Python shell to control an ESP8266 car

esp_car.py

#!/usr/bin/python -i

import os
import atexit
import readline
import rlcompleter
import requests
import time

DEBUG = False

ESP_CAR_URL = 'http://192.168.4.1'

DIR_LEFT = 1
DIR_RIGHT = 2
DIR_REVERSE = 3
DIR_FORWARD = 4
DIR_STOP = 5

SLOW = 512
MEDIUM = 768
FAST = 1024


## History and autocomplete

historyPath = os.path.expanduser("~/.espcar-history")

readline.parse_and_bind('tab: complete')

def save_history(historyPath=historyPath):
    readline.write_history_file(historyPath)

if os.path.exists(historyPath):
    readline.read_history_file(historyPath)

atexit.register(save_history)


## ESP-CAR functions

def move(direction, speed, ms=None):
    params = {'dir': direction, 'speed': speed}
    r = requests.get(ESP_CAR_URL, params=params)
    if DEBUG:
        print(r.url)
    if ms is not None:
        time.sleep(ms / 1000.0)

def right(speed, ms=None):
    move(DIR_RIGHT, speed, ms)

def left(speed, ms=None):
    move(DIR_LEFT, speed, ms)

def forward(speed, ms=None):
    move(DIR_FORWARD, speed, ms)

def reverse(speed, ms=None):
    move(DIR_REVERSE, speed, ms)

def stop():
    move(DIR_STOP, 0, None)

def demo():
    forward(FAST, 1000)
    right(FAST, 100)
    forward(FAST, 500)
    forward(MEDIUM, 500)
    forward(SLOW, 500)
    stop()
    reverse(FAST, 1000)
    right(FAST, 100)
    forward(FAST, 1000)
    left(FAST, 1000)
    stop()


print """
Welcome to esp-car shell
Autocompletion and history are enabled

Functions: 
    demo()
    forward(velocity, ms)
    reverse(velocity, ms)
    left(velocity, ms)
    right(velocity, ms)
    stop()

Velocity: FAST, MEDIUM, SLOW
"""