VintageNet.PowerManager.PMControl.send_message

You're seeing just the function send_message, go back to VintageNet.PowerManager.PMControl module for more information.
Link to this function

send_message(ifname, message)

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Specs

send_message(VintageNet.ifname(), any()) :: any()

Send an arbitrary message to the power manager for an interface

This will be received by the PowerManager's handle_info/2 callback.