diff --git a/include/led.h b/include/led.h
index 2631563c..6527e879 100644
--- a/include/led.h
+++ b/include/led.h
@@ -37,5 +37,8 @@ extern TaskHandle_t ledLoopTask;
 void rgb_set_color(uint16_t hue);
 void blink_LED(uint16_t set_color, uint16_t set_blinkduration);
 void ledLoop(void *parameter);
+#if (HAS_LED != NOT_A_PIN)
+void switch_LED(uint8_t state);
+#endif
 
 #endif
\ No newline at end of file
diff --git a/include/main.h b/include/main.h
index 9c74aef5..f7284720 100644
--- a/include/main.h
+++ b/include/main.h
@@ -12,5 +12,6 @@
 #include "beacon_array.h"
 #include "ota.h"
 #include "irqhandler.h"
+#include "led.h"
 
 #endif
\ No newline at end of file
diff --git a/include/spisend.h b/include/spisend.h
index 750a3c20..70cc4437 100644
--- a/include/spisend.h
+++ b/include/spisend.h
@@ -1,9 +1,34 @@
 #ifndef _SPISEND_H
 #define _SPISEND_H
 
+#include "globals.h"
+#include "spi.h"
+
 extern TaskHandle_t SpiTask;
 extern QueueHandle_t SPISendQueue;
 
+/*
+ * Process data in SPI send queue
+ */
 void spi_loop(void *pvParameters);
 
+/*
+* initialize local SPI wire interface
+*/
+void hal_spi_init();
+
+/*
+ * Perform SPI write transaction on local SPI wire interface
+ *   - write the command byte 'cmd'
+ *   - write 'len' bytes out of 'buf'
+ */
+void hal_spi_write(uint8_t cmd, const uint8_t* buf, int len);
+
+/*
+ * Perform SPI read transaction on local SPI wire interface
+ *   - read the command byte 'cmd'
+ *   - read 'len' bytes into 'buf'
+ */
+void hal_spi_read(uint8_t cmd, uint8_t* buf, int len);
+
 #endif
\ No newline at end of file
diff --git a/lib/arduino-lmic-master/.gitignore b/lib/arduino-lmic-mcci-v2.2.2/.gitignore
similarity index 100%
rename from lib/arduino-lmic-master/.gitignore
rename to lib/arduino-lmic-mcci-v2.2.2/.gitignore
diff --git a/lib/arduino-lmic-master/.hgignore b/lib/arduino-lmic-mcci-v2.2.2/.hgignore
similarity index 100%
rename from lib/arduino-lmic-master/.hgignore
rename to lib/arduino-lmic-mcci-v2.2.2/.hgignore
diff --git a/lib/arduino-lmic-master/HOWTO-ADD-REGION.md b/lib/arduino-lmic-mcci-v2.2.2/HOWTO-ADD-REGION.md
similarity index 100%
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rename to lib/arduino-lmic-mcci-v2.2.2/HOWTO-ADD-REGION.md
diff --git a/lib/arduino-lmic-master/LICENSE b/lib/arduino-lmic-mcci-v2.2.2/LICENSE
similarity index 100%
rename from lib/arduino-lmic-master/LICENSE
rename to lib/arduino-lmic-mcci-v2.2.2/LICENSE
diff --git a/lib/arduino-lmic-master/README.md b/lib/arduino-lmic-mcci-v2.2.2/README.md
similarity index 100%
rename from lib/arduino-lmic-master/README.md
rename to lib/arduino-lmic-mcci-v2.2.2/README.md
diff --git a/lib/arduino-lmic-master/doc/LMiC-v1.6.docx b/lib/arduino-lmic-mcci-v2.2.2/doc/LMiC-v1.6.docx
similarity index 100%
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rename to lib/arduino-lmic-mcci-v2.2.2/doc/LMiC-v1.6.docx
diff --git a/lib/arduino-lmic-master/doc/LMiC-v1.6.pdf b/lib/arduino-lmic-mcci-v2.2.2/doc/LMiC-v1.6.pdf
similarity index 100%
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rename to lib/arduino-lmic-mcci-v2.2.2/doc/LMiC-v1.6.pdf
diff --git a/lib/arduino-lmic-master/doc/README.txt b/lib/arduino-lmic-mcci-v2.2.2/doc/README.txt
similarity index 100%
rename from lib/arduino-lmic-master/doc/README.txt
rename to lib/arduino-lmic-mcci-v2.2.2/doc/README.txt
diff --git a/lib/arduino-lmic-master/doc/release-notes.txt b/lib/arduino-lmic-mcci-v2.2.2/doc/release-notes.txt
similarity index 100%
rename from lib/arduino-lmic-master/doc/release-notes.txt
rename to lib/arduino-lmic-mcci-v2.2.2/doc/release-notes.txt
diff --git a/lib/arduino-lmic-master/library.properties b/lib/arduino-lmic-mcci-v2.2.2/library.properties
similarity index 100%
rename from lib/arduino-lmic-master/library.properties
rename to lib/arduino-lmic-mcci-v2.2.2/library.properties
diff --git a/lib/arduino-lmic-master/src/aes/ideetron/AES-128_V10.cpp b/lib/arduino-lmic-mcci-v2.2.2/src/aes/ideetron/AES-128_V10.cpp
similarity index 100%
rename from lib/arduino-lmic-master/src/aes/ideetron/AES-128_V10.cpp
rename to lib/arduino-lmic-mcci-v2.2.2/src/aes/ideetron/AES-128_V10.cpp
diff --git a/lib/arduino-lmic-master/src/aes/lmic.c b/lib/arduino-lmic-mcci-v2.2.2/src/aes/lmic.c
similarity index 100%
rename from lib/arduino-lmic-master/src/aes/lmic.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/aes/lmic.c
diff --git a/lib/arduino-lmic-master/src/aes/other.c b/lib/arduino-lmic-mcci-v2.2.2/src/aes/other.c
similarity index 100%
rename from lib/arduino-lmic-master/src/aes/other.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/aes/other.c
diff --git a/lib/arduino-lmic-master/src/hal/hal.cpp b/lib/arduino-lmic-mcci-v2.2.2/src/hal/hal.cpp
similarity index 100%
rename from lib/arduino-lmic-master/src/hal/hal.cpp
rename to lib/arduino-lmic-mcci-v2.2.2/src/hal/hal.cpp
diff --git a/lib/arduino-lmic-master/src/hal/hal.h b/lib/arduino-lmic-mcci-v2.2.2/src/hal/hal.h
similarity index 100%
rename from lib/arduino-lmic-master/src/hal/hal.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/hal/hal.h
diff --git a/lib/arduino-lmic-master/src/lmic.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic.h
diff --git a/lib/arduino-lmic-master/src/lmic/config.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/config.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/config.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/config.h
diff --git a/lib/arduino-lmic-master/src/lmic/hal.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/hal.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/hal.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/hal.h
diff --git a/lib/arduino-lmic-master/src/lmic/lmic.c b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic.c
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic.c
diff --git a/lib/arduino-lmic-master/src/lmic/lmic.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic.h
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_as923.c b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_as923.c
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_as923.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_as923.c
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_au921.c b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_au921.c
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_au921.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_au921.c
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_bandplan.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_bandplan.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_bandplan.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_bandplan.h
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_bandplan_as923.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_bandplan_as923.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_bandplan_as923.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_bandplan_as923.h
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_bandplan_au921.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_bandplan_au921.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_bandplan_au921.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_bandplan_au921.h
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_bandplan_eu868.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_bandplan_eu868.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_bandplan_eu868.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_bandplan_eu868.h
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_bandplan_in866.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_bandplan_in866.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_bandplan_in866.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_bandplan_in866.h
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_bandplan_us915.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_bandplan_us915.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_bandplan_us915.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_bandplan_us915.h
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_config_preconditions.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_config_preconditions.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_config_preconditions.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_config_preconditions.h
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_eu868.c b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_eu868.c
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_eu868.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_eu868.c
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_eu_like.c b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_eu_like.c
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_eu_like.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_eu_like.c
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_eu_like.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_eu_like.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_eu_like.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_eu_like.h
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_in866.c b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_in866.c
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_in866.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_in866.c
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_us915.c b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_us915.c
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_us915.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_us915.c
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_us_like.c b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_us_like.c
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_us_like.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_us_like.c
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_us_like.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_us_like.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_us_like.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_us_like.h
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_util.c b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_util.c
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_util.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_util.c
diff --git a/lib/arduino-lmic-master/src/lmic/lmic_util.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_util.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lmic_util.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lmic_util.h
diff --git a/lib/arduino-lmic-master/src/lmic/lorabase.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lorabase.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lorabase.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lorabase.h
diff --git a/lib/arduino-lmic-master/src/lmic/lorabase_as923.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lorabase_as923.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lorabase_as923.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lorabase_as923.h
diff --git a/lib/arduino-lmic-master/src/lmic/lorabase_au921.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lorabase_au921.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lorabase_au921.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lorabase_au921.h
diff --git a/lib/arduino-lmic-master/src/lmic/lorabase_eu868.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lorabase_eu868.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lorabase_eu868.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lorabase_eu868.h
diff --git a/lib/arduino-lmic-master/src/lmic/lorabase_in866.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lorabase_in866.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lorabase_in866.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lorabase_in866.h
diff --git a/lib/arduino-lmic-master/src/lmic/lorabase_us915.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/lorabase_us915.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/lorabase_us915.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/lorabase_us915.h
diff --git a/lib/arduino-lmic-master/src/lmic/oslmic.c b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/oslmic.c
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/oslmic.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/oslmic.c
diff --git a/lib/arduino-lmic-master/src/lmic/oslmic.h b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/oslmic.h
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/oslmic.h
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/oslmic.h
diff --git a/lib/arduino-lmic-master/src/lmic/radio.c b/lib/arduino-lmic-mcci-v2.2.2/src/lmic/radio.c
similarity index 100%
rename from lib/arduino-lmic-master/src/lmic/radio.c
rename to lib/arduino-lmic-mcci-v2.2.2/src/lmic/radio.c
diff --git a/platformio.ini b/platformio.ini
index e0ccb21c..a21e5d4a 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -29,7 +29,7 @@ description = Paxcounter is a proof-of-concept ESP32 device for metering passeng
 
 [common]
 ; for release_version use max. 10 chars total, use any decimal format like "a.b.c"
-release_version = 1.6.51
+release_version = 1.6.54
 ; 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 = 0
diff --git a/src/hal/heltecv2.h b/src/hal/heltecv2.h
index a97a6d3c..6d48f05f 100644
--- a/src/hal/heltecv2.h
+++ b/src/hal/heltecv2.h
@@ -25,7 +25,7 @@
 #define LORA_MOSI (27)
 #define LORA_RST  (14)
 #define LORA_IO0  (26)
-#define LORA_IO1  (34)
-#define LORA_IO2  (35)
+#define LORA_IO1  (35)
+#define LORA_IO2  (34)
 
 #endif
\ No newline at end of file
diff --git a/src/led.cpp b/src/led.cpp
index 76195523..8e3b7ed8 100644
--- a/src/led.cpp
+++ b/src/led.cpp
@@ -87,6 +87,28 @@ void rgb_set_color(uint16_t hue) {}
 
 #endif
 
+#if (HAS_LED != NOT_A_PIN)
+
+void switch_LED(uint8_t state) {
+  if (state == LED_ON) {
+    // switch LED on
+#ifdef LED_ACTIVE_LOW
+    digitalWrite(HAS_LED, LOW);
+#else
+    digitalWrite(HAS_LED, HIGH);
+#endif
+  } else if (state == LED_OFF) {
+    // switch LED off
+#ifdef LED_ACTIVE_LOW
+    digitalWrite(HAS_LED, HIGH);
+#else
+    digitalWrite(HAS_LED, LOW);
+#endif
+  }
+}
+
+#endif
+
 #if (HAS_LED != NOT_A_PIN) || defined(HAS_RGB_LED)
 
 void blink_LED(uint16_t set_color, uint16_t set_blinkduration) {
@@ -98,7 +120,8 @@ void blink_LED(uint16_t set_color, uint16_t set_blinkduration) {
 
 void ledLoop(void *parameter) {
   while (1) {
-    // Custom blink running always have priority other LoRaWAN led management
+    // Custom blink running always have priority other LoRaWAN led
+    // management
     if (LEDBlinkStarted && LEDBlinkDuration) {
       // Custom blink is finished, let this order, avoid millis() overflow
       if ((millis() - LEDBlinkStarted) >= LEDBlinkDuration) {
@@ -154,20 +177,14 @@ void ledLoop(void *parameter) {
     if (LEDState != previousLEDState) {
       if (LEDState == LED_ON) {
         rgb_set_color(LEDColor);
-
-#ifdef LED_ACTIVE_LOW
-        digitalWrite(HAS_LED, LOW);
-#else
-        digitalWrite(HAS_LED, HIGH);
+        // if we have only single LED we use it to blink for status
+#ifndef HAS_RGB_LED
+        switch_LED(LED_ON);
 #endif
-
       } else {
         rgb_set_color(COLOR_NONE);
-
-#ifdef LED_ACTIVE_LOW
-        digitalWrite(HAS_LED, HIGH);
-#else
-        digitalWrite(HAS_LED, LOW);
+#ifndef HAS_RGB_LED
+        switch_LED(LED_OFF);
 #endif
       }
       previousLEDState = LEDState;
diff --git a/src/main.cpp b/src/main.cpp
index 1cceb71f..af5fdd4c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -96,7 +96,12 @@ void setup() {
 #if (HAS_LED != NOT_A_PIN)
   pinMode(HAS_LED, OUTPUT);
   strcat_P(features, " LED");
+// switch on power LED if we have 2 LEDs, else use it for status
+#ifdef HAS_RGB_LED
+  switch_LED(LED_ON);
 #endif
+#endif
+
 #ifdef HAS_RGB_LED
   rgb_set_color(COLOR_PINK);
   strcat_P(features, " RGB");
diff --git a/src/payload.cpp b/src/payload.cpp
index 38c2df76..a1d6e580 100644
--- a/src/payload.cpp
+++ b/src/payload.cpp
@@ -48,6 +48,7 @@ void PayloadConvert::addConfig(configData_t value) {
   buffer[cursor++] = value.vendorfilter;
   buffer[cursor++] = value.rgblum;
   buffer[cursor++] = value.gpsmode;
+  buffer[cursor++] = value.monitormode;
   memcpy(buffer + cursor, value.version, 10);
   cursor += 10;
 }
diff --git a/src/rcommand.cpp b/src/rcommand.cpp
index ab82deaa..37460d86 100644
--- a/src/rcommand.cpp
+++ b/src/rcommand.cpp
@@ -105,7 +105,10 @@ void set_countmode(uint8_t val[]) {
     ESP_LOGW(
         TAG,
         "Remote command: set counter mode called with invalid parameter(s)");
+    return;
   }
+  reset_counters(); // clear macs
+  get_salt();       // get new salt
 }
 
 void set_screensaver(uint8_t val[]) {
diff --git a/src/spisend.cpp b/src/spisend.cpp
index 57da9287..6d28f5a8 100644
--- a/src/spisend.cpp
+++ b/src/spisend.cpp
@@ -1,6 +1,6 @@
 #ifdef HAS_SPI
 
-#include "globals.h"
+#include "spisend.h"
 
 // Local logging tag
 static const char TAG[] = "main";
@@ -13,18 +13,60 @@ TaskHandle_t SpiTask;
 // SPI feed Task
 void spi_loop(void *pvParameters) {
 
+  uint8_t buf[32];
+
   configASSERT(((uint32_t)pvParameters) == 1); // FreeRTOS check
 
   while (1) {
+    // check if data to send on SPI interface
     if (xQueueReceive(SPISendQueue, &SendBuffer, (TickType_t)0) == pdTRUE) {
+      hal_spi_write(SendBuffer.MessagePort, SendBuffer.Message,
+                    SendBuffer.MessageSize);
       ESP_LOGI(TAG, "%d bytes sent to SPI", SendBuffer.MessageSize);
     }
-    vTaskDelay(2 / portTICK_PERIOD_MS); // yield to CPU
 
-  } // end of infinite loop
+    // check if command is received on SPI command port, then call interpreter
+    hal_spi_read(RCMDPORT, buf, 32);
+    if (buf[0])
+      rcommand(buf, sizeof(buf));
+
+    vTaskDelay(2 / portTICK_PERIOD_MS); // yield to CPU
+  }                                     // end of infinite loop
 
   vTaskDelete(NULL); // shoud never be reached
 
 } // spi_loop()
 
+// SPI hardware abstraction layer
+
+void hal_spi_init() { SPI.begin(SCK, MISO, MOSI, SS); }
+
+void hal_spi_trx(uint8_t port, uint8_t *buf, int len, uint8_t is_read) {
+
+  SPISettings settings(1E6, MSBFIRST, SPI_MODE0);
+  SPI.beginTransaction(settings);
+  digitalWrite(SS, 0);
+
+  SPI.transfer(port);
+
+  for (uint8_t i = 0; i < len; i++) {
+    uint8_t *p = buf + i;
+    uint8_t data = is_read ? 0x00 : *p;
+    data = SPI.transfer(data);
+    if (is_read)
+      *p = data;
+  }
+
+  digitalWrite(SS, 1);
+  SPI.endTransaction();
+}
+
+void hal_spi_write(uint8_t port, const uint8_t *buf, int len) {
+  hal_spi_trx(port, (uint8_t *)buf, len, 0);
+}
+
+void hal_spi_read(uint8_t port, uint8_t *buf, int len) {
+  hal_spi_trx(port, buf, len, 1);
+}
+
 #endif // HAS_SPI
\ No newline at end of file