lua-enet

Official documentation for lua-enet is available here. ENet's features are listed on its homepage. Be wary that there's misspellings and misleading examples in the official documentation.

lua-enet is simply some lua bindings for ENet.

ENet's purpose is to provide a relatively thin, simple and robust network communication layer on top of UDP (User Datagram Protocol).The primary feature it provides is optional reliable, in-order delivery of packets.

ENet omits certain higher level networking features such as authentication, lobbying, server discovery, encryption, or other similar tasks that are particularly application specific so that the library remains flexible, portable, and easily embeddable.

Types

Type	Description
host	An ENet host for communicating with peers.
peer	An ENet peer which data packets may be sent or received from.
event	A simple table containing information on an event.

Functions

Function	Description
host_create	Returns a new host.
host:service	Wait for events, send and receive any ready packets.
host:check_events	Checks for any queued events and dispatches one if available.
host:connect	Connects a host to a remote host. Returns peer object associated with remote host.
host:flush	Sends any queued packets.
host:broadcast	Queues a packet to be sent to all connected peers.
host:channel_limit	Sets the maximum number of channels allowed.
host:bandwidth_limit	Sets the bandwidth limits of the host in bytes/sec.
host:socket_get_address	Returns a string that describes the socket address of the given host.
host:total_sent_data	Returns the number of bytes that were sent through the given host.
host:total_received_data	Returns the number of bytes that were received by the given host.
host:service_time	Returns the timestamp of the last call to host:service() or host:flush().
host:peer_count	Returns the number of peers that are allocated for the given host.
host:get_peer	Returns the connected peer at the specified index (starting at 1).
host:__gc	Destroys the host, freeing any bound ports and addresses.
peer:disconnect	Requests a disconnection from the peer.
peer:disconnect_now	Force immediate disconnection from peer.
peer:disconnect_later	Request a disconnection from peer, but only after all queued outgoing packets are sent.
peer:reset	Forcefully disconnects peer. The peer is not notified of the disconnection.
peer:ping	Send a ping request to peer, updates round_trip_time. This is called automatically at regular intervals.
peer:receive	Attempts to dequeue an incoming packet for this peer.
peer:send	Queues a packet to be sent to peer.
peer:throttle_configure	Changes the probability at which unreliable packets should not be dropped.
peer:ping_interval	Specifies the interval in milliseconds that pings are sent to the other end of the connection (defaults to 500).
peer:timeout	Returns or sets the parameters when a timeout is detected.
peer:index	Returns the index of the peer.
peer:state	Returns the state of the peer.
peer:connect_id	Returns the field ENetPeer::connectID that is assigned for each connection.
peer:round_trip_time	Returns or sets the current round trip time (i.e. ping).
peer:last_round_trip_time	Returns or sets the round trip time of the previous round trip time computation.

Examples

server.lua

-- server.lua
require "enet"
local host = enet.host_create("localhost:6789")
while true do
  local event = host:service(100)
  while event do
    if event.type == "receive" then
      print("Got message: ", event.data, event.peer)
      event.peer:send( "pong" )
    elseif event.type == "connect" then
      print(event.peer .. " connected.")
    elseif event.type == "disconnect" then
      print(event.peer .. " disconnected.")
    end
    event = host:service()
  end
end

client.lua

-- client.lua
require "enet"
local host = enet.host_create()
local server = host:connect("localhost:6789")
while true do
  local event = host:service(100)
  while event do
    if event.type == "receive" then
      print("Got message: ", event.data, event.peer)
      event.peer:send( "ping" )
    elseif event.type == "connect" then
      print(event.peer .. " connected.")
      event.peer:send( "ping" )
    elseif event.type == "disconnect" then
      print(event.peer .. " disconnected.")
    end
    event = host:service()
  end
end