TCP-OVER-BT

Make a TCP connection from Bluetooth.

Use Case

SSH into a Linux machine, which is headless (e.g. Raspberry Pi Zero 2 W) or has a bad network configuration without using a Display Monitor.

For Device

When you have network connection:

1. Run make device to build the binary for device.
2. Put the binary into /usr/local/bin.
3. Move the .service file into /etc/systemd/system.
4. Enable: sudo systemctl daemon-reload && sudo systemctl enable tcp-over-bt.service

For Host

1. Run make host

2. Create a SSH config in ~/.ssh/config:

   Host zero
   	ProxyCommand tcp-over-bt

3. ssh zero and wait patiently, it will discover the first available device.

Note: Only one SSH connection is allowed at a time, which is a characteristic of Bluetooth connections. If you want multiple shells, use tmux.

Security

There's no Bluetooth Paring. Anyone can connect to the same device. Authentication is done by SSH.

TODO

• Flow Control: Sending is too fast, while Recv is too slow.
• Allow more than one client.