receive_dig.lua

local component = require("component")
local event = require("event")
local shell = require("shell")
local modem = component.modem

local PORT = 10001

modem.open(PORT)

function receive()
    print("Waiting for command on port " .. PORT)
    local _, _, sender, port, distance, msg = event.pull("modem_message")
    local length = tonumber(msg)
    print("Got request to execute length of " .. length .. " from " .. sender)
    shell.execute("fillLine minecraft:dirt 0 " .. length)
    print("Done!")
end

while true do
    receive()
end