[fix](trx-rs): keep SDR center frequency stable in-band

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

src/trx-core/src/rig/command.rs

@@ -10,6 +10,7 @@ use crate::RigMode;
 pub enum RigCommand {
     GetSnapshot,
     SetFreq(Freq),
+    SetCenterFreq(Freq),
     SetMode(RigMode),
     SetPtt(bool),
     PowerOn,

src/trx-core/src/rig/controller/handlers.rs

@@ -491,6 +491,7 @@ pub fn command_from_rig_command(cmd: RigCommand) -> Box<dyn RigCommandHandler> {
     match cmd {
         RigCommand::GetSnapshot => Box::new(GetSnapshotCommand),
         RigCommand::SetFreq(freq) => Box::new(SetFreqCommand::new(freq)),
+        RigCommand::SetCenterFreq(_) => Box::new(GetSnapshotCommand),
         RigCommand::SetMode(mode) => Box::new(SetModeCommand::new(mode)),
         RigCommand::SetPtt(ptt) => Box::new(SetPttCommand::new(ptt)),
         RigCommand::PowerOn => Box::new(PowerOnCommand),

src/trx-core/src/rig/mod.rs

@@ -88,6 +88,16 @@ pub trait RigCat: Rig + Send {
         freq: Freq,
     ) -> Pin<Box<dyn Future<Output = DynResult<()>> + Send + 'a>>;
 
+    fn set_center_freq<'a>(
+        &'a mut self,
+        _freq: Freq,
+    ) -> Pin<Box<dyn Future<Output = DynResult<()>> + Send + 'a>> {
+        Box::pin(std::future::ready(Err(
+            Box::new(response::RigError::not_supported("set_center_freq"))
+                as Box<dyn std::error::Error + Send + Sync>,
+        )))
+    }
+
     fn set_mode<'a>(
         &'a mut self,
         mode: RigMode,