add RPi and packet forwarder instructions

doc/1-raspberry-pi-setup.md

@@ -4,5 +4,34 @@ Download the [Raspberry Pi Imager](https://flathub.org/apps/org.raspberrypi.rpi-
 
 Download Raspberry Pi OS Lite 64-bit from the [Raspberry Pi download page](https://www.raspberrypi.com/software/operating-systems/)
 
-Settings in the imager
+Open the imager and do the following:
 
+- Choose custom image (at the bottom)
+  - Pick the OS file you downloaded
+- Choose your SD card for storage
+- Click the gear icon for settings
+  - Set hostname, enable SSH, set username/password, set WiFI as desired
+- Click image
+
+Once writing is done, put the SD card in and start up the Pi. Wait a minute for it to start and join the network.
+
+Find the IP address of the Pi via your router (look for DHCP leases) and SSH in.
+
+![Example pfSense DHCP Lease Page](dhcp-leases.png)
+
+Change the IP address to be static by adding the following to the bottom of `/etc/dhcpcd.conf` (modify for your own environment, using `eth0` for wired):
+
+```conf
+interface wlan0
+static ip_address=192.168.0.181
+static routers=192.168.0.1
+static domain_name_servers=192.168.0.1
+```
+
+Enable SPI in the Raspberry Pi config by editing `/boot/config.txt` and uncommenting the line `#dtparam=spi=on`.
+
+Update, upgrade, and install Git: `sudo apt update && sudo apt -y upgrade && sudo apt install -y git`.
+
+Reboot and SSH in to the new static IP you assigned.
+
+The Pi is ready for the packet forwarder to be installed.

doc/2-packet-forwarder.md

@@ -1,20 +1,29 @@
 # Packet Forwarder
 
-Download `lora_pkt_fwd` from <https://github.com/Lora-net/sx1302_hal>
+SSH to the Raspberry Pi.
 
-Run `make`
+Clone the packet forwarder repository: `git clone https://github.com/Lora-net/sx1302_hal.git`.
 
-Setup config
+Go into the repo and run `make`.
 
 Make pf user + give permissions
 
-Copy files to pf user's home:
+- `sudo useradd -m -s /usr/sbin/nologin pf`
+  - `-m`: create home
+  - `-s /usr/sbin/nologin`: don't allow logging in; the user's only purpose is to own the packet forwarder process
+  - `pf`: the username
+- `sudo usermod -aG gpio pf` (the `spi` group is not sufficient, and it is also not needed when part of the `gpio` group)
 
-- `global_conf.json.sx1250.US915`
-- `lora_pkt_fwd`
-- `reset_lgw.sh`
+From the packet forwarder repo, copy files to pf user's home and set permissions:
 
-(Make sure execute permission is set on `lora_pkt_fwd` and `reset_lgw.sh`.)
+```sh
+sudo cp packet_forwarder/{global_conf.json.sx1250.US915,lora_pkt_fwd} /home/pf
+sudo cp tools/reset_lgw.sh /home/pf
+sudo chown pf:pf /home/pf/{global_conf.json.sx1250.US915,lora_pkt_fwd,reset_lgw.sh}
+sudo chmod +x /home/pf/{lora_pkt_fwd,reset_lgw.sh}
+```
+
+Modify the packet forward config at `/home/pf/global_conf.json.sx1250.US915`. Change `gateway_ID` to something nice (????). 8 bytes (16 uppercase hex characters)
 
 Create SystemD unit file at `/etc/systemd/system/packet-forwarder.service`:
 
@@ -37,3 +46,5 @@ WantedBy=multi-user.target
 ```
 
 Start and enable `sudo systemctl enable --now packet-forwarder.service`.
+
+Check that it is running with `sudo systemctl status packet-forwarder.service`.