2018-01-07 14:09:40 +01:00
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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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"""!
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____ ____ ______ __ __ __ _____
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/ __ )/ __ \/ ___/ | / /___ _/ /______/ /_ |__ /
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/ __ / / / /\__ \| | /| / / __ `/ __/ ___/ __ \ /_ <
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/ /_/ / /_/ /___/ /| |/ |/ / /_/ / /_/ /__/ / / / ___/ /
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/_____/\____//____/ |__/|__/\__,_/\__/\___/_/ /_/ /____/
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German BOS Information Script
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by Bastian Schroll
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@file: pocsag.py
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@date: 06.01.2018
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@author: Bastian Schroll
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@description: Decoder class for pocsag
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"""
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import logging
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import re
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from boswatch.packet import packet
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logging.debug("- %s loaded", __name__)
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2018-09-09 16:17:49 +02:00
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class PocsagDecoder:
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2018-01-07 14:09:40 +01:00
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"""!POCSAG decoder class
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This class decodes POCSAG data.
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2018-02-03 22:32:28 +01:00
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First step is to validate the data and _check if the format is correct.
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2018-01-07 14:09:40 +01:00
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In the last step a valid BOSWatch packet is created and returned"""
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def __init__(self):
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"""!Create a new instance"""
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logging.debug("POCSAG decoder started")
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2018-01-08 07:56:10 +01:00
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@staticmethod
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2018-01-08 07:58:33 +01:00
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def decode(data):
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2018-01-07 14:09:40 +01:00
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"""!Decodes POCSAG
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@param data: POCSAG for decoding
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@return BOSWatch POCSAG packet or None"""
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2018-09-09 16:17:49 +02:00
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bitrate, ric, subric = PocsagDecoder._getBitrateRicSubric(data)
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2018-01-07 14:09:40 +01:00
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2018-01-08 08:09:23 +01:00
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if re.search("[0-9]{7}", ric) and re.search("[1-4]", subric):
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2018-01-07 14:09:40 +01:00
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if "Alpha:" in data:
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message = data.split('Alpha: ')[1].strip()
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2018-01-08 08:09:23 +01:00
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message = message.replace('<NUL>', '').replace('<NUL', '').replace('< NUL>', '').replace('<EOT>', '').strip()
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2018-01-07 14:09:40 +01:00
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else:
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message = ""
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subricText = subric.replace("1", "a").replace("2", "b").replace("3", "c").replace("4", "d")
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logging.debug("found valid POCSAG")
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bwPacket = packet.Packet()
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2018-01-09 11:33:23 +01:00
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bwPacket.set("mode", "pocsag")
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bwPacket.set("bitrate", bitrate)
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bwPacket.set("ric", ric)
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bwPacket.set("subric", subric)
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bwPacket.set("subricText", subricText)
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bwPacket.set("message", message)
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2018-01-07 14:09:40 +01:00
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logging.debug(bwPacket)
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return bwPacket
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logging.warning("no valid data")
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return None
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2018-01-08 07:56:10 +01:00
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@staticmethod
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def _getBitrateRicSubric(data):
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"""!Gets the Bitrate, Ric and Subric from data
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@param data: POCSAG data string
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@return bitrate
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@return ric
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@return subric"""
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bitrate, ric, subric = 0, 0, 0
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if "POCSAG512:" in data:
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bitrate = 512
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ric = data[20:27].replace(" ", "").zfill(7)
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subric = str(int(data[39]) + 1)
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elif "POCSAG1200:" in data:
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bitrate = 1200
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ric = data[21:28].replace(" ", "").zfill(7)
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subric = str(int(data[40]) + 1)
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elif "POCSAG2400:" in data:
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bitrate = 2400
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ric = data[21:28].replace(" ", "").zfill(7)
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subric = str(int(data[40]) + 1)
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return bitrate, ric, subric
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