diff --git a/Kconfig b/Kconfig
index e4dd4d9..b73c604 100644
--- a/Kconfig
+++ b/Kconfig
@@ -14,16 +14,19 @@ config TTN_LORA_FREQ_EU_868
     bool "Europe (868 MHz)"
 
 config TTN_LORA_FREQ_US_915
-    bool "North America (915 Mhz)"
+    bool "North America (915 MHz)"
 
 config TTN_LORA_FREQ_AU_921
-    bool "Australia (921 Mhz)"
+    bool "Australia (921 MHz)"
 
 config TTN_LORA_FREQ_AS_923
-    bool "Asia (923 Mhz)"
+    bool "Asia (923 MHz)"
+
+config TTN_LORA_FREQ_AS_923_JP
+    bool "Asia, region Japan (923 MHz)"
 
 config TTN_LORA_FREQ_IN_866
-    bool "India (866 Mhz)"
+    bool "India (866 MHz)"
 
 endchoice
 
@@ -79,22 +82,22 @@ config TTN_BG_TASK_PRIO
 
 
 choice TTN_PROVISION_UART
-    prompt "UART for provisioning"
+    prompt "AT commands"
     default TTN_PROVISION_UART_DEFAULT
     help
-        Select whether to use UART for listening for provisioning commands.
+        Select whether to listen on UART for AT commands.
         
         - Default is to use UART0 on pins GPIO1(TX) and GPIO3(RX).
         - If "Custom" is selected, UART0 or UART1 can be chosen,
           and any pins can be selected.
-        - If "None" is selected, the feature is not available.
+        - If "None" is selected, AT commands are not available.
 
 config TTN_PROVISION_UART_DEFAULT
-    bool "Default: UART0, TX=GPIO1, RX=GPIO3, 115,200 baud"
+    bool "Enabled - default settings: UART0, TX=GPIO1, RX=GPIO3, 115,200 baud"
 config TTN_PROVISION_UART_CUSTOM
-    bool "Custom"
+    bool "Enabled - custom UART settings"
 config TTN_PROVISION_UART_NONE
-    bool "None"
+    bool "Disabled"
 endchoice
 
 choice TTN_PROVISION_UART_NUM
diff --git a/esp_idf_lmic_config.h b/esp_idf_lmic_config.h
index 0fc57cd..f5d862d 100755
--- a/esp_idf_lmic_config.h
+++ b/esp_idf_lmic_config.h
@@ -20,6 +20,9 @@
 #define CFG_au921 1
 #elif defined(CONFIG_TTN_LORA_FREQ_AS_923)
 #define CFG_as923 1
+#elif defined(CONFIG_TTN_LORA_FREQ_AS_923_JP)
+#define CFG_as923 1
+#define LMIC_COUNTRY_CODE LMIC_COUNTRY_CODE_JP
 #elif defined(CONFIG_TTN_LORA_FREQ_IN_866)
 #define CFG_in866 1
 #else
@@ -55,6 +58,14 @@
 #error TTN timer must be configured using 'make menuconfig'
 #endif
 
+#if !defined(CONFIG_TTN_PROVISION_UART_NONE)
+#define TTN_HAS_AT_COMMANDS 1
+#if defined(CONFIG_TTN_PROVISION_UART_CONFIG_YES)
+#define TTN_CONFIG_UART 1
+#endif
+#endif
+
+
 // 16 μs per tick
 // LMIC requires ticks to be 15.5μs - 100 μs long
 #define US_PER_OSTICK 16
diff --git a/include/TheThingsNetwork.h b/include/TheThingsNetwork.h
index ea857f7..59b48f1 100644
--- a/include/TheThingsNetwork.h
+++ b/include/TheThingsNetwork.h
@@ -130,7 +130,7 @@ public:
     bool provisionWithMAC(const char *appEui, const char *appKey);
 
     /**
-     * @brief Start task that listens on configured UART for provisioning commands.
+     * @brief Start task that listens on configured UART for AT commands.
      * 
      * Run 'make menuconfig' to configure it.
      */
diff --git a/src/TTNProvisioning.cpp b/src/TTNProvisioning.cpp
index 5e4cdba..0efdb8e 100644
--- a/src/TTNProvisioning.cpp
+++ b/src/TTNProvisioning.cpp
@@ -20,7 +20,7 @@
 #include "lmic/lmic.h"
 #include "hal/hal_esp32.h"
 
-#if !defined(CONFIG_TTN_PROVISION_UART_NONE)
+#if defined(TTN_HAS_AT_COMMANDS)
 const uart_port_t UART_NUM = (uart_port_t) CONFIG_TTN_PROVISION_UART_NUM;
 const int MAX_LINE_LENGTH = 128;
 #endif
@@ -35,7 +35,10 @@ static uint8_t global_dev_eui[8];
 static uint8_t global_app_eui[8];
 static uint8_t global_app_key[16];
 
+
+#if defined(TTN_HAS_AT_COMMANDS)
 void ttn_provisioning_task_caller(void* pvParameter);
+#endif
 
 
 // --- LMIC callbacks
@@ -67,7 +70,7 @@ void os_getDevKey (u1_t* buf)
 
 TTNProvisioning::TTNProvisioning()
     : have_keys(false)
-#if !defined(CONFIG_TTN_PROVISION_UART_NONE)
+#if defined(TTN_HAS_AT_COMMANDS)
         , uart_queue(nullptr), line_buf(nullptr), line_length(0), last_line_end_char(0), quit_task(false)
 #endif
 {
@@ -76,9 +79,11 @@ TTNProvisioning::TTNProvisioning()
 
 // --- Provisioning task
 
+#if defined(TTN_HAS_AT_COMMANDS)
+
 void TTNProvisioning::startTask()
 {
-#if defined(CONFIG_TTN_PROVISION_UART_CONFIG_YES)
+#if defined(TTN_CONFIG_UART)
     configUART();
 #endif
 
@@ -287,7 +292,10 @@ void TTNProvisioning::processLine()
     uart_write_bytes(UART_NUM, is_ok ? "OK\r\n" : "ERROR\r\n", is_ok ? 4 : 7);
 }
 
-#if defined(CONFIG_TTN_PROVISION_UART_CONFIG_YES)
+#endif
+
+
+#if defined(TTN_CONFIG_UART)
 
 void TTNProvisioning::configUART()
 {
diff --git a/src/TTNProvisioning.h b/src/TTNProvisioning.h
index 4d6a60b..30fd9f9 100644
--- a/src/TTNProvisioning.h
+++ b/src/TTNProvisioning.h
@@ -22,23 +22,29 @@ class TTNProvisioning
 public:
     TTNProvisioning();
 
-    void startTask();
     bool haveKeys();
     bool decodeKeys(const char *dev_eui, const char *app_eui, const char *app_key);
     bool fromMAC(const char *app_eui, const char *app_key);
     bool saveKeys();
     bool restoreKeys(bool silent);
 
+#if defined(TTN_HAS_AT_COMMANDS)
+    void startTask();
+#endif
+
 private:
-    void provisioningTask();
     bool decode(bool incl_dev_eui, const char *dev_eui, const char *app_eui, const char *app_key);
-    void addLineData(int numBytes);
-    void detectLineEnd(int start_at);
-    void processLine();
     bool readNvsValue(nvs_handle handle, const char* key, uint8_t* data, size_t expected_length, bool silent);
     bool writeNvsValue(nvs_handle handle, const char* key, const uint8_t* data, size_t len);
 
-#if defined(CONFIG_TTN_PROVISION_UART_CONFIG_YES)
+#if defined(TTN_HAS_AT_COMMANDS)
+    void provisioningTask();
+    void addLineData(int numBytes);
+    void detectLineEnd(int start_at);
+    void processLine();
+#endif
+
+#if defined(TTN_CONFIG_UART)
     void configUART();
 #endif
 
@@ -53,15 +59,15 @@ private:
 private:
     bool have_keys = false;
 
-#if !defined(CONFIG_TTN_PROVISION_UART_NONE)
+#if defined(TTN_HAS_AT_COMMANDS)
     QueueHandle_t uart_queue;
     char* line_buf;
     int line_length;
     uint8_t last_line_end_char;
     bool quit_task;
-#endif
 
     friend void ttn_provisioning_task_caller(void* pvParameter);
+#endif
 };
 
 #endif
diff --git a/src/TheThingsNetwork.cpp b/src/TheThingsNetwork.cpp
index 1181919..331b1bd 100644
--- a/src/TheThingsNetwork.cpp
+++ b/src/TheThingsNetwork.cpp
@@ -93,16 +93,21 @@ bool TheThingsNetwork::provisionWithMAC(const char *appEui, const char *appKey)
     return provisioning.saveKeys();
 }
 
+
 void TheThingsNetwork::startProvisioningTask()
 {
-#if !defined(CONFIG_TTN_PROVISION_UART_NONE)
+#if defined(TTN_HAS_AT_COMMANDS)
     provisioning.startTask();
+#else
+    ESP_LOGE(TAG, "AT commands are disabled. Change the configuration using 'make menuconfig'");
+    ASSERT(0);
+    esp_restart();
 #endif
 }
 
 void TheThingsNetwork::waitForProvisioning()
 {
-#if !defined(CONFIG_TTN_PROVISION_UART_NONE)
+#if defined(TTN_HAS_AT_COMMANDS)
     if (isProvisioned())
     {
         ESP_LOGI(TAG, "Device is already provisioned");
@@ -113,6 +118,10 @@ void TheThingsNetwork::waitForProvisioning()
         vTaskDelay(1000 / portTICK_PERIOD_MS);
 
     ESP_LOGI(TAG, "Device successfully provisioned");
+#else
+    ESP_LOGE(TAG, "AT commands are disabled. Change the configuration using 'make menuconfig'");
+    ASSERT(0);
+    esp_restart();
 #endif
 }