rename isJapanMode() to isAS923_1_JP() for precision

AS923-2 shares the same frequency band as AS923-1 (JP), making
isJapanMode() ambiguous. isAS923_1_JP() matches the sub-plan
naming convention used in LoRaMac-node and clarifies that LBT
is an ARIB STD-T108 requirement specific to Japan's AS923-1
deployment, not a property of AS923 in general.

Intermediate name until radio_law framework (RFC #2285) lands.

Author: jirogit

examples/companion_radio/MyMesh.h

@@ -152,7 +152,7 @@ class MyMesh : public BaseChatMesh, public DataStoreHost {
   uint32_t calcFloodTimeoutMillisFor(uint32_t pkt_airtime_millis) const override;
   uint32_t calcDirectTimeoutMillisFor(uint32_t pkt_airtime_millis, uint8_t path_len) const override;
   uint32_t getCADFailMaxDuration() const override {
-    if (_radio->isJapanMode()) return UINT32_MAX;  // JP LBT: no forced TX — channel must be free per ARIB STD-T108
+    if (_radio->isAS923_1_JP()) return UINT32_MAX;  // JP LBT: no forced TX — channel must be free per ARIB STD-T108
     return Dispatcher::getCADFailMaxDuration();
   }
   void onSendTimeout() override;

examples/simple_repeater/MyMesh.h

@@ -144,7 +144,7 @@ class MyMesh : public mesh::Mesh, public CommonCLICallbacks {
   void logTxFail(mesh::Packet* pkt, int len) override;
   int calcRxDelay(float score, uint32_t air_time) const override;
   uint32_t getCADFailMaxDuration() const override {
-    if (_radio->isJapanMode()) return UINT32_MAX;  // JP LBT: no forced TX — channel must be free per ARIB STD-T108
+    if (_radio->isAS923_1_JP()) return UINT32_MAX;  // JP LBT: no forced TX — channel must be free per ARIB STD-T108
     return Dispatcher::getCADFailMaxDuration();
   }
 

examples/simple_room_server/MyMesh.h

@@ -138,7 +138,7 @@ class MyMesh : public mesh::Mesh, public CommonCLICallbacks {
 
   int calcRxDelay(float score, uint32_t air_time) const override;
   uint32_t getCADFailMaxDuration() const override {
-    if (_radio->isJapanMode()) return UINT32_MAX;  // JP LBT: no forced TX — channel must be free per ARIB STD-T108
+    if (_radio->isAS923_1_JP()) return UINT32_MAX;  // JP LBT: no forced TX — channel must be free per ARIB STD-T108
     return Dispatcher::getCADFailMaxDuration();
   }
 

examples/simple_sensor/SensorMesh.h

@@ -118,7 +118,7 @@ class SensorMesh : public mesh::Mesh, public CommonCLICallbacks {
   bool allowPacketForward(const mesh::Packet* packet) override;
   int calcRxDelay(float score, uint32_t air_time) const override;
   uint32_t getCADFailMaxDuration() const override {
-    if (_radio->isJapanMode()) return UINT32_MAX;  // JP LBT: no forced TX — channel must be free per ARIB STD-T108
+    if (_radio->isAS923_1_JP()) return UINT32_MAX;  // JP LBT: no forced TX — channel must be free per ARIB STD-T108
     return Dispatcher::getCADFailMaxDuration();
   }
   uint32_t getRetransmitDelay(const mesh::Packet* packet) override;

src/Dispatcher.h

@@ -40,7 +40,7 @@ class Radio {
 
   virtual int getMaxTextLen() const { return 10 * 16; }  // default: non-JP
   virtual int getMaxGroupTextLen() const { return 10 * 16; }  // default: non-JP
-  virtual bool isJapanMode() const { return false; }  // default: non-JP
+  virtual bool isAS923_1_JP() const { return false; }  // default: non-JP
 
   /**
    * \brief  starts the raw packet send. (no wait)

src/helpers/radiolib/RadioLibWrappers.cpp

@@ -175,7 +175,7 @@ bool RadioLibWrapper::isSendComplete() {
 void RadioLibWrapper::onSendFinished() {
   _radio->finishTransmit();
   _board->onAfterTransmit();
-  if (isJapanMode()) {
+  if (isAS923_1_JP()) {
     // ARIB STD-T108: wait >= 50ms after TX before next transmission
     delay(50);
   }
@@ -191,7 +191,7 @@ bool RadioLibWrapper::isChannelActive() {
 
   // Activate JP_STRICT LBT on Japan 920MHz band 3 channels only
   // CH25=920.800MHz, CH26=921.000MHz, CH27=921.200MHz (ARIB STD-T108)
-  if (isJapanMode()) {
+  if (isAS923_1_JP()) {
     // ARIB STD-T108 compliant LBT: continuous RSSI sensing for >= 5ms
     // Energy-based sensing required; LoRa CAD not used 
     uint32_t sense_start = millis();

src/helpers/radiolib/RadioLibWrappers.h

@@ -46,15 +46,15 @@ class RadioLibWrapper : public mesh::Radio {
   virtual uint8_t getCodingRate() const { return 8; }   // default CR4/8, override in subclass
   virtual float getFreqMHz() const { return 0.0f; }     // default unknown, override in subclass
 						      //
-  bool isJapanMode() const {
+  bool isAS923_1_JP() const {
     float freq = getFreqMHz();
     return (fabsf(freq - 920.800f) < 0.05f ||
             fabsf(freq - 921.000f) < 0.05f ||
             fabsf(freq - 921.200f) < 0.05f);
   }
 
   int getMaxTextLen() const {
-    if (!isJapanMode()) return 10 * 16;  // default 160 bytes
+    if (!isAS923_1_JP()) return 10 * 16;  // default 160 bytes
     uint8_t cr = getCodingRate();
     if (cr <= 5) return 64;  // 3874ms @ SF12/BW125/CR4-5
     if (cr == 6) return 48;  // 3874ms @ SF12/BW125/CR4-6
@@ -63,7 +63,7 @@ class RadioLibWrapper : public mesh::Radio {
   }
 
   int getMaxGroupTextLen() const {
-    if (!isJapanMode()) return 10 * 16;  // default 160 bytes
+    if (!isAS923_1_JP()) return 10 * 16;  // default 160 bytes
     uint8_t cr = getCodingRate();
     if (cr <= 5) return 64;  // 3710ms @ SF12/BW125/CR4-5
     if (cr == 6) return 48;  // 3678ms @ SF12/BW125/CR4-6