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Return LinkCheckAns with margin=0 for non-LoRa modulations.
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This commit is contained in:
Orne Brocaar 2025-01-22 09:09:27 +00:00
parent 8cb2d4f383
commit 99613014ad
1 changed files with 29 additions and 20 deletions
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49
chirpstack/src/maccommand/link_check.rs
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@ -27,31 +27,40 @@ pub fn handle(
.as_ref()
.ok_or_else(|| anyhow!("parameters can not be None"))?;
if let gw::modulation::Parameters::Lora(pl) = mod_params {
let required_snr = config::get_required_snr_for_sf(pl.spreading_factor as u8)?;
let mut max_snr: f32 = 0.0;
// For non-LoRa modulations, the margin will be set to 0, as it can not be calculated.
// This way, at least the gw_cnt can be provided and the end-device is able to confirm
// it is still connected.
let margin = match mod_params {
gw::modulation::Parameters::Lora(pl) => {
let required_snr = config::get_required_snr_for_sf(pl.spreading_factor as u8)?;
let mut max_snr: f32 = 0.0;
for (i, rx_info) in ufs.rx_info_set.iter().enumerate() {
if i == 0 || rx_info.snr > max_snr {
max_snr = rx_info.snr;
for (i, rx_info) in ufs.rx_info_set.iter().enumerate() {
if i == 0 || rx_info.snr > max_snr {
max_snr = rx_info.snr;
}
}
let margin = max_snr - required_snr;
if margin < 0.0 {
0.0
} else {
margin
}
}
let mut margin = max_snr - required_snr;
if margin < 0.0 {
margin = 0.0;
_ => {
warn!("Modulation does not provide margin to LinkCheckReq");
0.0
}
};
return Ok(Some(lrwn::MACCommandSet::new(vec![
lrwn::MACCommand::LinkCheckAns(lrwn::LinkCheckAnsPayload {
margin: margin as u8,
gw_cnt: ufs.rx_info_set.len() as u8,
}),
])));
}
warn!("Unsupported modulation for LinkCheckReq");
Ok(None)
// We always return a LinkCheckAns, even
Ok(Some(lrwn::MACCommandSet::new(vec![
lrwn::MACCommand::LinkCheckAns(lrwn::LinkCheckAnsPayload {
margin: margin as u8,
gw_cnt: ufs.rx_info_set.len() as u8,
}),
])))
}
#[cfg(test)]