I have a Raspberry Pi 3 here. It is setup to use my home network. Unfortunately I am not at home and I don’t have access to a tv that has hdmi. Normally I ssh in from my laptop but I can’t do that as I can’t see it on the network. I have the sd card in a reader and found my home network settings in preseed.cfg. Now that sounds like something that only runs when you first start the device. Is my assumption correct?
Now I could just copy off the config.txt, format it and copy back the config.txt. But I would have to reinstall a half dozen apps I have on there which will be a pain. With only my sdcard reader and a text editor can I add another network so I can use it whether I am here or at home and not have to worry (like I can with my phones, tablet, and laptop)?
I found one other topic that covers this via SSH (I need to get on the network first) and apparently “isn’t trivial” but doesn’t expand. The OP in that thread was going to mess around with the router which I have access to but rather I wouldn’t.