F10.6 The internet, DNS and the cloud

Two robots are on the mat: scout.bot and rover.bot. Look up scout.bot with the DNS robot, then take the IP address from its reply. Send to <address>: where and the Scout answers at <x>,<y>. Drive to about 13 cm in front of it, into the green square, without touching anything. The helpers ask, numbers_in, go_to and near are ready to use.

# the two lines every program starts with: the commands, then the robot
from bugbot import *
connect()
import math

def ask(question, seconds=1.0):
    # send a question and return the first reply that arrives within `seconds`, or None
    send(question)
    for tick in range(int(seconds * 10)):
        wait(0.1)
        for sender, text in messages():
            return text
    return None

def numbers_in(text):
    # every number in a message, as floats: "at 25,55" -> [25.0, 55.0]
    out = []
    for word in text.replace(",", " ").split():
        try:
            out.append(float(word))
        except ValueError:
            pass
    return out

def wrapped(h):
    return (h + 180) % 360 - 180

def go_to(x, y, speed=60):
    # one step of driving towards (x, y), measured from the start; call it in a loop
    px, py = position()
    a = math.radians(wrapped(math.degrees(math.atan2(x - px, y - py)) - heading()))
    drive(speed * math.cos(a), speed * math.sin(a), wrapped(0 - heading()) * 3)

def near(x, y, cm=4):
    px, py = position()
    return math.hypot(x - px, y - py) < cm

Plan your program here, then type it in and press Run.

Do it on the robot
www.bugbotlab.com/learn/f10-6-the-internet-dns-and-the-cloud/
The simulator checks it and tells you when it passes. Nothing to install, no account.