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