GraviNet Setup

local w, h = term.getSize()

function printCentered(text, y)
    term.setCursorPos(w/2 - #text/2, y)
    term.write(text)
end

term.clear()

term.setCursorPos(1, 1)
print(string.rep("-", w))
printCentered("Welcome to the GraviNet Setup wizard.", 2)
printCentered("This wizard will guide you", 3)
printCentered("through connecting to GraviNet.", 4)
print(string.rep("-", w))
os.sleep(0.5)
print("\n")
print("Which side is your modem on?")
print("[top, bottom, back, front, left, right]")
local side = read()
print("Modem at side: "..side)
os.sleep(0.5)
print("Attempting to connect to GraviNet, please wait.")

rednet.open(side)
rednet.broadcast("$HELLO")
local id, message

while true do
    id, message = rednet.receive(5)
    if not message then
        error("No network routers nearby, couldn't connect to GraviNet.")
        return
    end

    if message == "$HELLO" then break end
end

print("A network has been located!")

rednet.send(id, "$ADDME")
while true do
    id, message = rednet.receive(5)

    if not message then
        error("Connecting failed... Network did not accept your computer.")
        return
    end
    if message == "$ACK" then break end
end

print("Succesfully connected to GraviNet. Updating your preferences...")
local pref = fs.open("gravinet/client/pref", "w")
pref.write(textutils.serialise({
    routerId = id,
    side = side
}))
pref.close()

os.sleep(0.5)
term.clear()
term.setCursorPos(1,1)
print("A preference file has been created in the directory gravinet/pref . Do not delete this file!")
os.sleep(0.5)
print("Connection to network succesful, shutting down wizard...")
os.sleep(1)
rednet.close(side)
term.clear()
term.setCursorPos(1,1)