OTClient [1.5] [Mehah] Correct way to call ExtendedOpcode, take json_data in another function

[Error 502]

Hello, good afternoon.

I'm learning to modify modules. The following post caught my attention:

OTClient - Change shader onPositionChange(player, newPos, oldPos)

Hi there! There's a script written by oen that shows a message in the window everytime the player changes an area. I wonder if the could be an extra option, that can be enabled or disabled inside the tables, that triggers a change of shader. Here's the script and the line i'm talking about...

otland.net

modify it a bit. I attach the code at the end:

and Works .





I don't have an updater on the client, so I preferred to send the array via ExtendedOpcode (for future array upgrades, without changing the client).

Thanks to discord user "Tofame" and his "Guide ExtendedOpcodes Explanation" + Oen's explanation: OTClient - Learning (https://otland.net/threads/learning.273475/#post-2634136)
try doing extendedOpcode.

but
Problem: I don't know how to call the onExtendedOpcode_OTC(protocol, code, buffer) here

connect(LocalPlayer, {
     onPositionChange = onExtendedOpcode_OTC--<---- here
   })

or How to get variables "json_data" from the function "function onExtendedOpcode_OTC(protocol, code, buffer)"
to use it in anotherfunction.

I tried multiple times but, I only got it to work with buttons(pressing), but I want to use the onPositionChange

example:

function anotherfunction()
local map = modules.game_interface.getMapPanel()
map:setMapShader(name) -- name global funtion ,from the information sent by the server
end

connect(LocalPlayer, {
onPositionChange = anotherfunction--<---- here
})

Context:
array composed of:

local areas = {
{from = {x = XXX, y = YYY, z = Z}, to = {x = XXX, y = YYY, z =Z}, name = 'Map - Rain'},

From Position
To position
name of "MAP_SHADERS"


(try with user level knowledge of the lua language, convert variable "name" (coming from the array that the server sends with opcode) into a global variable with name = nil. before the code or other methods but at the time of the print, it sent me this information" userdata: 0x028375ebc258" )

MODULE:

function init()
--ProtocolGame.registerExtendedOpcode(15, onExtendedOpcode_OTC)
   local map = modules.game_interface.getMapPanel()
    map:setMapShader('Default')

  connect(LocalPlayer, {
    onPositionChange = updatePosition
  })
  
end

function terminate()
--ProtocolGame.unregisterExtendedOpcode(15, onExtendedOpcode_OTC)
end


local areas = {
{from = {x = 500, y = 253, z = 7}, to = {x = 505, y = 260, z = 7}, name = 'Map - Rain'},
{from = {x = 506, y = 253, z = 7}, to = {x = 511, y = 260, z = 7}, name = 'Map - Snow'},
{from = {x = 512, y = 253, z = 7}, to = {x = 518, y = 260, z = 7}, name = 'Map - Fog'},
{from = {x = 519, y = 253, z = 7}, to = {x = 525, y = 260, z = 7}, name = 'Map - Gray Scale'},
{from = {x = 526, y = 253, z = 7}, to = {x = 532, y = 260, z = 7}, name = 'Map - Bloom'},
{from = {x = 533, y = 253, z = 7}, to = {x = 538, y = 260, z = 7}, name = 'Map - Sepia'},
{from = {x = 539, y = 253, z = 7}, to = {x = 543, y = 260, z = 7}, name = 'Map - Pulse'},
{from = {x = 544, y = 253, z = 7}, to = {x = 548, y = 260, z = 7}, name = 'Map - Old Tv'},
}
function isInRange(position, fromPosition, toPosition)
    return (position.x >= fromPosition.x and position.y >= fromPosition.y and position.z >= fromPosition.z and position.x <= toPosition.x and position.y <= toPosition.y and position.z <= toPosition.z)
end


function updatePosition()

  local player = g_game.getLocalPlayer()
  if not player then return end
  local pos = player:getPosition()
  if not pos then return end
 
  local name = 'Default'
 
  for _, TABLE in ipairs(areas) do
      if isInRange(pos, TABLE.from, TABLE.to) then
        name = TABLE.name
      end
  end
  
      local map = modules.game_interface.getMapPanel()
    map:setMapShader(name)
end
---------FAIL OPCODE
-- function onExtendedOpcode_OTC(protocol, code, buffer)
  -- local json_status, json_data =
    -- pcall(
    -- function()
      -- return json.decode(buffer)
    -- end
  -- )

  -- if not json_status then
    -- g_logger.error("[My Module] JSON error: " .. json_data)
    -- return false
  -- end

    -- local player = g_game.getLocalPlayer()
  -- if not player then return end
  -- local pos = player:getPosition()
  -- if not pos then return end
  -- name = 'Default'
  -- for _, TABLE in ipairs(json_data) do
      -- if isInRange(pos, TABLE.from, TABLE.to) then
        -- name = TABLE.name
      -- end
  -- end
-- print(name)
-- print(json_data)
      -- local map = modules.game_interface.getMapPanel()
                    -- map:setMapShader(name).

-- end

SERVER :

player:registerEvent("ExtendedOpcode")

on login
+

function onExtendedOpcode(player, opcode, buffer)
    if opcode == 15 then
local areas= {
{from = {x = 500, y = 253, z = 7}, to = {x = 505, y = 260, z = 7}, name = 'Map - Rain'},
{from = {x = 506, y = 253, z = 7}, to = {x = 511, y = 260, z = 7}, name = 'Map - Snow'},
{from = {x = 512, y = 253, z = 7}, to = {x = 518, y = 260, z = 7}, name = 'Map - Fog'},
{from = {x = 519, y = 253, z = 7}, to = {x = 525, y = 260, z = 7}, name = 'Map - Gray Scale'},
{from = {x = 526, y = 253, z = 7}, to = {x = 532, y = 260, z = 7}, name = 'Map - Bloom'},
{from = {x = 533, y = 253, z = 7}, to = {x = 538, y = 260, z = 7}, name = 'Map - Sepia'},
{from = {x = 539, y = 253, z = 7}, to = {x = 543, y = 260, z = 7}, name = 'Map - Pulse'},
{from = {x = 544, y = 253, z = 7}, to = {x = 548, y = 260, z = 7}, name = 'Map - Old Tv'},
}
        player:sendExtendedOpcode(15, json.encode(response))     
    end
end

Source: Module game _banana by Tofame Discord "ExtendedOpcodes Explanation,"
Module game_areas by Oen44 , ralke? "Change shader onPositionChange(player, newPos, oldPos)"

Server : nekiro 1.5 downgrade
OTClient: Mehah +2.6.2

Regards