InvSensor

-- load the API
os.loadAPI("ocs/apis/sensor")
-- wrap the sensor
local invSensor = sensor.wrap("left")
modem = peripheral.wrap("top")
modem.setDefaultChannel(1)
modem.setListening(1,true)
local inBounds = function(position)
    if position.X <= 4 and position.X >= -4 and
    position.Z <= 3 and position.Z >= -1 and
    position.Y <= -1 and position.Y >= -4 then
return true
else
return false
end
end

local convName = function(name)
    name = name:lower()
    name = name:gsub(" ", "_")
    name = name:gsub('%(', "")
    name = name:gsub('%)', "")
    return name
end

local getInventory = function()
    local targets = invSensor.getTargets()
    local inventory={}
    for k,v in pairs(targets) do
        local position = v.Position
        if inBounds(position) then
            local details = invSensor.getTargetDetails(k)
            for i,v in pairs(details.Slots) do
        if v.Name == "" then
            name = v.RawName
            else
                name = convName(v.Name)
        end
                if name == "empty" then
                    name = "_"
                    if inventory[name] == nil then
                        inventory[name] = 0
                    end
                    inventory[name] = inventory[name] + 64
        else
                    if inventory[name] == nil then
                        inventory[name] = 0
                    end
                    inventory[name] = inventory[name] + v.Size
                end
            end
        end
    end
    return inventory
end

local netListen = function()
    local msg = {Command = nil, Payload = nil}
    local id
    while true do
        local event,side,id,channel,srmsg = os.pullEvent("lan_message")
        local msg = textutils.unserialize(srmsg)
        if type(msg) == "table" then
            print(msg.Command)
            if msg.Command == "invDisplay.reportReq" then
                local storage = getInventory()
                local reply = {Command = "invSensor.report",Payload = {Inventory = storage}}
                reply = textutils.serialize(reply)
                modem.send(reply)
            end
        end
    end
end


netListen()