Telemetry integration for IEC 60870 protocol events and metrics.

Emits events using :telemetry if :telemetry application is loaded and available. If :telemetry is not present in the runtime, invocations degrade gracefully into no-ops.

Supported Events

Raw Message Events:

• [:iec60870, :cs104, :raw_message]
• [:iec60870, :cs101, :raw_message]
  • Measurements: %{byte_size: non_neg_integer()}

  • Metadata: %{pid: pid(), direction: :sent | :received, bytes: binary()}

ASDU Events:

• [:iec60870, :cs104, :asdu]
• [:iec60870, :cs101, :asdu]
  • Measurements: %{count: 1, num_elements: non_neg_integer()}

  • Metadata: %{pid: pid(), direction: :sent | :received, type_id: atom() | non_neg_integer(), cot: atom() | non_neg_integer(), ca: non_neg_integer(), asdu: struct()}

Connection & Link Events:

• [:iec60870, :cs104, :connection_event]
  • Measurements: %{system_time: integer()}

  • Metadata: %{pid: pid(), peer: tuple() | nil, event: atom()}

• [:iec60870, :cs101, :link_state]
  • Measurements: %{system_time: integer()}
  • Metadata: %{pid: pid(), address: integer(), link_state: atom()}

File Transfer Events:

• [:iec60870, :file_service, :transfer]
  • Measurements: %{system_time: integer()}

  • Metadata: %{role: :client | :server, action: atom(), filename: String.t() | nil, status: :started | :progress | :completed | :failed | :aborted}