Pi has serial pins; you only need one USB-serial adapter, connected to the right gpio pins on the pi. This is pretty reliable, and should work even with a pretty wide range of failure modes.
It’s less flexible than a network connection—pretty much text console only, no file transfers or other protocols. You might also want to set up the pi to boot as an access point for an ad-hoc Wi-Fi network, so you can connect to it over Wi-Fi even out in the woods with no “real” network available. I used to have my travel/tool pi with both a Wi-Fi dongle and the built-in Wi-Fi configured to do this simultaneously with regular Wi-Fi client access.
Pi has serial pins; you only need one USB-serial adapter, connected to the right gpio pins on the pi. This is pretty reliable, and should work even with a pretty wide range of failure modes.
It’s less flexible than a network connection—pretty much text console only, no file transfers or other protocols. You might also want to set up the pi to boot as an access point for an ad-hoc Wi-Fi network, so you can connect to it over Wi-Fi even out in the woods with no “real” network available. I used to have my travel/tool pi with both a Wi-Fi dongle and the built-in Wi-Fi configured to do this simultaneously with regular Wi-Fi client access.