TFS 1.X+ Help with JSON, TFS1.3 and OTC

[Fischturd]

Hey there, wondering if anybody could help me out with this?
The TLDR is it is a module that should populate spells learned by character, when clicking on spell it should cast. The module opens, but nothing is in it.

Server side

local OPCODE_CASTER = 108
local storage = 55390
function onExtendedOpcode(player, opcode, buffer)
    local status, json_data =
      pcall(
      function()
        return json.decode(buffer)
      end
    )

    if not status then
      return false
    end

    local action = json_data.action
    local data = json_data.data

    local spells = {}
    if opcode == OPCODE_CASTER then
        if action == "refresh" then
            for _, spell in ipairs(player:getInstantSpells()) do
                if player:getLevel() > spell.level then
                    spells[#spells + 1] = spell
                end
            end
        table.sort(spells, function(a, b) return a.level > b.level end)
        player:sendExtendedOpcode(OPCODE_CASTER, json.encode({action = "refresh", data = spells}))
        elseif action == "cast" then
            player:setStorageValue(storage, 1)
        end
    end
    return true
end

Client side

spellscasterWindow = nil
spellscasterButton = nil
spellsTable = nil

spells = nil
 
function init()
  spellscasterWindow = g_ui.loadUI('spellscaster', modules.game_interface.getLeftPanel())
  spellscasterWindow:setup()

  g_keyboard.bindKeyPress('Delete', toggle)

  connect(g_game, {
    onGameStart = refresh,
    onGameEnd = offline
  })
     local protocolGame = g_game.getProtocolGame()
      if protocolGame then
        protocolGame.registerExtendedOpcode(108, onExtendedOpcode)
      end
 spellscasterButton = modules.client_topmenu.addRightToggleButton('spellscasterButton', tr('Spellbook'), '/images/topbuttons/spelllist', toggle)
 spellscasterButton:setOn(true)
end

function terminate()
        protocolGame.unregisterExtendedOpcode(108, onExtendedOpcode)
end


function onExtendedOpcode(protocol, code, buffer)
  local json_status, json_data =
    pcall(
    function()
      return json.decode(buffer)
    end
  )
  if not json_status then
    g_logger.error("SHOP json error: " .. json_data)
    return false
  end

  local action = json_data.action
  local data = json_data.data
  if not action or not data then
    return false
  end
  if action == "refresh" then
    spells = data
    refresh()
  end
end

function offline()
  spellscasterWindow:hide()
end
 
function refresh()
 local uiList = spellscasterWindow.contentsPanel
 --local cleanList = uiList:getChildren()
  --for k = 1, #children do children[k]:destroy() end
 for i = 1, #spells do
  local playerLabel = g_ui.createWidget('SpellsButton', uiList)
  playerLabel.clickButton:setText(spells[i].name)
  playerLabel.icon:setPercent(spells[i].cooldown)
      playerLabel.onClick = function(widget)
      local protocolGame = g_game.getProtocolGame()
      if protocolGame then
        scheduleEvent(function() g_game.talk(spells[i].words) end, 100)
        protocolGame:sendExtendedOpcode(108, json.encode({action = "cast", data = spells[i].words}))
      end
     end
 end
end

function toggle()
    local protocolGame = g_game.getProtocolGame()
    if protocolGame then
        protocolGame:sendExtendedOpcode(108, json.encode({action = "refresh"}))
    end
  if spellscasterButton:isOn() then
    spellscasterWindow:close()
    spellscasterButton:setOn(false)
  else
    spellscasterWindow:open()
    spellscasterButton:setOn(true)
  end
end

Originally I didn't have the JSON.lua and such but browsing everything I found Oen's post regarding it and added them in the correct places on server and client, and set those up..
The error I get when running this script in terminal on client is as follows;

ERROR: protected lua call failed: LUA ERROR:
/spells_caster/spellscaster.lua:61: attempt to get length of global 'spells' (a nil value)
stack traceback:
    [C]: in function '__len'
    /spells_caster/spellscaster.lua:61: in function </spells_caster/spellscaster.lua:57

Maybe the JSON is communicating? Possibly something else at fault? I am unsure on how to proceed, any help is appreciated.

 

[Fischturd]

Disregard