I'm trying to set up a new micro sd boot card. I've got the img on the card (can be re-written if necessary), but I want to set up the wifi before I even boot the pi. My understanding is that I edit the supplicant.conf file to add the network key. This is unfortunate, because I can not for the life of me figure out how to do it.My best guess at this point is to extract the img, change the file, and then repack it. Is there a utility that can correctly unpack a linux img, and is there a utility that can correctly put together a linux img?.
MotivationWhen I first started my RasPi clustering adventure, I found a ton of blog posts talking about automating the later stages of cluster management and I found several discussing GUI tools and other heavy and/or manual methods of setting up sdcards for the Pis in the first place. As someone who prides myself both on being lazy and on avoiding untrusted links in the chain, I wanted to avoid specialty pre-built images as well as anything involving steps like:. “click on the blocks to bake an image for each node”. “watch on your router to get the IPs as your nodes come online”. “plug each Pi in individually, then run $x before plugging in the next one”.I also did not want to start this project with Ansible as it seems like a lot of cognitive overhead just to provision a few machines. This left me creating a that do what I need with no uncommon dependencies. Why is SD card setup so hard?While things have gotten a lot better with headless RasPi setup over the last few years, it still requires a bit of knowing what you’re doing.
Summary: Everything is connected, and appears to work, but no sound comes out of the speaker - how to diagnose or fix? I am trying to play sound from my Raspberry Pi 3 to a bluetooth speaker, but it is not working.