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Add new ROUTER_LATE role (#5528)

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Will always rebroadcast packets, but will do so after all other modes.
Intended for router nodes that are there to provide additional coverage
in areas not already covered by other routers, or to bridge around
problematic terrain, but should not be given priority over other routers
in order to avoid unnecessaraily consuming hops.

By default, this role will rebroadcast during the normal client window.
However, if another node is overheard rebroadcasting the packet, then it
will be moved to a second window *after* the normal client one, with the
same timing behaviour.
This commit is contained in:
Erayd
2024-12-28 11:52:18 +13:00
committed by GitHub
parent 2b33be2fea
commit b2808063d0
7 changed files with 120 additions and 30 deletions
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20
src/mesh/RadioInterface.cpp
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@@ -254,8 +254,8 @@ uint32_t RadioInterface::getTxDelayMsec()
return random(0, pow(2, CWsize)) * slotTimeMsec;
}
/** The delay to use when we want to flood a message */
uint32_t RadioInterface::getTxDelayMsecWeighted(float snr)
/** The CW size to use when calculating SNR_based delays */
uint8_t RadioInterface::getCWsize(float snr)
{
// The minimum value for a LoRa SNR
const uint32_t SNR_MIN = -20;
@@ -263,10 +263,24 @@ uint32_t RadioInterface::getTxDelayMsecWeighted(float snr)
// The maximum value for a LoRa SNR
const uint32_t SNR_MAX = 15;
return map(snr, SNR_MIN, SNR_MAX, CWmin, CWmax);
}
/** The worst-case SNR_based packet delay */
uint32_t RadioInterface::getTxDelayMsecWeightedWorst(float snr)
{
uint8_t CWsize = getCWsize(snr);
// offset the maximum delay for routers: (2 * CWmax * slotTimeMsec)
return (2 * CWmax * slotTimeMsec) + pow(2, CWsize) * slotTimeMsec;
}
/** The delay to use when we want to flood a message */
uint32_t RadioInterface::getTxDelayMsecWeighted(float snr)
{
// high SNR = large CW size (Long Delay)
// low SNR = small CW size (Short Delay)
uint32_t delay = 0;
uint8_t CWsize = map(snr, SNR_MIN, SNR_MAX, CWmin, CWmax);
uint8_t CWsize = getCWsize(snr);
// LOG_DEBUG("rx_snr of %f so setting CWsize to:%d", snr, CWsize);
if (config.device.role == meshtastic_Config_DeviceConfig_Role_ROUTER ||
config.device.role == meshtastic_Config_DeviceConfig_Role_REPEATER) {