### Starting and Sending PDUs with Minimal ESME

Source: https://hexdocs.pm/smppex

Demonstrates how to start a minimal ESME client and send a bind_transmitter PDU. This example assumes a functional DummyESME module is defined.

```elixir
{:ok, esme} = DummyESME.start_link(host, port)
SMPPEX.Session.send_pdu(esme, SMPPEX.Pdu.Factory.bind_transmitter("system_id", "password"))
```

--------------------------------

### SMPPEX ESME.Sync Example

Source: https://hexdocs.pm/smppex

Demonstrates how to use SMPPEX.ESME.Sync to connect to an SMSC, bind as a transmitter, send a message, and wait for delivery reports. Requires host and port for the SMSC.

```elixir
 {:ok, esme} = SMPPEX.ESME.Sync.start_link(host, port)

 bind = SMPPEX.Pdu.Factory.bind_transmitter("system_id", "password")
 {:ok, _bind_resp} = SMPPEX.ESME.Sync.request(esme, bind)

 # We are bound, let's send a message

 submit_sm = SMPPEX.Pdu.Factory.submit_sm({"from", 1, 1}, {"to", 1, 1}, "hello!")
 {:ok, submit_sm_resp} = SMPPEX.ESME.Sync.request(esme, submit_sm)

 # Message is sent, let's get the obtained id:

 message_id = SMPPEX.Pdu.field(submit_sm_resp, :message_id)

 # Now let's wait for a delivery report:

 delivery_report? = fn(pdu) ->
 SMPPEX.Pdu.command_name(pdu) == :deliver_sm and
  SMPPEX.Pdu.field(pdu, :receipted_message_id) == message_id
end

delivery_reports = case SMPPEX.ESME.Sync.wait_for_pdus(esme, 60000) do
:stop ->
  Logger.info("Ooops, ESME stopped")
  []
:timeout ->
  Logger.info("No DLR in 60 seconds")
  []
received_items ->
  # Let's filter out DLRs for the previously submitted message
  for {:pdu, pdu}  <- received_items, delivery_report?.(pdu), do: pdu
end
```

--------------------------------

### Simple SMPPEX.MC Implementation

Source: https://hexdocs.pm/smppex

This code defines a basic SMPPEX.MC module that listens for SMPP connections, responds to binds, and handles submit_sm PDUs with incremental message IDs. It requires the SMPPEX library and is designed to be started as a child of a supervisor.

```Elixir
defmodule MC do

  use SMPPEX.Session

  alias SMPPEX.Pdu
  alias SMPPEX.Pdu.Factory, as: PduFactory

  def child_spec(port) do
    Supervisor.child_spec(
      {
        SMPPEX.MC,
        session: {__MODULE__, []},
        transport_opts: [port: port]
      },
      []
    )
  end

  def init(_socket, _transport, []) do
    {:ok, 0}
  end

  def handle_pdu(pdu, last_id) do
    case Pdu.command_name(pdu) do
      :submit_sm ->
        {:ok, [PduFactory.submit_sm_resp(0, to_string(last_id)) |> Pdu.as_reply_to(pdu)], last_id + 1}
      :bind_transmitter ->
        {:ok, [PduFactory.bind_transmitter_resp(0) |> Pdu.as_reply_to(pdu)], last_id}
      _ ->
        {:ok, last_id}
    end
  end

end
```

--------------------------------

### Minimal SMPPEX.ESME Implementation

Source: https://hexdocs.pm/smppex

A basic implementation of SMPPEX.ESME using default callbacks from SMPPEX.Session. This is useful for creating simple ESME clients with minimal boilerplate code.

```elixir
defmodule DummyESME do
  use SMPPEX.Session

  def start_link(host, port) do
    SMPPEX.ESME.start_link(host, port, {__MODULE__, []})
  end
end
```

--------------------------------

### Advanced SMPPEX.ESME for Benchmarking

Source: https://hexdocs.pm/smppex

An advanced ESME implementation designed for benchmarking, handling PDU sending, window size control, and process notification upon completion. It requires specific arguments for port, waiting PID, PDU count, and window size.

```elixir
defmodule SMPPBenchmarks.ESME do

  use SMPPEX.Session
  require Logger

  @from {"from", 1, 1}
  @to {"to", 1, 1}
  @message "hello"

  @system_id "system_id"
  @password "password"

  def start_link(port, waiting_pid, count, window) do
    SMPPEX.ESME.start_link("127.0.0.1", port, {__MODULE__, [waiting_pid, count, window]})
  end

  def init(_, _, [waiting_pid, count, window]) do
    Kernel.send(self(), :bind)
    {:ok, %{waiting_pid: waiting_pid, count_to_send: count, count_waiting_resp: 0, window: window}}
  end

  def handle_resp(pdu, _original_pdu, st) do
    case SMPPEX.Pdu.command_name(pdu) do
    :submit_sm_resp ->
      new_st = %{ st | count_waiting_resp: st.count_waiting_resp - 1 }
      send_pdus(new_st)
    :bind_transmitter_resp ->
      send_pdus(st)
    _ ->
      {:ok, st}
    end
  end

  def handle_resp_timeout(pdu, st) do
    Logger.error("PDU timeout: #{inspect pdu}, terminating")
    {:stop, :resp_timeout, st}

  end

  def terminate(reason, _, st) do
    Logger.info("ESME stopped with reason #{inspect reason}")
    Kernel.send(st.waiting_pid, {self(), :done})
    :stop
  end

  def handle_info(:bind, st) do
    {:noreply, [SMPPEX.Pdu.Factory.bind_transmitter(@system_id, @password)], st}
  end

  defp send_pdus(st) do
    cond do
      st.count_to_send > 0 ->
        count_to_send = min(st.window - st.count_waiting_resp, st.count_to_send)
        new_st = %{ st | count_waiting_resp: st.window, count_to_send: st.count_to_send - count_to_send }
        {:ok, make_pdus(count_to_send), new_st}
      st.count_waiting_resp > 0 ->
        {:ok, st}
      true ->
        Logger.info("All PDUs sent, all resps received, terminating")
        {:stop, :normal, st}
    end
  end

  defp make_pdus(0), do: []
  defp make_pdus(n) do
    for _ <- 1..n, do: SMPPEX.Pdu.Factory.submit_sm(@from, @to, @message)
  end

end
```

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