Modem Checker

-- Check if there is a modem on the left side
local side = "left"
local modem = peripheral.wrap(side)

if modem == nil then
    -- No modem found on the left side
    print("Error: No modem found on the left side of the device.")
else
    -- Modem found on the left side
    print("Modem detected on the left side of the device.")
end