-- Function to check for a modem and open Rednet
local function setupRednet()
    local modemSide = nil
    for _, side in ipairs({"left", "right", "top", "bottom", "front", "back"}) do
        if peripheral.getType(side) == "modem" then
            modemSide = side
            break
        end
    end

    if modemSide then
        rednet.open(modemSide)  -- Open the modem on the detected side
        return true
    else
        print("No modem detected.")
        return false
    end
end

local function sendCommand(command)
    rednet.broadcast(command)
    print("Command sent: " .. command)
end

-- Initialize
if setupRednet() then  -- Check for modem and open Rednet
    -- Command input loop
    while true do
        print("Enter command (forward, backward, load, quit): ")
        local input = read()
        if input == "quit" then
            sendCommand("quit")
            break
        else
            sendCommand(input)
        end
    end
else
    print("Exiting program.")
end

rednet.close("left")  -- Close the modem