Install ChirpStack

Install required packages for ChirpStack (MQTT broker and Redis):

sudo apt install \
    mosquitto \
    mosquitto-clients \
    redis-server \
    redis-tools

Install the GPG tool for verifying package signatures:
```
sudo apt install gpg
```
Create the directory for APT keyrings if it doesn't exist:
```
sudo mkdir -p /etc/apt/keyrings/
```

Download and add the ChirpStack repository GPG key:

sudo sh -c 'wget -q -O - https://artifacts.chirpstack.io/packages/chirpstack.key | gpg --dearmor > /etc/apt/keyrings/chirpstack.gpg'

Add the ChirpStack repository to the APT sources list:

echo "deb [signed-by=/etc/apt/keyrings/chirpstack.gpg] https://artifacts.chirpstack.io/packages/4.x/deb stable main" | sudo tee /etc/apt/sources.list.d/chirpstack.list

Update the package list and install the ChirpStack package (SQLite variant):
```
sudo apt update
sudo apt install chirpstack-sqlite
```

Create the /var/lib/chirpstack directory and the SQLite database file with proper ownership:

sudo mkdir -p /var/lib/chirpstack
sudo chown chirpstack:chirpstack /var/lib/chirpstack
sudo chmod 0750 /var/lib/chirpstack
sudo install -o chirpstack -g chirpstack -m 0640 /dev/null /var/lib/chirpstack/chirpstack.sqlite

Write the ChirpStack configuration file:

cat << 'EOF' | sudo tee /etc/chirpstack/chirpstack.toml > /dev/null
[logging]
  level = "info"

[sqlite]
  path="sqlite:///var/lib/chirpstack/chirpstack.sqlite"
  pragmas=[
    "busy_timeout = 1000",
    "foreign_keys = ON",
  ]

[redis]
  servers = ["redis://localhost/"]
  cluster = false

[network]
  net_id = "000000"
  enabled_regions = [
    "as923",
    "as923_2",
    "as923_3",
    "as923_4",
    "au915_0",
    "cn470_10",
    "cn779",
    "eu433",
    "eu868",
    "in865",
    "ism2400",
    "kr920",
    "ru864",
    "us915_0",
    "us915_1",
  ]

[api]
  bind = "0.0.0.0:8080"
  secret = "you-must-replace-this"

[integration]
  enabled = ["mqtt"]

  [integration.mqtt]
    server = "tcp://localhost:1883/"
    json = true
EOF

Generate and set a random secret key in the ChirpStack configuration:

sudo chown chirpstack:chirpstack /etc/chirpstack/chirpstack.toml
sudo chmod 0640 /etc/chirpstack/chirpstack.toml
sudo sed -i "s|secret = \"you-must-replace-this\"|secret = \"$(openssl rand -base64 32)\"|" /etc/chirpstack/chirpstack.toml

Enable and start the ChirpStack service:

sudo systemctl enable --now chirpstack-sqlite

Check the service logs to verify successful startup:
```
sudo journalctl -fu chirpstack-sqlite
```
Now, you can access ChirpStack at this address: http://[TARGET IP ADDRESS]:8080/

danger
The default login is admin / admin. Change this password before exposing the device on any shared network.