# PiFi

This is a simple tool to create and manage a hotspot with NetworkManager through DBUS.  
The code is based on https://github.com/NetworkManager/NetworkManager/blob/main/examples/python/dbus/wifi-hotspot.py, rewritten in Go and adds following features:

- Environment variables or intput parameters for SSID and password
- Option to remove the connection

## Build

```bash
make build ARCH=arm64
```

## Usage

```bash
# sudo ./pifi <ifname> [up|down|remove] [ssid] [password]
sudo ./pifi wlan0 up "My Hotspot" "my password"
sudo ./pifi wlan0 down
sudo ./pifi wlan0 remove
```

## Environment variables

The hotspot will use the environment variables `WIFI_SSID` and `WIFI_PASSWORD` if they are set.

```bash
export WIFI_SSID="My Hotspot"
export WIFI_PASSWORD="my password"

sudo -E ./pifi wlan0 up
```

## Troubleshooting

### No internet access

If a client is connected to the hotspot and the RaspberryPI is connected to the internet via ethernet but no internet access is available for the client, try to enable IPv4 forwarding in `/etc/sysctl.conf`, reload the configuration and restart NetworkManager.

```bash
sudo sysctl -w net.ipv4.ip_forward=1
sudo sysctl -p /etc/sysctl.conf
sudo systemctl restart NetworkManager
```