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subscribe.py
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subscribe.py
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import os
import sys
import paho.mqtt.subscribe as subscribe
from dotenv import load_dotenv
import json
import time
import signal
import pymongo
from pymongo import MongoClient
import urllib.request
import urllib.error
def wait_for_internet_connection():
"""Waits for the internet connection"""
success_2xx = [200, 201, 202, 203, 204]
print("Checking for the internet connection.")
# Checks for program interruption
signal.signal(signal.SIGINT, handler)
while True:
try:
response = urllib.request.urlopen("https://google.com", timeout=1)
if response.status in success_2xx:
print("Internet connection established.")
return
except urllib.error.URLError:
print("\nAn error occurred. Trying again.")
pass
def handler(signum, frame):
"""Cleanly exits the code"""
res = input("\nCtrl+c was pressed. Do you want to exit? (y/n): ")
if res.lower() == 'y':
exit(1)
def main():
load_dotenv()
try:
# TTN MQTT username and password
mqtt_username = os.environ.get("mqtt_username")
mqtt_password = os.environ.get("mqtt_password")
# MongoDB username and password
mongodb_username = os.environ.get("mongodb_username")
mongodb_password = os.environ.get("mongodb_password")
database_name = os.environ.get("database_name")
collection_name = os.environ.get("collection_name")
except:
sys.exit("\nEnvironment variables not found.")
# Check if the internet is connected
try:
# Connecting to MongoDB
print("Connecting database.")
connection = f"mongodb+srv://{mongodb_username}:{mongodb_password}@cluster0.bzwch.mongodb.net/{database_name}?retryWrites=true&w=majority"
client = MongoClient(connection)
print("Succesfully connected to the database.")
except:
sys.exit("Could not connect to MongoDB. Check for valid credentials.")
# Getting a database
db = client[database_name]
signal.signal(signal.SIGINT, handler)
# Runs the programm unless interrupted
while True:
# Waits for an uplink and then proceeds once the message is received
m = subscribe.simple(topics=['#'],
hostname="au1.cloud.thethings.network",
port=1883,
auth={'username':mqtt_username,'password':mqtt_password})
# Converts the binary to a string
message = m.payload.decode("UTF-8")
# Converts the payload into json object
payload = json.loads(message)
# Creating a collection to store the raw data from the uplinks on TTN
uplinks = db[collection_name]
# Inserting the data in the collection
uplinks.insert_one(payload)
# Extracting time
try:
uplink_timestamp = payload["received_at"]
except:
uplink_timestamp = ""
# Extracting device id information
try:
device_id = payload["end_device_ids"]["device_id"]
except:
device_id = ""
# Output timestamp and device id
print(f"{uplink_timestamp}:{device_id}")
wait_for_internet_connection()
main()