# `MqttX.Client.Backoff`
[🔗](https://github.com/cignosystems/mqttx/blob/v0.10.0/lib/mqttx/client/backoff.ex#L1)

Exponential backoff calculator for reconnection delays.

## Usage

    backoff = MqttX.Client.Backoff.new(initial: 1000, max: 30_000)
    {delay, backoff} = MqttX.Client.Backoff.next(backoff)
    # delay = 1000

    {delay, backoff} = MqttX.Client.Backoff.next(backoff)
    # delay = 2000

    backoff = MqttX.Client.Backoff.reset(backoff)

# `t`

```elixir
@type t() :: %MqttX.Client.Backoff{
  current: pos_integer(),
  initial: pos_integer(),
  jitter: float(),
  max: pos_integer(),
  multiplier: float()
}
```

# `current`

```elixir
@spec current(t()) :: pos_integer()
```

Get current delay without advancing.

# `new`

```elixir
@spec new(keyword()) :: t()
```

Create a new backoff calculator.

## Options

- `:initial` - Initial delay in milliseconds (default: 1000)
- `:max` - Maximum delay in milliseconds (default: 30000)
- `:multiplier` - Multiplier for each retry (default: 2.0)
- `:jitter` - Random jitter factor 0-1 (default: 0.1)

# `next`

```elixir
@spec next(t()) :: {pos_integer(), t()}
```

Get the next delay and update the backoff state.

Returns `{delay_ms, new_backoff}`.

# `reset`

```elixir
@spec reset(t()) :: t()
```

Reset the backoff to initial state.

---

*Consult [api-reference.md](api-reference.md) for complete listing*