# Toolchain
Embassy requires Rust nightly, often with a specific version.
[`rust-toolchain.toml`](rust-toolchain.toml) records a known-good version.
# Demos
[`demos/`](demos/) has some examples. These are separate crates since they have fairly distinct dependencies.
## `picow`
Running on a Raspberry Pi Pico W.
Requires a capacitor soldered between a GPIO pin and gnd, 0.1 to 1 nF is suitable, this example uses GPIO Pin 10.
This is used for random number generation - it is somewhat experimental and should have more analysis
of the RNG quality before use in real applications.
## `std`
Running on the host system, useful for development and debugging.
The network stack is smoltcp with a `tap` device. Based on Embassy's `examples/std/src/tuntap.rs`, it needs
local network setup something like this, where a local dhcp server is running on tap0. Alternatively tap0
can be bridged to another network which has dhcp available.
```sh
sudo ip tuntap add name tap0 mode tap user $USER
sudo ip link set tap0 up
sudo ip addr add 10.9.0.1/16 dev tap0
# or
sudo brctl addif br0 tap0
```