Defines a behaviour for connecting to a peripheral.

This behaviour is used by all the driver types in Wafer and you should implement it for your devices also.

Example

Implementing Conn for a HTS221 chip connected via Circuits' I2C driver.

defmodule HTS221 do
  defstruct ~w[conn]a
  alias Wafer.Driver.Circuits.I2C, as: Driver
  @behaviour Wafer.Conn
  @default_bus "i2c-1"
  @default_address 0x5F

  def acquire(opts) when is_list(opts) do
    bus = Keyword.get(opts, :bus, @default_bus)
    address = Keyword.get(opts, :address, @default_address)
    with {:ok, conn} <- Driver.acquire(bus_name: bus, address: address),
        do: {:ok, %HTS221{conn: conn}}
  end
end