Add ATT commands for GATT indications

lib/blue_heron/att.ex

@@ -16,6 +16,8 @@ defmodule BlueHeron.ATT do
     FindByTypeValueResponse,
     FindInformationRequest,
     FindInformationResponse,
+    HandleValueIndication,
+    HandleValueConfirmation,
     PrepareWriteRequest,
     PrepareWriteResponse,
     ReadBlobRequest,
@@ -99,6 +101,12 @@ defmodule BlueHeron.ATT do
   def deserialize(base, <<0x1B, _::binary>> = read_by_group_type_request),
     do: %{base | data: HandleValueNotification.deserialize(read_by_group_type_request)}
 
+  def deserialize(base, <<0x1D, _::binary>> = handle_value_indication),
+    do: %{base | data: HandleValueIndication.deserialize(handle_value_indication)}
+
+  def deserialize(base, <<0x1E, _::binary>> = handle_value_confirmation),
+    do: %{base | data: HandleValueConfirmation.deserialize(handle_value_confirmation)}
+
   def deserialize(base, <<0x52, _::binary>> = read_by_group_type_request),
     do: %{base | data: WriteCommand.deserialize(read_by_group_type_request)}
 

lib/blue_heron/att/confirmations/handle_value_confirmation.ex

@@ -0,0 +1,11 @@
+defmodule BlueHeron.ATT.HandleValueConfirmation do
+  defstruct [:opcode]
+
+  def serialize(%{}) do
+    <<0x1E>>
+  end
+
+  def deserialize(<<0x1E>>) do
+    %__MODULE__{opcode: 0x1E}
+  end
+end

lib/blue_heron/att/indications/handle_value_indication.ex

@@ -0,0 +1,15 @@
+defmodule BlueHeron.ATT.HandleValueIndication do
+  defstruct [:opcode, :handle, :value]
+
+  def serialize(%{handle: handle, value: value}) do
+    <<0x1D, handle::little-16, value::binary>>
+  end
+
+  def deserialize(<<0x1D, handle::little-16, value::binary>>) do
+    %__MODULE__{
+      opcode: 0x1D,
+      handle: handle,
+      value: value
+    }
+  end
+end