Add more regions, disable class B features

Kconfig

@@ -1,7 +1,7 @@
 menu "The Things Network"
 
 choice TTN_LORA_FREQ
-    prompt "TTN LoRa frequency"
+    prompt "TTN LoRa frequency / region"
     default TTN_LORA_FREQ_DISABLED
     help
         LoRa frequency must match the geographic region the device is operated in.
@@ -11,10 +11,19 @@ config TTN_LORA_FREQ_DISABLED
     bool "LoRa Disabled"
 
 config TTN_LORA_FREQ_EU_868
-    bool "868 MHz (Europe)"
+    bool "Europe (868 MHz)"
 
 config TTN_LORA_FREQ_US_915
-    bool "915 Mhz (North America)"
+    bool "North America (915 Mhz)"
+
+config TTN_LORA_FREQ_AU_921
+    bool "Australia (921 Mhz)"
+
+config TTN_LORA_FREQ_AS_923
+    bool "Asia (923 Mhz)"
+
+config TTN_LORA_FREQ_IN_866
+    bool "India (866 Mhz)"
 
 endchoice
 

esp_idf_lmic_config.h

@@ -59,3 +59,7 @@
 #if LMIC_DEBUG_LEVEL > 0 || LMIC_X_DEBUG_LEVEL > 0
 #include <stdio.h>
 #endif
+
+#define DISABLE_PING
+
+#define DISABLE_BEACONS

src/lmic/lmic.c

@@ -1715,7 +1715,8 @@ static void engineUpdate (void) {
 #endif // !DISABLE_JOIN
 
     ostime_t now    = os_getTime();
-    ostime_t rxtime = 0;
+    // ttn-esp32 change: suppress unused variable warning
+    ostime_t __attribute__((unused)) rxtime = 0;
     ostime_t txbeg  = 0;
 
 #if !defined(DISABLE_BEACONS)