[feat](trx-rs): expose live sdr gain control

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-protocol/src/codec.rs

@@ -297,6 +297,7 @@ mod tests {
                 bandwidth_hz: 3000,
                 fir_taps: 64,
                 cw_center_hz: 700,
+                sdr_gain_db: Some(12.0),
                 wfm_deemphasis_us: 75,
                 wfm_stereo: true,
                 wfm_stereo_detected: false,
@@ -335,6 +336,7 @@ mod tests {
                 bandwidth_hz: 12000,
                 fir_taps: 128,
                 cw_center_hz: 700,
+                sdr_gain_db: Some(18.0),
                 wfm_deemphasis_us: 50,
                 wfm_stereo: true,
                 wfm_stereo_detected: true,
@@ -346,6 +348,7 @@ mod tests {
         let f = decoded.filter.expect("filter should round-trip");
         assert_eq!(f.bandwidth_hz, 12000);
         assert_eq!(f.fir_taps, 128);
+        assert_eq!(f.sdr_gain_db, Some(18.0));
         assert_eq!(f.wfm_deemphasis_us, 50);
         assert!(f.wfm_stereo_detected);
     }

src/trx-protocol/src/mapping.rs

@@ -48,6 +48,7 @@ pub fn client_command_to_rig(cmd: ClientCommand) -> RigCommand {
         ClientCommand::ResetWsprDecoder => RigCommand::ResetWsprDecoder,
         ClientCommand::SetBandwidth { bandwidth_hz } => RigCommand::SetBandwidth(bandwidth_hz),
         ClientCommand::SetFirTaps { taps } => RigCommand::SetFirTaps(taps),
+        ClientCommand::SetSdrGain { gain_db } => RigCommand::SetSdrGain(gain_db),
         ClientCommand::SetWfmDeemphasis { deemphasis_us } => {
             RigCommand::SetWfmDeemphasis(deemphasis_us)
         }
@@ -93,6 +94,7 @@ pub fn rig_command_to_client(cmd: RigCommand) -> ClientCommand {
         RigCommand::ResetWsprDecoder => ClientCommand::ResetWsprDecoder,
         RigCommand::SetBandwidth(bandwidth_hz) => ClientCommand::SetBandwidth { bandwidth_hz },
         RigCommand::SetFirTaps(taps) => ClientCommand::SetFirTaps { taps },
+        RigCommand::SetSdrGain(gain_db) => ClientCommand::SetSdrGain { gain_db },
         RigCommand::SetWfmDeemphasis(deemphasis_us) => {
             ClientCommand::SetWfmDeemphasis { deemphasis_us }
         }

src/trx-protocol/src/types.rs

@@ -38,6 +38,7 @@ pub enum ClientCommand {
     ResetWsprDecoder,
     SetBandwidth { bandwidth_hz: u32 },
     SetFirTaps { taps: u32 },
+    SetSdrGain { gain_db: f64 },
     SetWfmDeemphasis { deemphasis_us: u32 },
     SetWfmStereo { enabled: bool },
     GetSpectrum,