# `Grizzly.ZWave.Commands.NodeInfoCachedGet`
[🔗](https://github.com/smartrent/grizzly/blob/v9.1.4/lib/grizzly/zwave/commands/node_info_cached_get.ex#L1)

Get the node information that is cached on another device

This is useful for getting the command classes and device classes

When sending this command the Z-Wave network should send back a
`NodeInfoCachedReport` command.

Params:
  `:seq_number` - the sequence number for the networked command (required)
  `:max_age` - the max age of the node info frame give in 2^n minutes
   see section on cached minutes below for more information (optional)
  `:node_id` - the node id that that node information is being requested for
  (required)

## Cached Minutes

This Z-Wave network will cache node information to perverse bandwidth and
provides access to node information about sleeping nodes.

When sending the `NodeInfoCachedGet` command we can specify the max age of
the cached data. If the cached data is older than the `:max_age` param the
Z-Wave network will try to refresh the cache and send back the most updated
information.

The values for the `:max_age` parameter are numbers from 1 to 14. This number
will be 2 ^ number minutes. So if you pass the number `4` the receiving
Z-Wave device will consider that 16 minutes.

Two other options are `:infinity` and `:force_update`. Where `:infinity`
means that the cache will not be freshed regardless of how old the data is
and where `:force_update` means that no matter the age of the cached node
data the cache will attempt to be updated.

We default to `10` which `1024` minutes, or just a little over 1 day. This
default is chosen to limit bandwidth usage. Also, the data found in the
report is fairly static, so there isn't a pressing need to update the cache
to often.

# `max_age`

```elixir
@type max_age() :: 1..14 | :infinity | :force_update
```

# `param`

```elixir
@type param() ::
  {:seq_number, Grizzly.seq_number()}
  | {:node_id, Grizzly.ZWave.node_id()}
  | {:max_age, max_age()}
```

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