istrain
559caead36
Public community release. The complete working system — DSP + decoders (scripts/), web dashboard + API (dashboard/), container stack (docker/), config templates (config/) — plus APOCALYPSE-EDITION.md, the full build guide for a human or a coding agent. GPLv3 (PyEOT dependency). Scrubbed of all secrets, internal IPs, hostnames, and location detail. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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PyEOT End-of-Train Device Decoder
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Copyright (c) 2018 Eric Reuter
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This source file is subject of the GNU general public license.
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history: 2018-08-09 Initial Version
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purpose: Class to parse EOT packet and generate BCH checkbits
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for verification.
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Requires helpers.py
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"""
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import helpers
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class EOT_decode():
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def __init__(self, buffer):
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self.packet = buffer[0:74]
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self.frame_sync = self.packet[0:11]
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self.data_block = self.packet[11:56]
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self.batt_cond = (self.packet[13:15][::-1])
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self.message_type = self.packet[15:18]
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self.unit_addr = int((self.packet[18:35][::-1]), 2)
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self.pressure = int((self.packet[35:42][::-1]), 2)
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self.batt_charge = \
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("{}%".format(int(int((self.packet[42:49][::-1]), 2) / 127 * 100)))
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self.spare = self.packet[49]
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self.valve_ckt_stat = self.packet[50]
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self.conf_ind = self.packet[51]
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self.turbine = self.packet[52]
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self.motion = self.packet[53]
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self.mkr_batt = self.packet[54]
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self.mkr_light = self.packet[55]
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self.checkbitsRx = self.packet[56:74]
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self.batt_cond_dict = {"11": "OK",
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"10": "Low",
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"01": "Very Low",
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"00": "Not Monitored"}
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self.batt_cond_text = self.batt_cond_dict[self.batt_cond]
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if (self.message_type == "111"):
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if (self.conf_ind == "0"):
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self.arm_status = "Arming"
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else:
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self.arm_status = "Armed"
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else:
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self.arm_status = "Normal"
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self.generator = '1111001101000001111' # BCH generator polynomial
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self.cipher_key = '101011011101110000' # XOR cipher key
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self.data_block = helpers.reverse(self.data_block)
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self.checkbits = helpers.checkbits(self.data_block, self.generator)
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self.checkbits_cipher = helpers.xor(self.checkbits, self.cipher_key)
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self.valid = (self.checkbits_cipher == self.checkbitsRx) # a match?
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def get_packet(self):
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return ''.join(self.packet)
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