# qft
QFT is a small command line application for Quick Peer-To-Peer UDP file transfer.

## Usage:
- Find a public QFT helper (for example tudbut.de:4277)
- On the sender PC, enter `qft sender <helper> <shared-phrase> <filename>`.
- On the receiver PC, enter `qft receiver <helper> <shared-phrase> <filename>`.
- Both PCs should start transferring after a short while. If they don't, try again.

## Tips 'n Tricks
- You can add a number to the end of both of your commands (after the filename) to
  boost transfer speeds (higher = faster), but a too large number might cause unreliability
  due to local network conditions or VPNs.
- To use qfts and qftr aliases on linux or mac, run:
```sh
echo 'alias qftr="qft receiver tudbut.de:4277"' >> ~/.(shell)rc
echo 'alias qfts="qft sender tudbut.de:4277"' >> ~/.(shell)rc
```

## Troubleshooting

### It constantly says `CONNECTING`
One of your ends didn't correctly connect to the helper. Stop the transfer on both ends
and try again. If it still doesn't work, make SURE the time and date on both ends are within an
error of <0.1 seconds! Holepunching strongly relies on the time and date matching. (If you have any
suggestion on how I can mitigate this reliance on time, please open an issue!)