Add dynamic UART/BLE host connect for serve, dashboard, and WS.

Serve starts without a required port; REST/WS/UI can scan and switch transports, with BLE live ticks and UART-only OTA.

Co-authored-by: Cursor <cursoragent@cursor.com>

goTool/ble_link.go

@@ -37,15 +37,6 @@ func openBLE(name string, settle time.Duration) (*bleLink, error) {
 		return nil, fmt.Errorf("enable bluetooth adapter: %w (check BlueZ / permissions)", err)
 	}
 
-	svcUUID, err := bluetooth.ParseUUID(bleServiceUUID)
-	if err != nil {
-		return nil, err
-	}
-	chrUUID, err := bluetooth.ParseUUID(bleCharUUID)
-	if err != nil {
-		return nil, err
-	}
-
 	log.Printf("BLE scanning for %q…", name)
 	var foundAddr bluetooth.Address
 	var found bool
@@ -53,7 +44,7 @@ func openBLE(name string, settle time.Duration) (*bleLink, error) {
 		time.Sleep(15 * time.Second)
 		_ = adapter.StopScan()
 	}()
-	err = adapter.Scan(func(a *bluetooth.Adapter, result bluetooth.ScanResult) {
+	err := adapter.Scan(func(a *bluetooth.Adapter, result bluetooth.ScanResult) {
 		if result.LocalName() != name {
 			return
 		}
@@ -67,9 +58,57 @@ func openBLE(name string, settle time.Duration) (*bleLink, error) {
 	if !found {
 		return nil, fmt.Errorf("device %q not found (check DIP8=BLE and advertising)", name)
 	}
+	return connectBLEDevice(foundAddr, settle)
+}
 
-	log.Printf("BLE connecting…")
-	device, err := adapter.Connect(foundAddr, bluetooth.ConnectionParams{})
+func openBLEAddress(addrStr string, settle time.Duration) (*bleLink, error) {
+	adapter := bluetooth.DefaultAdapter
+	if err := adapter.Enable(); err != nil {
+		return nil, fmt.Errorf("enable bluetooth adapter: %w (check BlueZ / permissions)", err)
+	}
+	if mac, err := bluetooth.ParseMAC(addrStr); err == nil {
+		var addr bluetooth.Address
+		addr.Set(mac.String())
+		return connectBLEDevice(addr, settle)
+	}
+	// Fallback: scan until address string matches
+	log.Printf("BLE resolving address %s via scan…", addrStr)
+	var foundAddr bluetooth.Address
+	var found bool
+	go func() {
+		time.Sleep(15 * time.Second)
+		_ = adapter.StopScan()
+	}()
+	err := adapter.Scan(func(a *bluetooth.Adapter, result bluetooth.ScanResult) {
+		if result.Address.String() != addrStr {
+			return
+		}
+		foundAddr = result.Address
+		found = true
+		_ = a.StopScan()
+	})
+	if err != nil {
+		return nil, fmt.Errorf("scan for address: %w", err)
+	}
+	if !found {
+		return nil, fmt.Errorf("BLE address %s not found", addrStr)
+	}
+	return connectBLEDevice(foundAddr, settle)
+}
+
+func connectBLEDevice(addr bluetooth.Address, settle time.Duration) (*bleLink, error) {
+	svcUUID, err := bluetooth.ParseUUID(bleServiceUUID)
+	if err != nil {
+		return nil, err
+	}
+	chrUUID, err := bluetooth.ParseUUID(bleCharUUID)
+	if err != nil {
+		return nil, err
+	}
+
+	adapter := bluetooth.DefaultAdapter
+	log.Printf("BLE connecting to %s…", addr.String())
+	device, err := adapter.Connect(addr, bluetooth.ConnectionParams{})
 	if err != nil {
 		return nil, fmt.Errorf("connect: %w", err)
 	}