69 lines
2.1 KiB
Python
69 lines
2.1 KiB
Python
# -*- coding: utf-8 -*-
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# TRX Toolkit
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# Burst forwarding between transceivers
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#
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# (C) 2017-2020 by Vadim Yanitskiy <axilirator@gmail.com>
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# Contributions by sysmocom - s.f.m.c. GmbH
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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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import logging as log
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from trx_list import TRXList
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class BurstForwarder(TRXList):
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""" Performs burst forwarding between transceivers.
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BurstForwarder distributes bursts between the list of given
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FakeTRX (Transceiver) instances depending on the following
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parameters of each transceiver:
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- execution state (running or idle),
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- actual RX / TX frequencies,
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- list of active timeslots.
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Each to be distributed 'TxMsg' message is being transformed
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into a 'RxMsg' message, and then forwarded to transceivers
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with partially initialized header. All uninitialized header
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fields (such as rssi and toa256) shall be set by each
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transceiver individually before sending towards the L1.
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"""
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def forward_msg(self, src_trx, rx_msg):
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# Originating Transceiver may use frequency hopping,
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# so let's precalculate its Tx frequency in advance
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tx_freq = src_trx.get_tx_freq(rx_msg.fn)
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if src_trx.rf_muted:
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del rx_msg.burst # burst bits are omited
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rx_msg.burst = 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 trx == src_trx:
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continue
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# Check transceiver state
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if not trx.running:
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continue
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# Match Tx/Rx frequencies of the both transceivers
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if trx.get_rx_freq(rx_msg.fn) != tx_freq:
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continue
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# Transform from TxMsg to RxMsg and forward
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tx_msg = rx_msg.trans(ver = trx.data_if._hdr_ver)
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trx.handle_data_msg(src_trx, rx_msg, tx_msg)
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