Returns a specification to start this module under a supervisor.

See Supervisor.

@spec connect(pid(), :inet.ip_address(), :inet.port_number()) :: :ok

Sets the remote edge UDP address for outbound frames.

@spec ensure_label(pid(), binary()) :: {:ok, reference()} | {:error, term()}

Registers a label and returns a channel_ref for SendHandle / Forwarder.

@spec hot_send_dc(pid(), reference(), binary(), :string | :binary) ::
  :ok | {:error, term()}

SendHandle datachannel MFA sink (apply(mod, fun, [pipe, ref, data, type])).

@spec hot_send_rtp(pid(), non_neg_integer(), XMediaLib.Rtp.t()) ::
  :ok | {:error, term()}

SendHandle RTP MFA sink (apply(mod, fun, [pipe, ssrc, rtp])).

@spec local_addr(pid()) ::
  {:ok, {:inet.ip_address(), :inet.port_number()}} | {:error, term()}

Returns the local {ip, port} of the UDP socket.

@spec publish_send_handles(pid()) :: :ok

Publishes RTP + datachannel SendHandle trunk passthrough for this pipe pid.

@spec send_dc(pid(), binary(), binary()) :: :ok | {:error, term()}

Sends an opaque datachannel payload labeled for demux on the far edge.

@spec send_rtp(pid(), non_neg_integer(), XMediaLib.Rtp.t() | binary()) ::
  :ok | {:error, term()}

Encrypts and sends one RTP packet to the connected peer.

@spec set_handler(pid(), pid()) :: :ok

Replaces the inbound handler pid (e.g. your edge-to-edge bridge process).

@spec start_link(keyword()) :: GenServer.on_start()

Starts a trunk pipe.

Opts:

• :handler - pid that receives inbound {__MODULE__, kind, pipe, ...} messages
• :master_key / :master_salt - shared lab keys (both directions)
• :local_write_key / :local_write_salt / :remote_write_key / :remote_write_salt - directional write keys (preferred)
• :port - optional bind port (default 0 ephemeral)

@spec stats(pid()) :: stats()

UDP in/out packet counters (lab assertion that media used UDP).