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368 lines
16 KiB
368 lines
16 KiB
import socket
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import re
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from flask import Flask, request, jsonify
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from twilio.rest import Client
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import time
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import threading
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app = Flask(__name__)
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# Set this variable to enable/disable private mode
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private_mode = False # Change this value as needed
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# List of callsigns allowed to send messages if private_mode is TRUE. Accepts ALL SSIDs for a CALLSIGN listed.
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allowed_callsigns = ['CALLSIGN0', 'CALLSIGN1', 'CALLSIGN2'] # Add more callsigns as needed
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# Twilio credentials
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TWILIO_ACCOUNT_SID = 'SID'
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TWILIO_AUTH_TOKEN = 'TOKEN'
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TWILIO_PHONE_NUMBER = '+NUMBER' # Your Twilio phone number
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# APRS credentials
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APRS_CALLSIGN = 'CALL'
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APRS_PASSCODE = 'PASS'
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APRS_SERVER = 'rotate.aprs2.net'
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APRS_PORT = 14580
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# Initialize the socket
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aprs_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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# Declare socket_ready as a global variable
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socket_ready = False
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# Dictionary to store the last received APRS message ID for each user
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user_last_message_id = {}
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processed_message_ids = set()
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# Outside the main loop, initialize a dictionary to store message history
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received_aprs_messages = {}
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received_acks = {}
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RETRY_INTERVAL = 90 # Adjust this as needed
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MAX_RETRIES = 4 # Adjust this as needed
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def send_ack_message(sender, message_id):
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ack_message = 'ack{}'.format(message_id)
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sender_length = len(sender)
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spaces_after_sender = ' ' * max(0, 9 - sender_length)
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ack_packet_format = '{}>APRS::{}{}:{}\r\n'.format(APRS_CALLSIGN, sender, spaces_after_sender, ack_message)
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ack_packet = ack_packet_format.encode()
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aprs_socket.sendall(ack_packet)
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print("Sent ACK to {}: {}".format(sender, ack_message))
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print("Outgoing ACK packet: {}".format(ack_packet.decode()))
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def send_rej_message(sender, message_id):
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rej_message = 'rej{}'.format(message_id)
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sender_length = len(sender)
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spaces_after_sender = ' ' * max(0, 9 - sender_length)
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rej_packet_format = '{}>APRS::{}{}:{}\r\n'.format(APRS_CALLSIGN, sender, spaces_after_sender, rej_message)
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rej_packet = rej_packet_format.encode()
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aprs_socket.sendall(rej_packet)
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print("Sent REJ to {}: {}".format(sender, rej_message))
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print("Outgoing REJ packet: {}".format(rej_packet.decode()))
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def send_sms(twilio_phone_number, to_phone_number, from_callsign, body_message):
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# Initialize the Twilio client
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client = Client(TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN)
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try:
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# Send SMS using the Twilio API
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message = client.messages.create(
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body="@{} {}".format(from_callsign, body_message),
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from_=twilio_phone_number,
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to=to_phone_number
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)
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print("SMS sent successfully.")
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print("SMS SID:", message.sid)
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except Exception as e:
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print("Error sending SMS:", str(e))
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def format_aprs_packet(callsign, message):
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sender_length = len(callsign)
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spaces_after_sender = ' ' * max(0, 9 - sender_length)
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aprs_packet_format = '{}>APRS::{}{}:{}\r\n'.format(APRS_CALLSIGN, callsign, spaces_after_sender, message)
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return aprs_packet_format
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# Dictionary to store the mapping of aliases (callsigns) to phone numbers
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alias_map = {
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'alias1': '123456789', # Replace 'alias1' with the desired alias and '1234567890' with the corresponding phone number.
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'alias2': '9876543210', # Add more entries as needed for other aliases and phone numbers.
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# Add more entries as needed.
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}
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def find_phone_number_from_alias(alias):
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return alias_map.get(alias.lower())
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# Create a new dictionary to store the reverse mapping of phone numbers to aliases
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reverse_alias_map = {v: k for k, v in alias_map.items()}
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@app.route('/sms', methods=['POST'])
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def receive_sms():
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# Parse the incoming SMS message
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data = request.form
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from_phone_number = data['From']
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body_message = data['Body']
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# If the message is in the correct format, the function extracts the callsign and APRS message content from the SMS body.
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if body_message.startswith('@'):
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parts = body_message.split(' ', 1)
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if len(parts) == 2:
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# Extract the 10-digit phone number from the sender's phone number
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sender_phone_number = from_phone_number[-10:]
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callsign = parts[0][1:].upper() #Convert to UPPERCASE
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aprs_message = parts[1]
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# Get the last APRS message ID sent to this user
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last_message_id = user_last_message_id.get(from_phone_number, 0)
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# Increment the message ID to avoid duplicate messages
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last_message_id += 1
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user_last_message_id[from_phone_number] = last_message_id
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# Use the reverse alias mapping to check if the sender's phone number has an associated alias
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alias = reverse_alias_map.get(sender_phone_number.lower())
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if alias:
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sender_phone_number = alias
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# If an alias is found, use it; otherwise, use the phone number itself as the alias
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if alias:
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sender_phone_number = alias
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# Format the APRS packet and send it to the APRS server
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aprs_packet = format_aprs_packet(callsign, "@{} {}".format(sender_phone_number, aprs_message + "{" + str(last_message_id)))
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aprs_socket.sendall(aprs_packet.encode())
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#print(user_last_message_id)
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#print(last_message_id)
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print("Sent APRS message to {}: {}".format(callsign, aprs_message))
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print("Outgoing APRS packet: {}".format(aprs_packet.strip()))
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time.sleep(5) # Sleeping here allows time for incoming ack before retry
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# Retry sending the message if ACK is not received
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retry_count = 0
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ack_received = False # Flag to track whether ACK is received
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while retry_count < MAX_RETRIES and not ack_received:
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if str(last_message_id) in received_acks.get(callsign, set()):
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print("Message ACK received. No further retries needed.")
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ack_received = True
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# Reset retry count and remove the ACK ID
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retry_count = 0
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received_acks.get(callsign, set()).discard(str(last_message_id))
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else:
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print("ACK not received. Retrying in {} seconds.".format(RETRY_INTERVAL))
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aprs_socket.sendall(aprs_packet.encode())
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retry_count += 1
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time.sleep(RETRY_INTERVAL) # Pause for the defined interval
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if ack_received:
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print("ACK received during retries. No further retries needed.")
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elif retry_count >= MAX_RETRIES:
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print("Max retries reached. No ACK received for the message.")
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return jsonify({'status': 'success'})
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else:
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return jsonify({'status': 'error', 'message': 'Invalid SMS format'})
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else:
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return jsonify({'status': 'error', 'message': 'SMS does not start with "@" symbol'})
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def receive_aprs_messages():
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global socket_ready # Declare that you're using the global variable
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# Connect to the APRS server
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aprs_socket.connect((APRS_SERVER, APRS_PORT))
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print("Connected to APRS server with callsign: {}".format(APRS_CALLSIGN))
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# Send login information with APRS callsign and passcode
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login_str = 'user {} pass {} vers SMS-Gateway 0.1b\r\n'.format(APRS_CALLSIGN, APRS_PASSCODE)
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aprs_socket.sendall(login_str.encode())
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print("Sent login information.")
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# Set the socket_ready flag to indicate that the socket is ready for keepalives
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socket_ready = True
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buffer = ""
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try:
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while True:
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data = aprs_socket.recv(1024)
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print (data)
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if not data:
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break
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# Add received data to the buffer
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buffer += data.decode()
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# Split buffer into lines
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lines = buffer.split('\n')
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# Process each line
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for line in lines[:-1]:
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if line.startswith('#'):
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continue
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# Process APRS message
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print("Received raw APRS packet: {}".format(line.strip()))
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parts = line.strip().split(':')
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if len(parts) >= 2:
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from_callsign = parts[0].split('>')[0].strip()
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message_text = ':'.join(parts[1:]).strip()
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# Extract and process ACK ID if present
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if "ack" in message_text:
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parts = message_text.split("ack", 1)
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if len(parts) == 2 and parts[1].isdigit():
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ack_id = parts[1]
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process_ack_id(from_callsign, ack_id)
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# End RXd ACK ID for MSG Retries
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# Check if the message contains "{"
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if "{" in message_text:
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message_id = message_text.split('{')[1].strip('}')
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# Remove the first 11 characters from the message to exclude the "Callsign :" prefix
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verbose_message = message_text[11:].split('{')[0].strip()
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# Inside the receive_aprs_messages function
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if private_mode:
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# Use regular expression to match main callsign and accept all SSIDs
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callsign_pattern = re.compile(r'^({})(-\d+)?$'.format('|'.join(map(re.escape, allowed_callsigns))))
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if not callsign_pattern.match(from_callsign):
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print("Unauthorized sender:", from_callsign)
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send_rej_message(from_callsign, message_id)
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continue # Skip processing messages from unauthorized senders
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# Display verbose message content
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print("From: {}".format(from_callsign))
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print("Message: {}".format(verbose_message))
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print("Message ID: {}".format(message_id))
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print(user_last_message_id)
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# Check if the verbose message contains the desired format with a number or an alias
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pattern = r'@(\d{10}|\w+) (.+)'
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match = re.match(pattern, verbose_message)
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# Send ACK
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send_ack_message(from_callsign, message_id)
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if match:
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recipient = match.group(1)
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aprs_message = match.group(2)
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# Check if the recipient is a 10-digit number or an alias
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if recipient.isdigit():
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# Recipient is a 10-digit number
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phone_number = recipient
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else:
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# Recipient is an alias
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phone_number = find_phone_number_from_alias(recipient)
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if phone_number:
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# Get the last APRS message ID sent to this user
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last_message_id = user_last_message_id.get(from_callsign, 0)
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last_message_id += 1
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user_last_message_id[from_callsign] = last_message_id
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else:
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print("Recipient not found in alias map or not a 10-digit number: {}".format(recipient))
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# Check for duplicate messages
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if (aprs_message, message_id) in received_aprs_messages.get(from_callsign, set()):
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print("Duplicate message detected. Skipping SMS sending.")
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send_ack_message(from_callsign, message_id)
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else:
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# Mark the message as received
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received_aprs_messages.setdefault(from_callsign, set()).add((aprs_message, message_id))
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# Send SMS
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send_sms(TWILIO_PHONE_NUMBER, phone_number, from_callsign, aprs_message)
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# Add this line to mark the message ID as processed
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processed_message_ids.add(message_id)
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# Extract and process ACK ID if present
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if message_text.startswith("ack"):
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ack_id = message_text[3:] # Remove the "ack" prefix
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process_ack_id(from_callsign, ack_id)
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pass
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# Send ACK
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# The last line might be an incomplete packet, so keep it in the buffer
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buffer = lines[-1]
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except Exception as e:
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print("Error receiving APRS messages: {}".format(e))
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finally:
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# Close the socket connection when done
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aprs_socket.close()
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#Implementation for ack check with Message Retries #TODO
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def process_ack_id(from_callsign, ack_id):
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print("Received ACK from {}: {}".format(from_callsign, ack_id))
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received_acks.setdefault(from_callsign, set()).add(ack_id)
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# Update your records or take any other necessary action
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def send_keepalive():
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global socket_ready # Declare that you're using the global variable
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while True:
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try:
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if socket_ready:
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# Send a keepalive packet to the APRS server
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keepalive_packet = '#\r\n'
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aprs_socket.sendall(keepalive_packet.encode())
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print("Sent keepalive packet.")
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except Exception as e:
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print("Error sending keepalive:", str(e))
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time.sleep(30) # Send keepalive every 30 seconds
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def send_beacon():
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global socket_ready # Declare that you're using the global variable
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while True:
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try:
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if socket_ready:
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# Send a keepalive packet to the APRS server
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keepalive_packet = 'SMS>NA7Q:!4024.51N/14943.02W$Bidirectional SMS Gateway (BETA)(US ONLY) - NA7Q\r\n'
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aprs_socket.sendall(keepalive_packet.encode())
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print("Sent Beacon Packet.")
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except Exception as e:
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print("Error sending beacon:", str(e))
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time.sleep(601) # Send keepalive every 10 minutes
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if __name__ == '__main__':
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print("APRS bot is running. Waiting for APRS messages...")
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# Start a separate thread for sending keepalive packets
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keepalive_thread = threading.Thread(target=send_keepalive)
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keepalive_thread.start()
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# Start a separate thread for sending keepalive packets
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beacon_thread = threading.Thread(target=send_beacon)
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beacon_thread.start()
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# Run the Flask web application in a separate thread to handle incoming SMS messages
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from threading import Thread
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webhook_thread = Thread(target=app.run, kwargs={'host': '0.0.0.0', 'port': 5000})
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webhook_thread.start()
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# Start listening for APRS messages
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receive_aprs_messages()
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