:~ $ sudo service udhcpd stop
xxx@coneCube:~ $ sudo service wpa_supplicant start
xxx@coneCube:~ $ ifconfig
[...]
wlan0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether b8:27:eb:5c:7f:f7 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 72 bytes 14234 (13.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
xxx@coneCube:~ $ sudo ifdown wlan0
Killed old client process
Internet Systems Consortium DHCP Client 4.3.5
Copyright 2004-2016 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/wlan0/b8:27:eb:5c:7f:f7
Sending on LPF/wlan0/b8:27:eb:5c:7f:f7
Sending on Socket/fallback
xxx@coneCube:~ $ sudo ifup wlan0
Internet Systems Consortium DHCP Client 4.3.5
Copyright 2004-2016 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/wlan0/b8:27:eb:5c:7f:f7
Sending on LPF/wlan0/b8:27:eb:5c:7f:f7
Sending on Socket/fallback
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 5
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7
As you see, it doesn't get a connection to the DHCP of the WLAN.
My /etc/network/interfaces.d/wlan0 configuration:
auto wlan0
allow-hotplug wlan0
#WLAN-AP BEGIN
#iface wlan0 inet static
# address 192.168.5.1
# netmask 255.255.255.0
# post-up route add default gw 192.168.5.1
# pre-down route del default gw 192.168.5.1
##wireless-essid coneCube34f214a0
##wireless-channel 1
#WLAN-AP END
#WLAN-CONNECTED BEGIN
iface wlan0 inet dhcp
wpa-ssid "MyWlanSSID"
wpa-psk "MyHighlyConfidentalPSK"
#WLAN-CONNECTED END
When I enter a wrong key for the psk (typo: woa-psk instead of wpa-psk) I didn't get ANY error that the config was wrong!
My dhcpcd.conf is fully commented-out because no local DHCP server in use when using wpa_supplicant (this is at least the goal)
Currently running services (overview):
xxx@coneCube:~ $ sudo service --status-all
[ - ] alsa-utils
[ + ] avahi-daemon
[ + ] bluetooth
[ - ] console-setup.sh
[ + ] cron
[ + ] dbus
[ + ] dhcpcd
[ + ] dnsmasq
[ + ] dphys-swapfile
[ + ] fake-hwclock
[ - ] hostapd
[ - ] hwclock.sh
[ - ] keyboard-setup.sh
[ + ] kmod
[ - ] networking
[ - ] nfs-common
[ - ] paxctld
[ - ] plymouth
[ - ] plymouth-log
[ + ] procps
[ + ] raspi-config
[ - ] rpcbind
[ - ] rsync
[ + ] rsyslog
[ + ] ssh
[ - ] sudo
[ + ] triggerhappy
[ + ] udev
[ - ] udhcpd
[ - ] x11-common
