SMPPEX.ESME.Sync.start_link

You're seeing just the function start_link, go back to SMPPEX.ESME.Sync module for more information.
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start_link(host, port, opts \\ [])

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Specs

start_link(host :: term(), port :: non_neg_integer(), opts :: Keyword.t()) ::
  GenServer.on_start()

Starts SMPPEX.ESME.Sync.

opts is a keyword list of SMPPEX.ESME options which is directly passed to the underlying SMPPEX.ESME.start_link/4 call.