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I followed this tutorial to set up my RPi 3 as an Access Point. It works great and I am able to connect through it and I can also VNC to it directly from my phone when in my car (which was the main aim).

However, I now need to revert it back to client mode so that I can connect to it through my home network when I am back home. To be precise, I need an easy way to switch between the two modes.

I tried to follow the instructions in this post but they seem to aimed at using isc-dhcp-server rather than dnsmasq like I am doing. #systemctl stop dnsmasq.service did not appear to do anything. Besides, I am stuck at the part where it says I have to "use wpa_supplicant as a service". The link points to a text file which I have no idea how to put to use. As things stand, if I click on the up/down arrows icon at the top right of the screen, it says "no wireless interfaces found".

My first priority is to switch back to client mode. I will worry about how to automate that later (although it would be cool if there was a single tutorial for doing both using the AP setup I used).

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I referenced the following link to come up with my procedure which worked for me:

https://hydrosysblog.wordpress.com/2016/08/07/rpi3-switch-between-wifi-ap-and-client/

sudo systemctl stop hostapd.service
sudo systemctl stop isc-dhcp-service
sudo ip link set dev wlan0 down
ctrl_interface=/run/wpa_supplicant
update_config=1
sudo ip link set dev wlan0 up
sudo ifup wlan0 #not sure if this command was needed or if the one before did the trick but I included it just in case

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