kopia lustrzana https://github.com/mobilinkd/tnc3-firmware
62 wiersze
1.5 KiB
C++
62 wiersze
1.5 KiB
C++
// Copyright 2017 Rob Riggs <rob@mobilinkd.com>
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// All rights reserved.
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#include "Digipeater.hpp"
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#include "Digipeater.h"
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#include "IOEventTask.h"
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/*
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* APRS Digipeater implementation.
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*
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* Note that these rules are for digipeating only. We have other rules for
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* packets sent to this station directly.
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*
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* 0. Ignore all packets that are not UI packets.
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* 1. Ignore all packets with destination address == MYCALL or any ALIASES.
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* 2. Compute CRC32 on source and destination address, and information fields.
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* 3. Ignore all packets with same CRC32 heard in past 30 seconds.
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* 4. Ignore all digipeated VIA entries.
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* 5. Find VIA entries matching preempted aliases.
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* 5.1. http://www.aprs.org/aprs12/preemptive-digipeating.txt
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* 6. Find first non-digipeated VIA entry.
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* 6.1. If it matches one of our set and used aliases, relay.
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*/
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void startDigipeaterTask(void* arg)
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{
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using mobilinkd::tnc::Digipeater;
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using mobilinkd::tnc::hdlc::IoFrame;
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auto digi = static_cast<Digipeater*>(arg);
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for(;;)
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{
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osEvent evt = osMessageGet(digipeaterQueueHandle, osWaitForever);
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if (evt.status != osEventMessage) continue;
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uint32_t cmd = evt.value.v;
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if (cmd < FLASH_BASE) // Assumes FLASH_BASE < SRAM_BASE.
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{
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// this is a command, not a packet.
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return;
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}
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digi->clean_history();
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auto frame = static_cast<IoFrame*>(evt.value.p);
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if (!digi->can_repeat(frame)) continue;
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auto digi_frame = digi->rewrite_frame(frame);
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}
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}
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void beacon(void* arg)
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{
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}
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namespace mobilinkd { namespace tnc {
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}} // mobilinkd::tnc
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