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http://www.mushclient.com/plugins/Reconnecter.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE muclient [
  <!ENTITY interval "10" >
  <!ENTITY quit_command "QUIT" >
  <!ENTITY connect_command "CONNECT" >
  <!ENTITY noconnect_command "NOCONNECT" >
]>

<!--
1. Change the entity above "interval" to be the number of seconds
between retries.

2. Change the entity above "quit_command" to be the command you
type to quit (eg. quit, QUIT, @quit or whatever)

3. Change the entity above "connect_command" to be the command you
type to enable connection checking.

4. Change the entity above "noconnect_command" to be the command you
type to disable connection checking.
   
-->

<muclient>
<plugin
   name="Reconnecter_Lua"
   author="Nick Gammon"
   id="42c2c0b90c00344c55eabdfe"
   language="Lua"
   purpose="Reconnects when disconnected"
   date_written="2017-12-24"
   requires="4.00"
   version="1.0"
   >
<description trim="y">
<![CDATA[
This plugin will automatically reconnect you when you are disconnected, 
at a user-configurable interval (say, every 5 seconds)
]]>

Reconnecter:help - this help screen

&connect_command;  - enable recconnection (eg. after using &noconnect_command;)

&noconnect_command; - disable reconnection (eg. if you are leaving the PC)

</description>

</plugin>


<!--  Timers  -->

<timers>
  <timer 
      name="ConnectCheckTimer" 
      script="OnConnectCheckTimer" 
      second="&interval;" 
      active_closed="y" 
      enabled="y">

  </timer>
</timers>

<!--  Aliases  -->

<aliases>
  <alias
   script="OnQuit"
   match="&quit_command;"
   enabled="y"
  >
  </alias>

  <alias
   script="OnConnect"
   match="&connect_command;"
   enabled="y"
  >
  </alias>
  <alias
   script="OnNoConnect"
   match="&noconnect_command;"
   enabled="y"
  >
  </alias>
</aliases>

<!--  Script  -->


<script>
<![CDATA[

retry = 0
did_quit = false

function OnConnectCheckTimer (sName)
--
--  If currently connecting, leave it to do that ...
--

if world.GetInfo (107) then 
  return 
end -- if

--
--  If currently connected, we don't need to check any more
--
if IsConnected () then
  ColourNote ("yellow", "", "World is connected, disabling disconnection check")
  EnableTimer (sName, false)
  return
end -- if

--
--  If deliberate quit, we don't need to check any more
--
if did_quit then
   ColourNote ("yellow", "", "Deliberate quit, disabling disconnection check")
  EnableTimer (sName, false)
  return
end -- if

--
--  OK, we need to connect now ...
--

retry = retry + 1

ColourNote ("yellow", "", "Connecting to world, attempt # " .. retry)
Connect ()

end -- function OnConnectCheckTimer

function OnPluginDisconnect ()
--
--  If deliberate quit, we don't need to enable the connection check
--
if did_quit then
  return
end -- if did a deliberate quite

--
--  We have been disconnected, we need to try connecting again
--
  ColourNote ("yellow", "", "Connection checker enabled")
  EnableTimer ("ConnectCheckTimer", true)
end -- function OnPluginDisconnect

function OnPluginConnect ()
--
--  Now we are connected, no need to keep trying to connect
--
  retry = 0
  EnableTimer ("ConnectCheckTimer", false)
--
--  No deliberate quit yet
--
  did_quit = false
end -- function OnPluginConnect

function OnPluginInstall ()
  DoAfterNote (1, "Connection checker installed.")
end -- function OnPluginInstall

]]>

function OnQuit (sName, sLine, wildcards)
  did_quit = true
  Send ("&quit_command;")  -- send to world so it does it
  ColourNote ("yellow", "", "Deliberate quit (&quit_command;), reconnect disabled")
end -- function OnQuit

function OnConnect (sName, sLine, wildcards)
  ColourNote ("yellow", "", "Connection checker enabled")
  EnableTimer ("ConnectCheckTimer", true)
  did_quit = false
end -- function OnConnect

function OnNoConnect (sName, sLine, wildcards)
  ColourNote ("yellow", "", "Connection checker disabled")
  EnableTimer ("ConnectCheckTimer", false)
  did_quit = true
end -- function OnNoConnect

</script>


<!--  Plugin help  -->

<aliases>
  <alias
   script="OnHelp"
   match="Reconnecter:help"
   enabled="y"
  >
  </alias>
</aliases>

<script>
<![CDATA[
function OnHelp (sName, sLine, wildcards)
  Note (GetPluginInfo (GetPluginID (), 3))
end -- function OnHelp
]]>
</script> 

</muclient>

<plugin
   name="Reconnecter"
   author="Nick Gammon"
   id="dc8cb4a314674db813c12c90"
   language="Lua"
   purpose="Reconnects when disconnected"
   date_written="2007-12-12 11:30:00"
   requires="3.80"
   version="2.0"
   >

  Note (GetPluginInfo (GetPluginID, 3))

  Note (GetPluginInfo (GetPluginID (), 3))