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#!/usr/bin/env python |
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|
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# |
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# (C) Copyright 2020 Max H. Parke, KA1RBI |
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# |
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# This file is part of OP25 |
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# |
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# OP25 is free software; you can redistribute it and/or modify it |
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# under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 3, or (at your option) |
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# any later version. |
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# |
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# OP25 is distributed in the hope that it will be useful, but WITHOUT |
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
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# License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with OP25; see the file COPYING. If not, write to the Free |
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# Software Foundation, Inc., 51 Franklin Street, Boston, MA |
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# 02110-1301, USA. |
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|
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# |
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# nxdn trunking: |
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# - CAC decoding |
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# |
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|
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import sys |
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import os |
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sys.path.append('tdma') |
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from bit_utils import * |
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|
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def locid(id): |
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save_id = mk_int(id) |
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cat = mk_int(id[:2]) |
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if cat == 0: |
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ssize = 10 |
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elif cat == 2: |
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ssize = 14 |
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elif cat == 1: |
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ssize = 17 |
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else: |
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return {'category': -1, 'system': -1, 'site': -1, 'id': '0x%x' % save_id} |
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id = id[2:] |
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syscode = mk_int(id[:ssize]) |
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id = id[ssize:] |
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sitecode = mk_int(id) |
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return {'category': cat, 'system': syscode, 'site': sitecode, 'id': '0x%x' % save_id} |
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|
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def mk_freq(f): |
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### todo: UHF currently untested; may fail at 400 MHz |
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return int(f * 1250 + 100000000) # frequency in Hz |
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|
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def cac_message(s): |
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d = {} |
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bits = [] |
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for c in s: |
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for i in range(8): |
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bits.append((c >> (7-i)) & 1) |
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d['structure'] = mk_int(bits[:2]) |
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d['ran'] = mk_int(bits[2:8]) |
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bits = bits[8:] |
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msg_type = mk_int(bits[2:8]) |
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d['msg_typeid'] = msg_type |
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if msg_type == 0x18: # SITE_INFO |
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assert len(bits) == 144 |
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d['msg_type'] = 'SITE_INFO' |
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bits = bits[8:] |
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d['location_id'] = locid(bits[:24]) |
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bits = bits[24:] |
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d['channel_info'] = mk_int(bits[:16]) |
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bits = bits[16:] |
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d['service_info'] = mk_int(bits[:16]) |
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bits = bits[16:] |
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d['restr_info'] = mk_int(bits[:24]) |
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bits = bits[24:] |
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d['access_info'] = mk_int(bits[:24]) |
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bits = bits[24:] |
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d['version_no'] = mk_int(bits[:8]) |
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bits = bits[8:] |
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d['adjacent_alloc'] = mk_int(bits[:4]) |
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bits = bits[4:] |
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d['cc1'] = mk_int(bits[:10]) |
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bits = bits[10:] |
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d['cc2'] = mk_int(bits[:10]) |
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elif msg_type == 0x19: # SRV_INFO |
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assert len(bits) >= 72 |
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d['msg_type'] = 'SRV_INFO' |
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bits = bits[8:] |
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d['location_id'] = locid(bits[:24]) |
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bits = bits[24:] |
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d['service_info'] = mk_int(bits[:16]) |
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bits = bits[16:] |
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d['restr_info'] = mk_int(bits[:24]) |
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elif msg_type == 0x1a: # CCH_INFO |
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assert len(bits) >= 72 |
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d['msg_type'] = 'CCH_INFO' |
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bits = bits[8:] |
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d['location_id'] = locid(bits[:24]) |
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bits = bits[24:] |
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d['flags1'] = mk_int(bits[:8]) |
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bits = bits[8:] |
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d['cc1'] = mk_freq(mk_int(bits[:16])) |
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bits = bits[16:] |
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d['cc2'] = mk_freq(mk_int(bits[:16])) |
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elif msg_type == 0x1b: # ADJ_SITE_INFO |
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assert len(bits) >= 72 |
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d['msg_type'] = 'ADJ_SITE_INFO' |
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d1 = {} |
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d2 = {} |
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bits = bits[8:] |
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d1['location'] = locid(bits[:24]) |
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bits = bits[24:] |
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d1['option'] = mk_int(bits[:8]) |
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bits = bits[8:] |
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d1['cc'] = mk_freq(mk_int(bits[:16])) |
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bits = bits[16:] |
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d2['location'] = locid(bits[:24]) |
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bits = bits[24:] |
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d2['option'] = mk_int(bits[:8]) |
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bits = bits[8:] |
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d2['cc'] = mk_freq(mk_int(bits[:16])) |
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bits = bits[16:] |
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d['sites'] = [d1, d2] |
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#d['location_3'] = locid(bits[:24]) |
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#bits = bits[24:] |
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#d['option_3'] = mk_int(bits[:6]) |
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#bits = bits[6:] |
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#d['cc_3'] = mk_int(bits[:10]) |
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elif msg_type == 0x04: # VCALL_ASSGN |
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assert len(bits) >= 72 |
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d['msg_type'] = 'VCALL_ASSGN' |
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bits = bits[8:] |
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d['option'] = mk_int(bits[:8]) |
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bits = bits[8:] |
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d['call_option'] = mk_int(bits[:8]) |
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bits = bits[8:] |
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d['source_id'] = mk_int(bits[:16]) |
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bits = bits[16:] |
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d['group_id'] = mk_int(bits[:16]) |
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bits = bits[16:] |
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d['timer'] = mk_int(bits[:8]) |
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bits = bits[8:] |
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d['f1'] = mk_freq(mk_int(bits[:16])) |
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bits = bits[16:] |
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d['f2'] = mk_freq(mk_int(bits[:16])) |
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elif msg_type == 0x20: # REG_RESP |
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assert len(bits) >= 72 |
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d['msg_type'] = 'REG_RESP' |
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bits = bits[8:] |
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d['option'] = mk_int(bits[:8]) |
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bits = bits[8:] |
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d['location id'] = mk_int(bits[:16]) |
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bits = bits[16:] |
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d['unit_id'] = mk_int(bits[:16]) |
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bits = bits[16:] |
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d['group_id'] = mk_int(bits[:16]) |
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bits = bits[16:] |
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d['cause'] = mk_int(bits[:8]) |
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bits = bits[8:] |
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d['visitor_unit'] = mk_int(bits[:16]) |
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bits = bits[16:] |
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d['visitor_group'] = mk_int(bits[:16]) |
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else: # msg type unhandled |
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d['msg_type'] = 'UNSUPPORTED 0x%x' % (msg_type) |
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return d |
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