feat(mesh): rnode-config RPCs + honest reboot feedback with reply channels

- mesh.rnode-config: persisted RF settings + best-effort live radio
  state (radio-confirmed r_* values) for the LoRa panel.
- mesh.rnode-config-apply: validate → persist → restart the radio
  daemon → poll the read-back until the radio reports online, returning
  {applied, confirmed, live, message}. Failure modes report what
  actually happened instead of pretending success.
- RebootRadio carries a reply channel: Meshtastic reboots firmware,
  Reticulum restarts the sidecar (re-detect + reapply RF config),
  MeshCore honestly reports it has no remote reboot — previously the
  Reticulum/MeshCore arms returned Ok(()) doing NOTHING: the operator's
  "button gives no feedback" bug.
- MeshCommand::QueryRadioState plumbs the sidecar's radio_state to the
  service layer with a timeout instead of fire-and-forget.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

core/archipelago/src/api/rpc/dispatcher.rs

@@ -405,6 +405,8 @@ impl RpcHandler {
             "mesh.send-channel" => self.handle_mesh_send_channel(params).await,
             "mesh.broadcast" => self.handle_mesh_broadcast().await,
             "mesh.reboot-radio" => self.handle_mesh_reboot_radio(params).await,
+            "mesh.rnode-config" => self.handle_mesh_rnode_config().await,
+            "mesh.rnode-config-apply" => self.handle_mesh_rnode_config_apply(params).await,
             "mesh.configure" => self.handle_mesh_configure(params).await,
             "mesh.send-invoice" => self.handle_mesh_send_invoice(params).await,
             "mesh.send-coordinate" => self.handle_mesh_send_coordinate(params).await,

core/archipelago/src/api/rpc/mesh/messaging.rs

@@ -104,10 +104,115 @@ impl RpcHandler {
             .as_ref()
             .ok_or_else(|| anyhow::anyhow!("Mesh service not running. Enable mesh first."))?;
 
-        svc.reboot_radio(seconds).await?;
+        let message = svc.reboot_radio(seconds).await?;
         info!(seconds, "Mesh radio reboot requested via RPC");
 
-        Ok(serde_json::json!({ "reboot": true, "seconds": seconds }))
+        Ok(serde_json::json!({ "reboot": true, "seconds": seconds, "message": message }))
+    }
+
+    /// mesh.rnode-config — persisted RF settings + the live radio state
+    /// (radio-confirmed values) for the LoRa settings panel. `live` is best-
+    /// effort: null with `live_error` when no Reticulum radio is connected.
+    pub(in crate::api::rpc) async fn handle_mesh_rnode_config(&self) -> Result<serde_json::Value> {
+        let settings = mesh::rnode_settings::RNodeRfSettings::load(&self.config.data_dir).await;
+        let (live, live_error) = match self.mesh_service.read().await.as_ref() {
+            Some(svc) => match svc.radio_state().await {
+                Ok(state) => (Some(state), None),
+                Err(e) => (None, Some(format!("{e:#}"))),
+            },
+            None => (None, Some("Mesh service not running".to_string())),
+        };
+        Ok(serde_json::json!({
+            "settings": settings,
+            "live": live,
+            "live_error": live_error,
+        }))
+    }
+
+    /// mesh.rnode-config-apply — validate + persist the RF settings, restart
+    /// the radio daemon so they take effect, then read back the radio-
+    /// confirmed values as proof. Returns { applied, live, message }; a
+    /// failed read-back still reports the persisted settings with a clear
+    /// message instead of pretending success.
+    pub(in crate::api::rpc) async fn handle_mesh_rnode_config_apply(
+        &self,
+        params: Option<serde_json::Value>,
+    ) -> Result<serde_json::Value> {
+        let params = params.ok_or_else(|| anyhow::anyhow!("Missing params"))?;
+        let settings: mesh::rnode_settings::RNodeRfSettings = serde_json::from_value(
+            params
+                .get("settings")
+                .cloned()
+                .ok_or_else(|| anyhow::anyhow!("Missing 'settings'"))?,
+        )
+        .map_err(|e| anyhow::anyhow!("Invalid settings: {e}"))?;
+        settings.validate()?;
+        settings.save(&self.config.data_dir).await?;
+        info!(?settings, "RNode RF settings persisted");
+
+        // Restart the radio daemon so the new args apply. No radio connected
+        // is fine — the settings apply on the next connect.
+        let service = self.mesh_service.read().await;
+        let Some(svc) = service.as_ref() else {
+            return Ok(serde_json::json!({
+                "applied": false,
+                "message": "Settings saved. They apply when the mesh service next connects to the radio.",
+            }));
+        };
+        if let Err(e) = svc.reboot_radio(2).await {
+            return Ok(serde_json::json!({
+                "applied": false,
+                "message": format!(
+                    "Settings saved, but the radio daemon restart failed: {e:#}. \
+                     They apply on the next reconnect."
+                ),
+            }));
+        }
+
+        // Read-back: poll until the respawned daemon reports the radio online
+        // with our applied values (the respawn re-detects the RNode, ~15s).
+        let deadline = tokio::time::Instant::now() + std::time::Duration::from_secs(45);
+        let mut last_live = None;
+        while tokio::time::Instant::now() < deadline {
+            tokio::time::sleep(std::time::Duration::from_secs(3)).await;
+            if let Ok(state) = svc.radio_state().await {
+                let online = state
+                    .get("online")
+                    .and_then(|v| v.as_bool())
+                    .unwrap_or(false);
+                last_live = Some(state);
+                if online {
+                    break;
+                }
+            }
+        }
+        match last_live {
+            Some(live) => {
+                let confirmed = live
+                    .get("r_frequency")
+                    .and_then(|v| v.as_u64())
+                    .map(|f| f == settings.frequency)
+                    .unwrap_or(false);
+                Ok(serde_json::json!({
+                    "applied": true,
+                    "confirmed": confirmed,
+                    "live": live,
+                    "message": if confirmed {
+                        "The radio confirmed it is now using the applied settings."
+                    } else {
+                        "Settings applied and the daemon restarted; the radio has not \
+                         confirmed the new values yet — recheck in a few seconds."
+                    },
+                }))
+            }
+            None => Ok(serde_json::json!({
+                "applied": true,
+                "confirmed": false,
+                "live": null,
+                "message": "Settings applied and the daemon restarted, but it has not \
+                            reported the radio state yet — recheck in a few seconds.",
+            })),
+        }
     }
 
     /// mesh.configure — Enable/disable mesh and set device path.