78 lines
2.2 KiB
Python
78 lines
2.2 KiB
Python
# -*- coding: utf-8 -*-
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# TRX Toolkit
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# Power measurement emulation
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#
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# (C) 2017-2018 by Vadim Yanitskiy <axilirator@gmail.com>
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#
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# All Rights Reserved
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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from random import randint
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class FakePM:
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""" Power measurement emulation for fake transceivers.
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There is no such thing like RF signal level in fake Um-interface,
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so we need to emulate this. The main idea is to have a list of
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all running and idle transceivers. As soon as a measurement
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request is received, FakePM will attempt to find a running
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transceiver on a given frequency.
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The result of such "measurement" is a random RSSI value
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in one of the following ranges:
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- trx_min ... trx_max - if at least one TRX was found,
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- noise_min ... noise_max - no TRX instances were found.
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FIXME: it would be great to average the rate of bursts
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and indicated power / attenuation values for all
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matching transceivers, so "pure traffic" ARFCNs
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would be handled properly.
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"""
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def __init__(self, noise_min, noise_max, trx_min, trx_max):
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# Init list of transceivers
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self.trx_list = []
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# RSSI randomization ranges
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self.noise_min = noise_min
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self.noise_max = noise_max
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self.trx_min = trx_min
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self.trx_max = trx_max
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@property
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def rssi_noise(self):
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return randint(self.noise_min, self.noise_max)
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@property
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def rssi_trx(self):
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return randint(self.trx_min, self.trx_max)
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def measure(self, freq, fn = None):
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# Iterate over all known transceivers
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for trx in self.trx_list:
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if not trx.running:
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continue
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# FIXME: we need to know current TDMA frame number here,
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# because some transceivers may use frequency hopping
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if trx.fh is not None and fn is None:
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continue
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# Match by given frequency
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if trx.get_tx_freq(fn) == freq:
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return self.rssi_trx
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return self.rssi_noise
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