Viewer

-- Function to find the side where the Ender Modem is located
local function findModemSide()
    local sides = {"top", "bottom", "left", "right", "front", "back"}
    for _, side in ipairs(sides) do
        if peripheral.isPresent(side) and peripheral.getType(side) == "modem" then
            return side
        end
    end
    return nil  -- No Ender Modem found
end

-- Attempt to open Rednet on the detected modem side
local function openRednet()
    local modemSide = findModemSide()
    if modemSide then
        local success = rednet.open(modemSide)
        if not success then
            print("Failed to open Rednet on side:", modemSide)
            return false
        end
        print("Rednet opened successfully on side:", modemSide)
        return true
    else
        print("No Ender Modem detected.")
        return false
    end
end

if not openRednet() then
    return  -- Exit if no Ender Modem is found
end

while true do
    local senderID, message = rednet.receive()

    -- Check if the message is from a computer and contains screen content
    if type(message) == "table" and message.screenContent then
        term.clear()
        term.setCursorPos(1, 1)
        for y = 1, #message.screenContent do
            for x = 1, #message.screenContent[y] do
                local textColor = message.screenContent[y][x][1]
                local bgColor = message.screenContent[y][x][2]

                -- Ensure valid color codes
                if term.isColor() then
                    textColor = textColor % 16 -- limit to valid color range
                    bgColor = bgColor % 16 -- limit to valid color range
                else
                    textColor = 1 -- default to white for non-color displays
                    bgColor = 32768 -- default to black for non-color displays
                end

                term.setTextColor(textColor)
                term.setBackgroundColor(bgColor)
                term.write(" ")
            end
            print() -- Move to next line
        end
    else
        print("Received invalid message format from", senderID)
    end
end