new display RF load & remove ch display

src/display.cpp

@@ -292,7 +292,7 @@ void dp_drawPage(time_t t, bool nextpage) {
 #endif
     dp_println();
 
-    // line 4: Battery + GPS status + Wifi channel
+    // line 4: Battery + GPS status + RF traffic
     // B:a.bcV Sats:ab ch:ab
 #if (defined BAT_MEASURE_ADC || defined HAS_PMU || defined HAS_IP5306)
     if (batt_level == 0)
@@ -310,7 +310,7 @@ void dp_drawPage(time_t t, bool nextpage) {
 #else
     dp_printf("       ");
 #endif
-    dp_printf(" ch:%02d", channel);
+    dp_printf(" due:%02d", rf_load);
     dp_println();
 
     // line 5: RSSI limiter + free memory

src/macsniff.cpp

@@ -79,8 +79,12 @@ void mac_process(void *pvParameters) {
     if (xQueueReceive(MacQueue, &MacBuffer, portMAX_DELAY) != pdTRUE) {
       ESP_LOGE(TAG, "Premature return from xQueueReceive() with no data!");
       continue;
-    } else
-      mac_analyze(MacBuffer);
+    }
+
+    // update traffic indicator
+    rf_load = uxQueueMessagesWaiting(MacQueue);
+    // process fetched mac
+    mac_analyze(MacBuffer);
   }
   delay(2); // yield to CPU
 }

src/main.cpp

@@ -87,8 +87,8 @@ triggers pps 1 sec impulse
 
 configData_t cfg; // struct holds current device configuration
 char lmic_event_msg[LMIC_EVENTMSG_LEN]; // display buffer for LMIC event message
-uint8_t volatile channel = 0;           // channel rotation counter
 uint8_t batt_level = 0;                 // display value
+uint8_t volatile rf_load = 0;           // RF traffic indicator
 uint16_t volatile macs_wifi = 0, macs_ble = 0; // globals for display
 
 hw_timer_t *ppsIRQ = NULL, *displayIRQ = NULL, *matrixDisplayIRQ = NULL;

src/wifiscan.cpp

@@ -41,6 +41,7 @@ IRAM_ATTR void wifi_sniffer_packet_handler(void *buff,
 
 // Software-timer driven Wifi channel rotation callback function
 void switchWifiChannel(TimerHandle_t xTimer) {
+  static uint8_t channel = 0; // channel rotation counter
   _ASSERT(xTimer != NULL);
   channel =
       (channel % WIFI_CHANNEL_MAX) + 1; // rotate channel 1..WIFI_CHANNEL_MAX