diff --git a/README.md b/README.md
index 7eab7e415..c6bb8a577 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,6 @@ Depending on board hardware following features are supported:
 - OLED Display (shows detailed status)
 - RGB LED (shows colorized status)
 - Button (short press: flip display page / long press: send alarm message)
-- Silicon unique ID
 - Battery voltage monitoring (analog read / AXP192 / IP5306)
 - GPS (Generic serial NMEA, or Quectel L76 I2C)
 - Environmental sensors (Bosch BMP180/BME280/BME680 I2C; SDS011 serial)
diff --git a/include/globals.h b/include/globals.h
index 42c3257e8..39a42f799 100644
--- a/include/globals.h
+++ b/include/globals.h
@@ -18,10 +18,6 @@
 #include "mallocator.h"
 #include <bsec.h>
 
-// sniffing types
-#define MAC_SNIFF_WIFI 0
-#define MAC_SNIFF_BLE 1
-
 // bits in payloadmask for filtering payload data
 #define GPS_DATA (0x01)
 #define ALARM_DATA (0x02)
@@ -67,9 +63,9 @@
 
 enum sendprio_t { prio_low, prio_normal, prio_high };
 enum timesource_t { _gps, _rtc, _lora, _unsynced };
-
+enum snifftype_t { MAC_SNIFF_WIFI, MAC_SNIFF_BLE, MAC_SNIFF_BLE_ENS };
 enum runmode_t {
-  RUNMODE_POWERCYCLE = 0,
+  RUNMODE_POWERCYCLE,
   RUNMODE_NORMAL,
   RUNMODE_WAKEUP,
   RUNMODE_UPDATE
@@ -114,6 +110,13 @@ typedef struct {
   uint8_t Message[PAYLOAD_BUFFER_SIZE];
 } MessageBuffer_t;
 
+// Struct for MAC processing queue
+typedef struct {
+  uint8_t mac[6];
+  int8_t rssi;
+  snifftype_t sniff_type;
+} MacBuffer_t;
+
 typedef struct {
   int32_t latitude;
   int32_t longitude;
@@ -145,13 +148,14 @@ extern std::array<uint64_t, 0xff> beacons;
 extern configData_t cfg;                       // current device configuration
 extern char lmic_event_msg[LMIC_EVENTMSG_LEN]; // display buffer
 extern uint8_t volatile channel;               // wifi channel rotation counter
+extern uint8_t volatile rf_load;               // RF traffic indicator
 extern uint8_t batt_level;                     // display value
 extern uint16_t volatile macs_wifi, macs_ble;  // display values
 extern bool volatile TimePulseTick; // 1sec pps flag set by GPS or RTC
 extern timesource_t timeSource;
 extern hw_timer_t *displayIRQ, *matrixDisplayIRQ, *ppsIRQ;
 extern SemaphoreHandle_t I2Caccess;
-extern TaskHandle_t irqHandlerTask, ClockTask;
+extern TaskHandle_t irqHandlerTask, ClockTask, macProcessTask;
 extern TimerHandle_t WifiChanTimer;
 extern Timezone myTZ;
 extern RTC_DATA_ATTR runmode_t RTC_runmode;
diff --git a/include/macsniff.h b/include/macsniff.h
index e119d9a34..175cba588 100644
--- a/include/macsniff.h
+++ b/include/macsniff.h
@@ -14,13 +14,12 @@
 #include "corona.h"
 #endif
 
-#define MAC_SNIFF_WIFI 0
-#define MAC_SNIFF_BLE 1
-#define MAC_SNIFF_BLE_CWA 2
-
 uint16_t get_salt(void);
 uint64_t macConvert(uint8_t *paddr);
-uint16_t mac_add(uint8_t *paddr, int8_t rssi, bool sniff_type);
+esp_err_t macQueueInit(void);
+void mac_process(void *pvParameters);
+void IRAM_ATTR mac_add(uint8_t *paddr, int8_t rssi, snifftype_t sniff_type);
+uint16_t mac_analyze(MacBuffer_t MacBuffer);
 void printKey(const char *name, const uint8_t *key, uint8_t len, bool lsb);
 
 #endif
diff --git a/platformio_orig.ini b/platformio_orig.ini
index dc5089902..dbaa6046d 100644
--- a/platformio_orig.ini
+++ b/platformio_orig.ini
@@ -46,7 +46,7 @@ description = Paxcounter is a device for metering passenger flows in realtime. I
 
 [common]
 ; for release_version use max. 10 chars total, use any decimal format like "a.b.c"
-release_version = 2.0.3
+release_version = 2.0.4
 ; DEBUG LEVEL: For production run set to 0, otherwise device will leak RAM while running!
 ; 0=None, 1=Error, 2=Warn, 3=Info, 4=Debug, 5=Verbose
 debug_level = 3
diff --git a/src/blecsan.cpp b/src/blecsan.cpp
index 9a60e456c..b06e78a0f 100644
--- a/src/blecsan.cpp
+++ b/src/blecsan.cpp
@@ -6,14 +6,10 @@
 #define BT_BD_ADDR_HEX(addr)                                                   \
   addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]
 
-// UUID of Exposure Notification Service (ENS)
-// see
-// https://blog.google/documents/70/Exposure_Notification_-_Bluetooth_Specification_v1.2.2.pdf
-static const char ensMagicBytes[] = "\x16\x6f\xfd";
-
 // local Tag for logging
 static const char TAG[] = "bluetooth";
 
+#ifdef VERBOSE
 const char *bt_addr_t_to_string(esp_ble_addr_type_t type) {
   switch (type) {
   case BLE_ADDR_TYPE_PUBLIC:
@@ -110,15 +106,24 @@ const char *btsig_gap_type(uint32_t gap_type) {
     return "Unknown type";
   }
 } // btsig_gap_type
+#endif
 
-// using IRAM_:ATTR here to speed up callback function
+// using IRAM_ATTR here to speed up callback function
 IRAM_ATTR void gap_callback_handler(esp_gap_ble_cb_event_t event,
                                     esp_ble_gap_cb_param_t *param) {
 
   esp_ble_gap_cb_param_t *p = (esp_ble_gap_cb_param_t *)param;
 
+#if (COUNT_ENS)
+  // UUID of Exposure Notification Service (ENS)
+  // https://blog.google/documents/70/Exposure_Notification_-_Bluetooth_Specification_v1.2.2.pdf
+  static const char ensMagicBytes[] = "\x16\x6f\xfd";
+#endif
+
+#ifdef VERBOSE
   ESP_LOGV(TAG, "BT payload rcvd -> type: 0x%.2x -> %s", *p->scan_rst.ble_adv,
            btsig_gap_type(*p->scan_rst.ble_adv));
+#endif
 
   switch (event) {
   case ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT:
@@ -138,42 +143,37 @@ IRAM_ATTR void gap_callback_handler(esp_gap_ble_cb_event_t event,
     if (p->scan_rst.search_evt ==
         ESP_GAP_SEARCH_INQ_RES_EVT) // Inquiry result for a peer device
     {                               // evaluate sniffed packet
+#ifdef VERBOSE
       ESP_LOGV(TAG, "Device address (bda): %02x:%02x:%02x:%02x:%02x:%02x",
                BT_BD_ADDR_HEX(p->scan_rst.bda));
       ESP_LOGV(TAG, "Addr_type           : %s",
                bt_addr_t_to_string(p->scan_rst.ble_addr_type));
       ESP_LOGV(TAG, "RSSI                : %d", p->scan_rst.rssi);
-
-      if ((cfg.rssilimit) &&
-          (p->scan_rst.rssi < cfg.rssilimit)) { // rssi is negative value
-        ESP_LOGI(TAG, "BLTH RSSI %d -> ignoring (limit: %d)", p->scan_rst.rssi,
-                 cfg.rssilimit);
-        break;
-      }
+#endif
 
 #if (VENDORFILTER)
       if ((p->scan_rst.ble_addr_type == BLE_ADDR_TYPE_RANDOM) ||
           (p->scan_rst.ble_addr_type == BLE_ADDR_TYPE_RPA_RANDOM)) {
+#ifdef VERBOSE
         ESP_LOGV(TAG, "BT device filtered");
+#endif
         break;
       }
 #endif
 
-      // hash and add this device and show new count total if it was not
-      // previously added
-
-#if (COUNT_ENS)
-      uint16_t hashedmac =
-#endif
-
-          mac_add((uint8_t *)p->scan_rst.bda, p->scan_rst.rssi, MAC_SNIFF_BLE);
+      // add this device mac to processing queue
 
 #if (COUNT_ENS)
+      // check for ens signature
       if (cfg.enscount) {
-        // check for ens signature
-        if (NULL != strstr((const char *)p->scan_rst.ble_adv, ensMagicBytes))
-          cwa_mac_add(hashedmac);
+        if (strstr((const char *)p->scan_rst.ble_adv, ensMagicBytes) != NULL)
+          mac_add((uint8_t *)p->scan_rst.bda, p->scan_rst.rssi,
+                  MAC_SNIFF_BLE_ENS);
+        else
+          mac_add((uint8_t *)p->scan_rst.bda, p->scan_rst.rssi, MAC_SNIFF_BLE);
       }
+#else
+      mac_add((uint8_t *)p->scan_rst.bda, p->scan_rst.rssi, MAC_SNIFF_BLE);
 #endif
 
       /* to be improved in vendorfilter if:
@@ -186,8 +186,8 @@ IRAM_ATTR void gap_callback_handler(esp_gap_ble_cb_event_t event,
       // uint8_t *data = esp_ble_resolve_adv_data(p->scan_rst.ble_adv,
       ESP_BLE_AD_TYPE_NAME_CMPL, &len);
 
-      filter BLE devices using their advertisements to get filter alternative to
-      vendor OUI if vendorfiltering is on, we ...
+      filter BLE devices using their advertisements to get filter alternative
+      to vendor OUI if vendorfiltering is on, we ...
       - want to count: mobile phones and tablets
       - don't want to count: beacons, peripherals (earphones, headsets,
       printers), cars and machines see
@@ -211,13 +211,13 @@ IRAM_ATTR void gap_callback_handler(esp_gap_ble_cb_event_t event,
 
   default:
     break;
-  }
+  } // switch
 } // gap_callback_handler
 
 esp_err_t register_ble_callback(void) {
   ESP_LOGI(TAG, "Register GAP callback");
 
-  // This function is called to occur gap event, such as scan result.
+  // This function is called when gap event occurs, such as scan result.
   // register the scan callback function to the gap module
   ESP_ERROR_CHECK(esp_ble_gap_register_callback(&gap_callback_handler));
 
diff --git a/src/corona.cpp b/src/corona.cpp
index caa4d412d..8a2fd979d 100644
--- a/src/corona.cpp
+++ b/src/corona.cpp
@@ -23,18 +23,13 @@ static std::map<uint16_t, unsigned long> cwaSeenNotifiers;
 
 // Remove notifiers last seen over FORGET_AFTER_MINUTES ago.
 void cwa_clear() {
-  /*
-
-    #ifdef SOME_FORM_OF_DEBUG
-  ESP_LOGD(TAG, "CWA: forget old notifier: %d", cwaSeenNotifiers.size());
-    for (auto const &notifier : cwaSeenNotifiers) {
-      ESP_LOGD(TAG, "CWA forget <%X>", notifier.first);
-      //    }
-    }
-  #endif
-
-  */
-
+#ifdef VERBOSE
+  ESP_LOGV(TAG, "CWA: forget old notifier: %d", cwaSeenNotifiers.size());
+  for (auto const &notifier : cwaSeenNotifiers) {
+    ESP_LOGD(TAG, "CWA forget <%04X>", notifier.first);
+    //    }
+  }
+#endif
   // clear everything, otherwise we would count the same device again, as in the
   // next cycle it likely will advertise with a different hash-value
   cwaSeenNotifiers.clear();
diff --git a/src/cyclic.cpp b/src/cyclic.cpp
index 55cb4497d..e65eaac2d 100644
--- a/src/cyclic.cpp
+++ b/src/cyclic.cpp
@@ -40,6 +40,9 @@ void doHousekeeping() {
   ESP_LOGD(TAG, "IRQhandler %d bytes left | Taskstate = %d",
            uxTaskGetStackHighWaterMark(irqHandlerTask),
            eTaskGetState(irqHandlerTask));
+  ESP_LOGD(TAG, "MACprocessor %d bytes left | Taskstate = %d",
+           uxTaskGetStackHighWaterMark(macProcessTask),
+           eTaskGetState(macProcessTask));
 #if (HAS_LORA)
   ESP_LOGD(TAG, "LMiCtask %d bytes left | Taskstate = %d",
            uxTaskGetStackHighWaterMark(lmicTask), eTaskGetState(lmicTask));
diff --git a/src/display.cpp b/src/display.cpp
index 537f71697..7e7e5b384 100644
--- a/src/display.cpp
+++ b/src/display.cpp
@@ -311,6 +311,7 @@ void dp_drawPage(time_t t, bool nextpage) {
     dp_printf("       ");
 #endif
     dp_printf(" ch:%02d", channel);
+    // dp_printf(" due:%02d", rf_load);
     dp_println();
 
     // line 5: RSSI limiter + free memory
diff --git a/src/hal/generic.h b/src/hal/generic.h
index 10db27e97..26d465e3b 100644
--- a/src/hal/generic.h
+++ b/src/hal/generic.h
@@ -105,8 +105,4 @@
 #define LORA_IO1  (33)
 #define LORA_IO2  LMIC_UNUSED_PIN
 
-// I2C config for Microchip 24AA02E64 DEVEUI unique address
-#define MCP_24AA02E64_I2C_ADDRESS 0x50 // I2C address for the 24AA02E64 
-#define MCP_24AA02E64_MAC_ADDRESS 0xF8 // Memory adress of unique deveui 64 bits
-
 #endif
diff --git a/src/lorawan.cpp b/src/lorawan.cpp
index 00f92194f..97865bf67 100644
--- a/src/lorawan.cpp
+++ b/src/lorawan.cpp
@@ -162,51 +162,9 @@ void os_getDevEui(u1_t *buf) {
   } else {
     gen_lora_deveui(buf); // generate DEVEUI from device's MAC
   }
-
-// Get MCP 24AA02E64 hardware DEVEUI (override default settings if found)
-#ifdef MCP_24AA02E64_I2C_ADDRESS
-  get_hard_deveui(buf);
-  RevBytes(buf, 8); // swap bytes to LSB format
-#endif
 #endif
 }
 
-void get_hard_deveui(uint8_t *pdeveui) {
-  // read DEVEUI from Microchip 24AA02E64 2Kb serial eeprom if present
-#ifdef MCP_24AA02E64_I2C_ADDRESS
-
-  uint8_t i2c_ret;
-
-  // Init this just in case, no more to 100KHz
-  Wire.begin(SDA, SCL, 100000);
-  Wire.beginTransmission(MCP_24AA02E64_I2C_ADDRESS);
-  Wire.write(MCP_24AA02E64_MAC_ADDRESS);
-  i2c_ret = Wire.endTransmission();
-
-  // check if device was seen on i2c bus
-  if (i2c_ret == 0) {
-    char deveui[32] = "";
-    uint8_t data;
-
-    Wire.beginTransmission(MCP_24AA02E64_I2C_ADDRESS);
-    Wire.write(MCP_24AA02E64_MAC_ADDRESS);
-    Wire.endTransmission();
-
-    Wire.requestFrom(MCP_24AA02E64_I2C_ADDRESS, 8);
-    while (Wire.available()) {
-      data = Wire.read();
-      sprintf(deveui + strlen(deveui), "%02X ", data);
-      *pdeveui++ = data;
-    }
-    ESP_LOGI(TAG, "Serial EEPROM found, read DEVEUI %s", deveui);
-  } else
-    ESP_LOGI(TAG, "Could not read DEVEUI from serial EEPROM");
-
-  // Set back to 400KHz to speed up OLED
-  Wire.setClock(400000);
-#endif // MCP 24AA02E64
-}
-
 #if (VERBOSE)
 
 // Display OTAA keys
diff --git a/src/macsniff.cpp b/src/macsniff.cpp
index 90f29a79a..798de95f2 100644
--- a/src/macsniff.cpp
+++ b/src/macsniff.cpp
@@ -10,6 +10,9 @@
 // Local logging tag
 static const char TAG[] = __FILE__;
 
+QueueHandle_t MacQueue;
+TaskHandle_t macProcessTask;
+
 uint16_t salt = 0;
 
 uint16_t get_salt(void) {
@@ -43,103 +46,170 @@ uint64_t macConvert(uint8_t *paddr) {
   return (__builtin_bswap64(*mac) >> 16);
 }
 
-uint16_t mac_add(uint8_t *paddr, int8_t rssi, bool sniff_type) {
+esp_err_t macQueueInit() {
+  _ASSERT(MAC_QUEUE_SIZE > 0);
+  MacQueue = xQueueCreate(MAC_QUEUE_SIZE, sizeof(MacBuffer_t));
+  if (MacQueue == 0) {
+    ESP_LOGE(TAG, "Could not create MAC processing queue. Aborting.");
+    return ESP_FAIL;
+  }
+  ESP_LOGI(TAG, "MAC processing queue created, size %d Bytes",
+           MAC_QUEUE_SIZE * sizeof(MacBuffer_t));
+
+  xTaskCreatePinnedToCore(mac_process,     // task function
+                          "mac_process",   // name of task
+                          2048,            // stack size of task
+                          (void *)1,       // parameter of the task
+                          1,               // priority of the task
+                          &macProcessTask, // task handle
+                          1);              // CPU core
+
+  return ESP_OK;
+}
+
+// sniffed MAC processing task
+void mac_process(void *pvParameters) {
+  _ASSERT((uint32_t)pvParameters == 1); // FreeRTOS check
+
+  MacBuffer_t MacBuffer;
+
+  while (1) {
+
+    // fetch next or wait for incoming MAC from sniffing queue
+    if (xQueueReceive(MacQueue, &MacBuffer, portMAX_DELAY) != pdTRUE) {
+      ESP_LOGE(TAG, "Premature return from xQueueReceive() with no data!");
+      continue;
+    }
+
+    // update traffic indicator
+    rf_load = uxQueueMessagesWaiting(MacQueue);
+    // process fetched mac
+    mac_analyze(MacBuffer);
+  }
+  delay(2); // yield to CPU
+}
+
+// enqueue message in MAC processing queue
+void IRAM_ATTR mac_add(uint8_t *paddr, int8_t rssi, snifftype_t sniff_type) {
+
+  MacBuffer_t MacBuffer;
+
+  MacBuffer.rssi = rssi;
+  MacBuffer.sniff_type = sniff_type;
+  memcpy(MacBuffer.mac, paddr, 6);
+
+  if (xQueueSendToBackFromISR(MacQueue, (void *)&MacBuffer, (TickType_t)0) !=
+      pdPASS)
+    ESP_LOGW(TAG, "Dense radio traffic, packet lost!");
+}
+
+uint16_t mac_analyze(MacBuffer_t MacBuffer) {
 
   if (salt == 0) // ensure we have salt (appears after radio is turned on)
     return 0;
 
-  uint16_t hashedmac = 0; // temporary buffer for generated hash value
-  char buff[10];          // temporary buffer for printf
-  bool added = false;
-  int8_t beaconID; // beacon number in test monitor mode
-  uint32_t *mac;   // temporary buffer for shortened MAC
+  if ((cfg.rssilimit) &&
+      (MacBuffer.rssi < cfg.rssilimit)) { // rssi is negative value
+    ESP_LOGI(TAG, "%s RSSI %d -> ignoring (limit: %d)",
+             (MacBuffer.sniff_type == MAC_SNIFF_WIFI) ? "WIFI" : "BLTH",
+             MacBuffer.rssi, cfg.rssilimit);
+    return 0;
+  }
+
+  // in beacon monitor mode check if seen MAC is a known beacon
+  if (cfg.monitormode) {
+    int8_t beaconID = isBeacon(macConvert(MacBuffer.mac));
+    if (beaconID >= 0) {
+      ESP_LOGI(TAG, "Beacon ID#%d detected", beaconID);
+#if (HAS_LED != NOT_A_PIN) || defined(HAS_RGB_LED)
+      blink_LED(COLOR_WHITE, 2000);
+#endif
+      payload.reset();
+      payload.addAlarm(MacBuffer.rssi, beaconID);
+      SendPayload(BEACONPORT, prio_high);
+    }
+  };
+
+#if (VENDORFILTER)
+  uint32_t *oui; // temporary buffer for vendor OUI
+  oui = (uint32_t *)MacBuffer.mac;
+  // if we find OUI on vendor filter list we don't analyze and return early
+  if (std::find(vendors.begin(), vendors.end(), __builtin_bswap32(*oui) >> 8) !=
+      vendors.end())
+    return 0;
+#endif
+
+  char buff[10]; // temporary buffer for printf
+  uint32_t *mac; // temporary buffer for shortened MAC
 
   // only last 3 MAC Address bytes are used for MAC address anonymization
   // but since it's uint32 we take 4 bytes to avoid 1st value to be 0.
   // this gets MAC in msb (= reverse) order, but doesn't matter for hashing it.
-  mac = (uint32_t *)(paddr + 2);
+  mac = (uint32_t *)(MacBuffer.mac + 2);
 
-#if (VENDORFILTER)
-  uint32_t *oui; // temporary buffer for vendor OUI
-  oui = (uint32_t *)paddr;
+  // salt and hash MAC, and if new unique one, store identifier in container
+  // and increment counter on display
+  // https://en.wikipedia.org/wiki/MAC_Address_Anonymization
 
-  // use OUI vendor filter list only on Wifi, not on BLE
-  if ((sniff_type == MAC_SNIFF_BLE) ||
-      std::find(vendors.begin(), vendors.end(), __builtin_bswap32(*oui) >> 8) !=
-          vendors.end()) {
-#endif
+  snprintf(buff, sizeof(buff), "%08X",
+           *mac + (uint32_t)salt); // convert unsigned 32-bit salted MAC
+                                   // to 8 digit hex string
+  uint16_t hashedmac = rokkit(&buff[3], 5); // hash MAC 8 digit -> 5 digit
+  auto newmac = macs.insert(hashedmac);     // add hashed MAC, if new unique
+  bool added =
+      newmac.second ? true : false; // true if hashed MAC is unique in container
+
+  // Count only if MAC was not yet seen
+  if (added) {
 
-    // salt and hash MAC, and if new unique one, store identifier in container
-    // and increment counter on display
-    // https://en.wikipedia.org/wiki/MAC_Address_Anonymization
-
-    snprintf(buff, sizeof(buff), "%08X",
-             *mac + (uint32_t)salt);      // convert unsigned 32-bit salted MAC
-                                          // to 8 digit hex string
-    hashedmac = rokkit(&buff[3], 5);      // hash MAC 8 digit -> 5 digit
-    auto newmac = macs.insert(hashedmac); // add hashed MAC, if new unique
-    added = newmac.second ? true
-                          : false; // true if hashed MAC is unique in container
-
-    // Count only if MAC was not yet seen
-    if (added) {
-      // increment counter and one blink led
-      if (sniff_type == MAC_SNIFF_WIFI) {
-        macs_wifi++; // increment Wifi MACs counter
+    switch (MacBuffer.sniff_type) {
+
+    case MAC_SNIFF_WIFI:
+      macs_wifi++; // increment Wifi MACs counter
 #if (HAS_LED != NOT_A_PIN) || defined(HAS_RGB_LED)
-        blink_LED(COLOR_GREEN, 50);
+      blink_LED(COLOR_GREEN, 50);
 #endif
-      }
+      break;
+
 #if (BLECOUNTER)
-      else if (sniff_type == MAC_SNIFF_BLE) {
-        macs_ble++; // increment BLE Macs counter
+    case MAC_SNIFF_BLE:
+      macs_ble++; // increment BLE Macs counter
 #if (HAS_LED != NOT_A_PIN) || defined(HAS_RGB_LED)
-        blink_LED(COLOR_MAGENTA, 50);
-#endif
-      }
+      blink_LED(COLOR_MAGENTA, 50);
 #endif
+      break;
 
-      // in beacon monitor mode check if seen MAC is a known beacon
-      if (cfg.monitormode) {
-        beaconID = isBeacon(macConvert(paddr));
-        if (beaconID >= 0) {
-          ESP_LOGI(TAG, "Beacon ID#%d detected", beaconID);
+#if (COUNT_ENS)
+    case MAC_SNIFF_BLE_ENS:
+      macs_ble++;             // increment BLE Macs counter
+      cwa_mac_add(hashedmac); // process ENS beacon
 #if (HAS_LED != NOT_A_PIN) || defined(HAS_RGB_LED)
-          blink_LED(COLOR_WHITE, 2000);
+      blink_LED(COLOR_WHITE, 50);
 #endif
-          payload.reset();
-          payload.addAlarm(rssi, beaconID);
-          SendPayload(BEACONPORT, prio_high);
-        }
-      };
-
-    } // added
-
-    // Log scan result
-    ESP_LOGV(TAG,
-             "%s %s RSSI %ddBi -> salted MAC %s -> Hash %04X -> WiFi:%d  "
-             "BLTH:%d "
+      break;
+
+#endif // COUNT_ENS
+#endif // BLECOUNTER
+
+    } // switch
+  }   // added
+
+  // Log scan result
+  ESP_LOGV(TAG,
+           "%s %s RSSI %ddBi -> salted MAC %s -> Hash %04X -> WiFi:%d  "
+           "BLTH:%d "
 #if (COUNT_ENS)
-             "(CWA:%d)"
+           "(CWA:%d)"
 #endif
-             "-> %d Bytes left",
-             added ? "new  " : "known",
-             sniff_type == MAC_SNIFF_WIFI ? "WiFi" : "BLTH", rssi, buff,
-             hashedmac, macs_wifi, macs_ble,
+           "-> %d Bytes left",
+           added ? "new  " : "known",
+           MacBuffer.sniff_type == MAC_SNIFF_WIFI ? "WiFi" : "BLTH",
+           MacBuffer.rssi, buff, hashedmac, macs_wifi, macs_ble,
 #if (COUNT_ENS)
-             cwa_report(),
+           cwa_report(),
 #endif
-             getFreeRAM());
+           getFreeRAM());
 
-#if (VENDORFILTER)
-  } else {
-    // Very noisy
-    // ESP_LOGD(TAG, "Filtered MAC %02X:%02X:%02X:%02X:%02X:%02X",
-    // paddr[0],paddr[1],paddr[2],paddr[3],paddr[5],paddr[5]);
-  }
-#endif
-
-  // if a new and unique Wifi or BLE mac was counted, returs hash of this mac,
-  // else 0
-  return hashedmac;
-}
+  // if an unknown Wifi or BLE mac was counted, return hash of this mac, else 0
+  return (added ? hashedmac : 0);
+}
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index cabfa1e7b..687a926da 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -35,9 +35,10 @@ IDLE          0     0     ESP32 arduino scheduler -> runs wifi sniffer
 lmictask      1     2     MCCI LMiC LORAWAN stack
 clockloop     1     4     generates realtime telegrams for external clock
 timesync_proc 1     3     processes realtime time sync requests
-irqhandler    1     1     cyclic tasks (i.e. displayrefresh) triggered by timers
+irqhandler    1     2     cyclic tasks (i.e. displayrefresh) triggered by timers
 gpsloop       1     1     reads data from GPS via serial or i2c
 lorasendtask  1     1     feeds data from lora sendqueue to lmcic
+macprocess    1     1     analyzes sniffed MACs
 IDLE          1     0     ESP32 arduino scheduler -> runs wifi channel rotator
 
 Low priority numbers denote low priority tasks.
@@ -86,8 +87,9 @@ 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 channel = 0;           // channel rotation counter
+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;
@@ -285,6 +287,10 @@ void setup() {
     start_ota_update();
 #endif
 
+  // start mac processing task
+  ESP_LOGI(TAG, "Starting MAC processor...");
+  macQueueInit();
+
 // start BLE scan callback if BLE function is enabled in NVRAM configuration
 // or switch off bluetooth, if not compiled
 #if (BLECOUNTER)
@@ -344,7 +350,7 @@ void setup() {
   strcat_P(features, " LORA");
   // kick off join, except we come from sleep
   _ASSERT(lora_stack_init(RTC_runmode == RUNMODE_WAKEUP ? false : true) ==
-         ESP_OK);
+          ESP_OK);
 #endif
 
 // initialize SPI
@@ -490,12 +496,9 @@ void setup() {
   sendTimer.attach(cfg.sendcycle * 2, setSendIRQ);
   cyclicTimer.attach(HOMECYCLE, setCyclicIRQ);
 
-#if (TIME_SYNC_INTERVAL)
-
-#if (!(TIME_SYNC_LORAWAN) && !(TIME_SYNC_LORASERVER) && !defined HAS_GPS &&    \
-     !defined HAS_RTC)
-#warning you did not specify a time source, time will not be synched
-#endif
+// only if we have a timesource we do timesync
+#if ((TIME_SYNC_LORAWAN) || (TIME_SYNC_LORASERVER) || (HAS_GPS) ||             \
+     defined HAS_RTC)
 
 #if (defined HAS_IF482 || defined HAS_DCF77)
   ESP_LOGI(TAG, "Starting Clock Controller...");
@@ -508,9 +511,10 @@ void setup() {
 
   ESP_LOGI(TAG, "Starting Timekeeper...");
   _ASSERT(timepulse_init()); // setup pps timepulse
-  timepulse_start();        // starts pps and cyclic time sync
+  timepulse_start();         // starts pps and cyclic time sync
+  strcat_P(features, " TIME");
 
-#endif // TIME_SYNC_INTERVAL
+#endif // timesync
 
   // show compiled features
   ESP_LOGI(TAG, "Features:%s", features);
diff --git a/src/paxcounter_orig.conf b/src/paxcounter_orig.conf
index 06a1e624e..0a7b88d1e 100644
--- a/src/paxcounter_orig.conf
+++ b/src/paxcounter_orig.conf
@@ -14,10 +14,11 @@
 #define PAYLOAD_ENCODER                 2       // payload encoder: 1=Plain, 2=Packed, 3=Cayenne LPP dynamic, 4=Cayenne LPP packed
 #define COUNTERMODE                     0       // 0=cyclic, 1=cumulative, 2=cyclic confirmed
 
-// Set this to include BLE counting and vendor filter functions, or to switch off WIFI counting
+// MAC sniffing parameters
 #define VENDORFILTER                    0       // set to 0 if you want to scan all devices, not filtering smartphone OUIs
 #define BLECOUNTER                      0       // set to 0 if you do not want to install the BLE sniffer
 #define WIFICOUNTER                     1       // set to 0 if you do not want to install the WIFI sniffer
+#define MAC_QUEUE_SIZE                  50      // size of MAC processing buffer (number of MACs) [default = 50]
 
 // BLE scan parameters
 #define BLESCANTIME                     0       // [seconds] scan duration, 0 means infinite [default], see note below
@@ -29,10 +30,9 @@
                                                 // set to 0 if you do not want to enable this function
 
 // for additional sensors (added by some user)
-#define HAS_SENSOR_1                    0      // set to 1 if you want to transmit CWA counter
-#define HAS_SENSOR_2                    0       // not used 
-#define HAS_SENSOR_3                    0       // not used
-#define HAS_SENSORS     (HAS_SENSOR_1 || HAS_SENSOR_2 || HAS_SENSOR_3)   // to simplify things
+#define HAS_SENSOR_1                    0       // set to 1 to enable data transfer of user sensor #1 (also used as ENS counter) [default=0]
+#define HAS_SENSOR_2                    0       // set to 1 to enable data transfer of user sensor #2 [default=0]
+#define HAS_SENSOR_3                    0       // set to 1 to enable data transfer of user sensor #3 [default=0]
 
 /* Note: guide for setting bluetooth parameters
 *
diff --git a/src/sensor.cpp b/src/sensor.cpp
index b3f564402..559fd60d0 100644
--- a/src/sensor.cpp
+++ b/src/sensor.cpp
@@ -57,7 +57,7 @@ uint8_t *sensor_read(uint8_t sensor) {
     // note: Sensor1 fields are used for ENS count, if ENS detection enabled
 #if (COUNT_ENS)
     if (cfg.enscount)
-      payload.addCount(cwa_report(), MAC_SNIFF_BLE_CWA);
+      payload.addCount(cwa_report(), MAC_SNIFF_BLE_ENS);
 #else
     buf[0] = length;
     buf[1] = 0x01;
diff --git a/src/wifiscan.cpp b/src/wifiscan.cpp
index dd8ce4a10..d6325fcdd 100644
--- a/src/wifiscan.cpp
+++ b/src/wifiscan.cpp
@@ -26,7 +26,7 @@ typedef struct {
   uint8_t payload[0]; // network data ended with 4 bytes csum (CRC32)
 } wifi_ieee80211_packet_t;
 
-// using IRAM_:ATTR here to speed up callback function
+// using IRAM_ATTR here to speed up callback function
 IRAM_ATTR void wifi_sniffer_packet_handler(void *buff,
                                            wifi_promiscuous_pkt_type_t type) {
 
@@ -35,16 +35,13 @@ IRAM_ATTR void wifi_sniffer_packet_handler(void *buff,
       (wifi_ieee80211_packet_t *)ppkt->payload;
   const wifi_ieee80211_mac_hdr_t *hdr = &ipkt->hdr;
 
-  if ((cfg.rssilimit) &&
-      (ppkt->rx_ctrl.rssi < cfg.rssilimit)) // rssi is negative value
-    ESP_LOGD(TAG, "WiFi RSSI %d -> ignoring (limit: %d)", ppkt->rx_ctrl.rssi,
-             cfg.rssilimit);
-  else // count seen MAC
-    mac_add((uint8_t *)hdr->addr2, ppkt->rx_ctrl.rssi, MAC_SNIFF_WIFI);
+  // process seen MAC
+  mac_add((uint8_t *)hdr->addr2, ppkt->rx_ctrl.rssi, MAC_SNIFF_WIFI);
 }
 
 // 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