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Elixir wrapper for Snap7, for communication with Siemens PLC's.

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snapex7 test s7_client_test directory_fun_test.exs
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test/s7_client_test/directory_fun_test.exs

defmodule DirectoryFunTest do
use ExUnit.Case
doctest Snapex7
setup do
{:ok, pid} = Snapex7.Client.start_link()
Snapex7.Client.connect_to(pid, ip: "192.168.0.1", rack: 0, slot: 1)
{:ok, state} = :sys.get_state(pid) |> Map.fetch(:state)
%{pid: pid, status: state}
end
# functions no supported by PLC s7-1200
test "list_blocks function", state do
case state.status do
:connected ->
resp = Snapex7.Client.list_blocks(state.pid)
assert resp == {:error, %{eiso: nil, es7: :errCliFunNotAvailable, etcp: nil}}
_ ->
IO.puts("(#{__MODULE__}) Not connected")
end
end
test "list_blocks_of_type function", state do
case state.status do
:connected ->
resp = Snapex7.Client.list_blocks_of_type(state.pid, :OB, 2)
assert resp == {:error, %{eiso: nil, es7: :errCliItemNotAvailable, etcp: nil}}
_ ->
IO.puts("(#{__MODULE__}) Not connected")
end
end
test "get_ag_block_info function", state do
case state.status do
:connected ->
resp = Snapex7.Client.get_ag_block_info(state.pid, :OB, 2)
assert resp == {:error, %{eiso: nil, es7: :errCliFunNotAvailable, etcp: nil}}
_ ->
IO.puts("(#{__MODULE__}) Not connected")
end
end
test "get_pg_block_info function", state do
case state.status do
:connected ->
resp = Snapex7.Client.get_pg_block_info(state.pid, <<0x01, 0x02, 0x03>>)
assert resp == {:error, %{eiso: nil, es7: :errCliInvalidBlockSize, etcp: nil}}
_ ->
IO.puts("(#{__MODULE__}) Not connected")
end
end
end