Only sync once every second. Also:

Fixed some indentations

init.lua

@@ -7,27 +7,27 @@ local modpath = minetest.get_modpath(minetest.get_current_modname())
 local ie, req_ie = _G, minetest.request_insecure_environment
 if req_ie then ie = req_ie() end
 if not ie then
-	error("The Matrix mod requires access to insecure functions in order "..
+  error("The Matrix mod requires access to insecure functions in order "..
-		"to work.  Please add the matrix mod to your secure.trusted_mods "..
+    "to work.  Please add the matrix mod to your secure.trusted_mods "..
-		"setting or disable the matrix mod.")
+    "setting or disable the matrix mod.")
 end
 
 ie.package.path =
-		modpath.."/lua-matrix/?.lua;"
+    modpath.."/lua-matrix/?.lua;"
-		..ie.package.path
+    ..ie.package.path
 
 matrix = {
-	version = "0.0.1",
+  version = "0.0.1",
-	joined_players = {},
+  joined_players = {},
-	connected = false,
+  connected = false,
-	modpath = modpath,
+  modpath = modpath,
-	lib = lib,
+  lib = lib,
 }
 
 dofile(modpath.."/config.lua")
 
 local function eprintf(fmt, ...)
-	 minetest.log("info", fmt:format(...))
+  minetest.log("info", fmt:format(...))
 end
 
 local client = require("matrix").client("https://"..matrix.config.server..":"..matrix.config.port)
@@ -41,11 +41,11 @@ client:hook("invite", function (client, room)
     client:join_room(room)
   end
 end):hook("logged-in", function (client)
-	matrix.connected = true
+  matrix.connected = true
   eprintf("Logged in successfully\n")
 end):hook("logged-out", function (client)
-	eprintf("Logged out... bye!\n")
+  eprintf("Logged out... bye!\n")
-	matrix.connected = false
+  matrix.connected = false
 end):hook("left", function (client, room)
    eprintf("Left room %s, active rooms:\n", room)
    for room_id, room in pairs(client.rooms) do
@@ -61,7 +61,7 @@ end):hook("joined", function (client, room)
 
    --room:send_text("Type “!bot quit” to make the bot exit")
 
-   room:hook("message", function (room, sender, message, event)
+  room:hook("message", function (room, sender, message, event)
       if event.origin_server_ts < start_ts then
         eprintf("%s: (Skipping message sent before bot startup)\n", room)
         return
@@ -77,9 +77,9 @@ end):hook("joined", function (client, room)
 
       eprintf("%s: <%s> %s\n", room, sender, message.body)
 
-			if message.body == "!bot quit" then
+      if message.body == "!bot quit" then
         for _, room in pairs(client.rooms) do
-        room:send_text("(gracefully shutting down)")
+          room:send_text("(gracefully shutting down)")
         end
         client:logout()
         matrix.connected = false
@@ -92,52 +92,54 @@ end)
 
 dofile(modpath.."/callback.lua")
 
-local stepnum = 0
-
 minetest.register_globalstep(function(dtime) return matrix.step(dtime) end)
 
-function matrix.step()
+local stepnum = 0
-	if stepnum == 3 then
+local interval = 1
-		matrix.connect()
+local counter = 0
-	end
-	stepnum = stepnum + 1
 
-	if not matrix.connected then return end
+function matrix.step(dtime)
-
+  if stepnum == 3 then
-	-- Hooks will manage incoming messages and errors
+    matrix.connect()
-	local good, err = xpcall(function() client:_sync() end, debug.traceback)
+  end
-	if not good then
+  stepnum = stepnum + 1
-		print(err)
+  counter = counter + dtime
-		return
+  if counter >= interval and matrix.connected then
-	end
+    counter = counter - interval
+    local good, err = xpcall(function() client:_sync() end, debug.traceback)
+    if not good then
+      print(err)
+      return
+    end
+  end
 end
 
 function matrix.connect()
-	if matrix.connected then
+  if matrix.connected then
-		minetest.log("error", "Matrix: already connected")
+    minetest.log("error", "Matrix: already connected")
-		return
+    return
-	end
+  end
-	client:login_with_password(matrix.config.user, matrix.config.password, true)
+  client:login_with_password(matrix.config.user, matrix.config.password, true)
-	matrix.connected = true
+  matrix.connected = true
-	minetest.log("action", "Matrix: Connected!")
+  minetest.log("action", "Matrix: Connected!")
-	minetest.chat_send_all("Matrix: Connected!")
+  minetest.chat_send_all("Matrix: Connected!")
 end
 
 
 function matrix.disconnect(message)
-	if matrix.connected then
+  if matrix.connected then
-		--The OnDisconnect hook will clear matrix.connected and print a disconnect message
+    --The OnDisconnect hook will clear matrix.connected and print a disconnect message
-		client:logout()
+    client:logout()
-	end
+  end
 end
 
 function matrix.say(to, message)
-	if not message then
+  if not message then
-		message = to
+    message = to
-		to = matrix.config.channel
+    to = matrix.config.channel
-	end
+  end
-	to = to or matrix.config.channel
+  to = to or matrix.config.channel
-	for room_id, room in pairs(client.rooms) do
+  for room_id, room in pairs(client.rooms) do
-	  room:send_text(message)
+    room:send_text(message)
-	end
+  end
 end