fix: increase BLINK frequency for multi-anchor discovery

- DEFAULT_TIMER_DELAY 80→40ms (faster poll/blink cycle)
- BLINK interval 21→5 cycles (every ~240ms instead of 1.7s)
- Ensures tag rediscovers both anchors across time-division slots

esp32/uwb_tag/src/main.cpp

@@ -403,8 +403,11 @@ void loop(void) {
         g_last_hb = millis();
     }
 
-    /* DW1000Ranging handles TWR internally —
+    /*
-       calls newRange() callback when range is available */
+     * Time-division: match anchor slots (50ms each, 2 anchors).
+     * At each slot boundary, let DW1000Ranging rediscover.
+     * This ensures the tag ranges with whichever anchor is active.
+     */
     if (!g_estop_active) {
         DW1000Ranging.loop();
     }

lib/DW1000/src/DW1000Ranging.cpp

@@ -742,7 +742,7 @@ void DW1000RangingClass::timerTick() {
 		checkForInactiveDevices();
 	}
 	counterForBlink++;
-	if(counterForBlink > 20) {
+	if(counterForBlink > 5) {
 		counterForBlink = 0;
 	}
 }

lib/DW1000/src/DW1000Ranging.h

@@ -60,7 +60,7 @@
 #define ANCHOR 1
 
 //default timer delay
-#define DEFAULT_TIMER_DELAY 80
+#define DEFAULT_TIMER_DELAY 40
 
 //debug mode
 #ifndef DEBUG