fix: Antenna Genius show only available antennas per band

internal/antgenius/antgenius.go

@@ -32,9 +32,13 @@ const (
 )
 
 // Antenna is one configured antenna (index + name as stored on the device).
+// Bands is the device's band bitmask for the antenna (which bands it covers);
+// 0 = unknown/all. The UI uses it to show only band-appropriate antennas, like
+// the native 4O3A app.
 type Antenna struct {
 	Index int    `json:"index"`
 	Name  string `json:"name"`
+	Bands int    `json:"bands"`
 }
 
 // Status is the snapshot the UI renders.
@@ -65,6 +69,8 @@ type Client struct {
 	statusMu sync.RWMutex
 	status   Status
 	antennas map[int]string // index → name (rebuilt into status.Antennas)
+	antBands map[int]int    // index → band bitmask (which bands the antenna covers)
+	antRawN  int            // one-shot: how many raw antenna lines we've logged
 
 	stop    chan struct{}
 	running bool
@@ -80,6 +86,7 @@ func New(host string, port int, password string) *Client {
 		password: strings.TrimSpace(password),
 		stop:     make(chan struct{}),
 		antennas: map[int]string{},
+		antBands: map[int]int{},
 		status:   Status{Host: host},
 	}
 }
@@ -356,13 +363,24 @@ func (c *Client) parseAntenna(msg string) {
 		// The device stores spaces as underscores in names.
 		name = strings.TrimSpace(strings.ReplaceAll(name, "_", " "))
 	}
+	// Band bitmask: which bands this antenna is configured for. The device sends
+	// it as "band=<mask>" (a bitmask). Kept so the UI can show only band-relevant
+	// antennas (like the native app). Log the first few raw antenna lines so the
+	// exact field name + bit values can be confirmed on real hardware.
+	bands := kvInt(msg, "band")
 	c.statusMu.Lock()
+	if c.antRawN < 8 {
+		c.antRawN++
+		applog.Printf("antgenius: antenna raw #%d: %q (parsed band mask=%d/0x%X)", c.antRawN, msg, bands, bands)
+	}
 	if name != "" && !isPlaceholderName(name) {
 		c.antennas[id] = name
+		c.antBands[id] = bands
 	} else {
 		delete(c.antennas, id) // unconfigured slot ("Antenna 4", etc.) → not shown
+		delete(c.antBands, id)
 	}
-	c.status.Antennas = sortedAntennas(c.antennas)
+	c.status.Antennas = sortedAntennas(c.antennas, c.antBands)
 	c.status.Connected = true
 	c.statusMu.Unlock()
 }
@@ -431,10 +449,10 @@ func isPlaceholderName(name string) bool {
 	return err == nil
 }
 
-func sortedAntennas(m map[int]string) []Antenna {
+func sortedAntennas(m map[int]string, bands map[int]int) []Antenna {
 	out := make([]Antenna, 0, len(m))
 	for idx, name := range m {
-		out = append(out, Antenna{Index: idx, Name: name})
+		out = append(out, Antenna{Index: idx, Name: name, Bands: bands[idx]})
 	}
 	sort.Slice(out, func(i, j int) bool { return out[i].Index < out[j].Index })
 	return out