defmodule Grizzly do
use TelemetryRegistry
telemetry_event %{
event: [:grizzly, :zip_gateway, :crash],
description: "Emitted when the Z/IP Gateway process exits abnormally.",
measurements: "N/A",
metadata: "N/A"
}
telemetry_event %{
event: [:grizzly, :zwave, :s2_resynchronization],
description: "Emitted when an S2 resynchronization event occurs.",
measurements: "%{system_time: non_neg_integer()}",
metadata: "%{node_id: non_neg_integer(), reason: non_neg_integer()}"
}
@moduledoc """
Send commands, subscribe to unsolicited events, and other helpers.
## Unsolicited Events
In order to receive unsolicited events from the Z-Wave network you must subscribe to the
corresponding command (e.g. `:battery_report`, `:alarm_report`, etc.).
Whenever an unsolicited event is received from a device, subscribers will receive messages
in the following format:
{:grizzly, :event, %Grizzly.Report{}}
The `Grizzly.Report` struct will contain the id of the sending node, a `Grizzly.ZWave.Command`
struct with the command name and arguments, and any additional metadata. Refer to `Grizzly.Report`
and `Grizzly.ZWave.Command` for details.
## Telemetry
#{telemetry_docs()}
"""
alias Grizzly.Commands.Table
alias Grizzly.{Connection, FirmwareUpdates, Inclusions, Report, VersionReports, VirtualDevices}
alias Grizzly.UnsolicitedServer.Messages
alias Grizzly.{ZIPGateway, ZWave}
alias Grizzly.ZWave.Commands.RssiReport
require Logger
import Grizzly.VersionReports, only: [is_extra_command: 1]
@typedoc """
The response from sending a Z-Wave command.
When everything is okay the response will be `{:ok, Grizzly.Report{}}`. For
documentation about a report see `Grizzly.Report` module.
When there are errors the response will be in the pattern of
`{:error, reason}`.
Three reasons that Grizzly supports for all commands are `:nack_response`,
`:update_firmware`, and `:including`.
### Including
An `:including` response means that the controller is in inclusion, exclusion,
or learn mode and cannot process any commands. Either cancel the inclusion (see
`Grizzly.Inclusions`) or wait until the inclusion is complete before trying again.
### Nack response
A `:nack_response` normally means that the Z-Wave node that you were trying
to send a command to is unreachable and did not receive your command at all.
This could mean that the Z-Wave network is overloaded and you should reissue
the command, the device is too far from the controller, or the device is no
longer part of the Z-Wave network (e.g. due to a factory reset).
By default, Grizzly will retry the command twice before sending returning a
`:nack_response`. This is configurable via the `:retries` command option in
the `Grizzly.send_command/4` function. This helps increase the reliability of
sending commands during Z-Wave network congestion.
### Queue full
Sleeping devices can only receive commands when they are wake up, so Z/IP Gateway
queues commands to be sent when it receives a wake up notification from the device.
However, it will only queue a limited number of commands. A `:queue_full` response
is returned in this situation.
"""
@type send_command_response() :: {:ok, Report.t()} | {:error, send_command_error()}
@type send_command_error() ::
:including | :firmware_updating | :nack_response | :queue_full | :timeout
@type seq_number() :: non_neg_integer()
@type node_id() :: non_neg_integer()
@typedoc """
A custom handler for the command.
See the `Grizzly.CommandHandler` behaviour for more documentation.
"""
@type handler_spec() :: {module(), args :: any()}
@type handler() :: module() | handler_spec()
@typedoc """
Options for `Grizzly.send_command/4`.
* `:timeout` - Time (in milliseconds) to wait for an ACK or report before timing out.
Maximum 140 seconds. Default `15_000`.
* `:retries` - Number of retries in case the node responds with a NACK. Default `0`.
* `:handler` - A custom response handler (see `Grizzly.CommandHandler`). Ignored if
`supervision?` is true.
* `:transmission_stats` - If true, transmission stats will be included with the
returned report (if available). Default `false`.
* `:supervision?` - Whether to use Supervision CC encapsulation. Default `false`.
* `:status_updates?` - If true, the calling process will receive messages when
a supervision status update is received from the destination node. Default `false`.
* `:mode` - The connection mode to use when sending the command. Defaults to `:sync`.
Using `:async` will result in the returned `Grizzly.Report` always having a type of
`:queued_delay`.
"""
@type command_opt() ::
{:timeout, non_neg_integer()}
| {:retries, non_neg_integer()}
| {:handler, module() | handler_spec()}
| {:transmission_stats, boolean()}
| {:supervision?, boolean()}
| {:status_updates?, boolean()}
| {:mode, Connection.mode()}
@type command :: atom()
@doc """
Guard for checking if device is a virtual device or not
"""
defguard is_virtual_device(device_id) when is_tuple(device_id)
@doc """
Check to if the device id is a virtual device or a regular Z-Wave devices
"""
@spec virtual_device?(:gateway | ZWave.node_id() | VirtualDevices.id()) :: boolean()
def virtual_device?(device_id) do
is_virtual_device(device_id)
end
@doc """
Send a command to the node via the node id or to Z/IP Gateway.
## Arguments
* `node_id` - The node id to send the command to. If `:gateway` is passed, the command
will be sent to the locally running Z/IP Gateway -- this is useful if this controller
has a node id other than 1.
* `command` - The command to send. See `Grizzly.Commands.Table` for a list of available commands
and their associated modules.
* `args` - A list of arguments to pass to the command. See the associated command module
for details.
* `opts` - A keyword list of options to control how the command is sent and processed.
See `t:Grizzly.command_opt/0` for details.
## Usage
# A command with no arguments or options:
Grizzly.send_command(node_id, :switch_binary_get)
# ... with arguments:
Grizzly.send_command(node_id, :switch_binary_set, value: :off)
# ... with arguments and options:
Grizzly.send_command(node_id, :switch_binary_get, [], timeout: 10_000, retries: 5)
## Return values and errors
Following are the most common return values and errors that you will see. For a
complete list, see `t:Grizzly.send_command_response/0`.
* `{:ok, Grizzly.Report.t()}` - the command was sent and the Z-Wave device
responded with an ACK or a report. See `Grizzly.Report` for more information.
* `{:error, :including}` - the Z-Wave controller is currently in inclusion or exclusion mode
* `{:error, :firmware_updating}` - the Z-Wave controller is undergoing a firmware update
* `{:error, reason}` - see `t:Grizzly.send_command_response/0`
"""
@spec send_command(
ZWave.node_id() | :gateway | VirtualDevices.id(),
command(),
args :: list(),
[command_opt()]
) ::
send_command_response()
def send_command(node_id, command_name, args \\ [], opts \\ [])
def send_command(node_id, command_name, args, _opts) when is_virtual_device(node_id) do
with {command_module, _default_opts} <- Table.lookup(command_name),
{:ok, command} <- command_module.new(args) do
VirtualDevices.send_command(node_id, command)
end
end
def send_command(
:gateway,
:version_command_class_get,
[command_class: command_class],
_opts
)
when is_extra_command(command_class) do
{:ok, version_report} = VersionReports.version_report_for(command_class)
{:ok, %Report{command: version_report, node_id: :gateway, status: :complete, type: :command}}
end
def send_command(node_id, command_name, args, opts) do
# always open a connection. If the connection is already opened this
# will not establish a new connection
open_opts = Keyword.take(opts, [:mode])
with :ok <- can_send_command?(),
{command_module, default_opts} <- Table.lookup(command_name),
{:ok, command} <- command_module.new(args),
{:ok, _} <- Connection.open(node_id, open_opts) do
Connection.send_command(node_id, command, Keyword.merge(default_opts, opts))
end
end
@doc false
@spec send_async_command_via(GenServer.name(), ZWave.node_id(), command(), list(), [
command_opt()
]) ::
send_command_response()
def send_async_command_via(conn, node_id, command_name, args \\ [], opts \\ []) do
with :ok <- can_send_command?(),
{command_module, default_opts} <- Table.lookup(command_name),
{:ok, command} <- command_module.new(args) do
Connection.send_async_command_via(conn, node_id, command, Keyword.merge(default_opts, opts))
end
end
@doc """
Send a raw binary to the Z-Wave node.
This function does not block and expects the sending process to handle the
lifecycle of the command being sent. This maximizes control but minimizes
safety and puts things such as timeouts, retries, and response handling in
the hand of the calling process.
When sending a binary command to a Z-Wave node, the binary must be encapsulated
in a Z/IP Packet (see `Grizzly.ZWave.Commands.ZIPPacket`).
seq_no = 0x01
{:ok, my_command} = Grizzly.ZWave.Commands.SwitchBinaryGet.new()
{:ok, packet} = Grizzly.ZWave.Commands.ZIPPacket.with_zwave_command(my_command, seq_no)
binary = Grizzly.ZWave.to_binary(packet)
Grizzly.send_binary(node_id, binary)
This can be useful when you need very fine-grained control of the outgoing Z/IP Packet,
if you need to send a command that has not been implemented in Grizzly yet (contributions
are welcome!), or for debugging purposes.
After sending a binary packet the calling process will receive a message in the form of:
{:grizzly, :binary_response, <<...>>}
"""
@spec send_binary(ZWave.node_id(), binary()) :: :ok | {:error, :including | :firmware_updating}
def send_binary(node_id, binary) do
with :ok <- can_send_command?() do
{:ok, _} = Connection.open(node_id, mode: :binary)
Connection.send_binary(node_id, binary)
end
end
@doc """
Subscribe to unsolicited events for the given command.
"""
@spec subscribe_command(command()) :: :ok
defdelegate subscribe_command(command_name), to: Messages, as: :subscribe
@doc """
Unsubscribe from an unsolicited event.
"""
@spec unsubscribe_command(command()) :: :ok
defdelegate unsubscribe_command(command_name), to: Messages, as: :unsubscribe
@doc """
Subscribe to unsolicited events for multiple commands.
"""
@spec subscribe_commands([command()]) :: :ok
def subscribe_commands(command_names) do
Enum.each(command_names, &subscribe_command/1)
end
@doc """
Subscribe to all events from a particular Z-Wave device.
NOTE: Subscribers using both `subscribe_node` and `subscribe_command` **will**
receive duplicate messages.
"""
defdelegate subscribe_node(node_id), to: Messages
@doc """
Subscribe to all events from a group of Z-Wave devices.
NOTE: Subscribers using both `subscribe_node` and `subscribe_command` **will**
receive duplicate messages.
"""
@spec subscribe_nodes([node_id() | VirtualDevices.id()]) :: :ok
def subscribe_nodes(node_ids) do
Enum.each(node_ids, &subscribe_node/1)
end
@doc """
Delete a subscription created with `subscribe_node/1`.
"""
defdelegate unsubscribe_node(node_id), to: Messages
@doc """
List all supported Z-Wave commands.
"""
@spec list_commands() :: [atom()]
def list_commands() do
Enum.map(Table.dump(), fn {command, _} -> command end)
end
@doc """
List the supported Z-Wave commands for a particular command class.
"""
@spec commands_for_command_class(atom()) :: [atom()]
def commands_for_command_class(command_class_name) do
Table.dump()
|> Enum.filter(fn {_command, {command_module, _}} ->
{:ok, command} = command_module.new([])
command.command_class == command_class_name
end)
|> Enum.map(fn {command, _} -> command end)
end
@doc """
Sends a no-op command to the given node to check its reachability. Transmission
stats are enabled by default.
"""
@spec ping(ZWave.node_id(), [command_opt()]) :: send_command_response()
def ping(node_id, opts \\ []) do
opts = Keyword.put_new(opts, :transmission_stats, true)
send_command(node_id, :no_operation, [], opts)
end
@doc """
Reports the gateway's current background RSSI (noise).
"""
@spec background_rssi() :: {:ok, [RssiReport.param()]} | {:error, any()}
def background_rssi() do
case send_command(:gateway, :rssi_get) do
{:ok, %Report{command: %ZWave.Command{params: params}}} ->
{:ok, params}
{_, %Grizzly.Report{type: :timeout}} ->
{:error, :timeout}
{:error, reason} ->
{:error, reason}
end
end
@doc """
Whether Grizzly supports sending the given command with supervision.
"""
@spec can_supervise_command?(Grizzly.command()) :: boolean()
defdelegate can_supervise_command?(command_name),
to: Grizzly.Commands.Table,
as: :supports_supervision?
@doc """
Restarts the Z/IP Gateway process. An error will be raised if `Grizzly.ZIPGateway.Supervisor`
is not running.
"""
@spec restart_zipgateway :: :ok
defdelegate restart_zipgateway(), to: Grizzly.ZIPGateway.Supervisor
@doc "Stops the Z/IP Gateway process if it is running."
@spec stop_zipgateway :: :ok
defdelegate stop_zipgateway(), to: Grizzly.ZIPGateway.Supervisor
@doc "Get the current inclusion status."
@spec inclusion_status() :: Inclusions.status()
defdelegate inclusion_status(), to: Inclusions.StatusServer, as: :get
@doc """
Returns the network's home id. Returns nil if Grizzly is started with `run_zipgateway: false`
or if Z/IP Gateway has not yet logged the home id.
"""
@spec home_id() :: binary() | nil
def home_id() do
case GenServer.whereis(ZIPGateway.LogMonitor) do
nil -> nil
pid -> ZIPGateway.LogMonitor.home_id(pid)
end
end
@doc """
Returns the network encryption keys. Returns nil if Grizzly is started with
`run_zipgateway: false` or if Z/IP Gateway has not yet logged the network keys.
"""
@spec network_keys() :: [{ZIPGateway.LogMonitor.network_key_type(), binary()}] | nil
def network_keys() do
case GenServer.whereis(ZIPGateway.LogMonitor) do
nil -> nil
pid -> ZIPGateway.LogMonitor.network_keys(pid)
end
end
@doc """
Returns the network encryption keys formatted for use with the Zniffer application.
See `Grizzly.ZIPGateway.LogMonitor.zniffer_network_keys/1` for more information.
"""
@spec zniffer_network_keys() :: binary() | nil
def zniffer_network_keys() do
case GenServer.whereis(ZIPGateway.LogMonitor) do
nil -> nil
pid -> ZIPGateway.LogMonitor.zniffer_network_keys(pid)
end
end
@doc """
Return the options `Grizzly.Supervisor` was started with. Returns nil if supervisor
is not started.
"""
@spec options() :: Grizzly.Options.t() | nil
def options() do
Agent.get(Grizzly.Options.Agent, &Function.identity/1)
catch
:exit, {:noproc, _} ->
nil
end
@spec can_send_command?() :: :ok | {:error, :including | :firmware_updating}
defp can_send_command?() do
including? = Inclusions.inclusion_running?()
updating_firmware? = FirmwareUpdates.firmware_update_running?()
case {including?, updating_firmware?} do
{true, _} -> {:error, :including}
{_, true} -> {:error, :firmware_updating}
_ -> :ok
end
end
end
