Smart and Autonomous parking.
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#Authors: Oulis Evangelos, Oulis Nikolaos, Drosos Katsibras
#===================================================================
#!/usr/bin/env python
import time
import serial
import requests
import json
# Open file to configure communication with server.
with open('/home/pi/project/data.json', 'r') as json_file:
json_data = json_file.read()
if json_data != "" and json_data != None:
server_par = json.loads(json_data.replace('\n','').replace(' ',''))
# Initialize server IP and Port to make the connection.
server_ip = server_par['ip']
server_port = server_par['port']
if server_ip != None and server_port != None:
API_ENDPOINT = 'http://' + server_ip + ':' + server_port + '/parkingStatus'
# Initialize Serial Connection with Arduino Uno
ser = serial.Serial(
port='/dev/ttyACM0',
baudrate = 9600,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
bytesize=serial.EIGHTBITS,
timeout=1
)
counter=0
ser.readline()
prev_status = "-1"
# Authentication body content.
data = """{"username" :""" + server_par['username'] + """, "password":""" + server_par['password'] + """, "device": """ + server_par['device'] + """}"""
# Request to Authenticate Node.
resp = requests.post(url = API_ENDPOINT, data = data)
# Unpack our data to a JSON object
data = json.loads(resp.content)
try:
# Check if node is Authenticated. "cookie
if data['cookie'] != None:
cookie = data['cookie']
while 1:
# For a while we request to get Parking Status
# witch is a JSON object like [{"no": 1, "status": false}, {"no": 2, "status": true}, ..., {"no": n, "status": true}]
park_status = ser.readline()
# Substring the input data from arduino.
# Data's notation is: <parking_no>#<parking_status>
park_status_data = str(park_status).split("#")
# Decode and clear serial input data encoding.
parkingCode = park_status_data[0].replace('b\'','')
parkingStatus = park_status_data[1].replace('\\r\\n\'', '')
try:
if parkingStatus != prev_status:
# If parking status changed from previous status
# server would informed about this change.
data = """{"no":""" + parkingCode + ""","status":""" + parkingStatus + """, "cookie": \"""" + cookie + """\"}"""
r = requests.post(url = API_ENDPOINT, data = data)
# IO : node prints to output the current
if parkingStatus == "0":
print("parking reserved. RESPONSE :", r.status_code, "\n")
elif parkingStatus == "1":
print("parking not reserved. RESPONSE : ", r.status_code, "\n")
except NameError as e:
print("**Not already prev variable. <Error> : ", str(e), "\n")
prev_status = parkingStatus
except TypeError as e:
print("Node must be authenticate first.")
else:
print("Create a *.json configuration like: {'ip' : 'xxx.xxx.xxx.xxx', 'port': 'xxxx'}")