io.write("Enter server port: ")
SERVER_PORT = tonumber(io.read())
io.write("Enter client port: ")
CLIENT_PORT = tonumber(io.read())

local modem = peripheral.find("modem")
modem.open(CLIENT_PORT)

modem.transmit(SERVER_PORT, CLIENT_PORT, "connectMessage")

while true do

    x, y, z = gps.locate(5)

    event, modemSide, senderChannel, replyChannel, message, distance = os.pullEvent("modem_message")
    if message == "connectSuccess" then
        print("Connected to "..replyChannel)
    elseif message == "pingLoc" then
        print("I have been pinged")
        modem.transmit(replyChannel, replyChannel, "I am at (" .. x .. ", " .. z .. ", " .. y .. ")")
    end
end