From f0ba14ff7580fd8dfc866ec0490606485390cb3c Mon Sep 17 00:00:00 2001
From: ViezeVingertjes <michael.overhorst@gmail.com>
Date: Mon, 2 Feb 2026 18:05:26 +0100
Subject: [PATCH] Remove sync word handling from KissModem.

---
 examples/kiss_modem/KissModem.cpp | 28 +---------------------------
 examples/kiss_modem/KissModem.h   |  9 ---------
 examples/kiss_modem/main.cpp      |  5 -----
 3 files changed, 1 insertion(+), 41 deletions(-)

diff --git a/examples/kiss_modem/KissModem.cpp b/examples/kiss_modem/KissModem.cpp
index d11e8217..d9c71bf8 100644
--- a/examples/kiss_modem/KissModem.cpp
+++ b/examples/kiss_modem/KissModem.cpp
@@ -11,10 +11,9 @@ KissModem::KissModem(Stream& serial, mesh::LocalIdentity& identity, mesh::RNG& r
   _pending_tx_len = 0;
   _setRadioCallback = nullptr;
   _setTxPowerCallback = nullptr;
-  _setSyncWordCallback = nullptr;
   _getCurrentRssiCallback = nullptr;
   _getStatsCallback = nullptr;
-  _config = {0, 0, 0, 0, 0, 0x12};
+  _config = {0, 0, 0, 0, 0};
 }
 
 void KissModem::begin() {
@@ -133,18 +132,12 @@ void KissModem::processFrame() {
     case CMD_SET_TX_POWER:
       handleSetTxPower(data, data_len);
       break;
-    case CMD_SET_SYNC_WORD:
-      handleSetSyncWord(data, data_len);
-      break;
     case CMD_GET_RADIO:
       handleGetRadio();
       break;
     case CMD_GET_TX_POWER:
       handleGetTxPower();
       break;
-    case CMD_GET_SYNC_WORD:
-      handleGetSyncWord();
-      break;
     case CMD_GET_VERSION:
       handleGetVersion();
       break;
@@ -347,21 +340,6 @@ void KissModem::handleSetTxPower(const uint8_t* data, uint16_t len) {
   writeFrame(RESP_OK, nullptr, 0);
 }
 
-void KissModem::handleSetSyncWord(const uint8_t* data, uint16_t len) {
-  if (len < 1) {
-    writeErrorFrame(ERR_INVALID_LENGTH);
-    return;
-  }
-  if (!_setSyncWordCallback) {
-    writeErrorFrame(ERR_NO_CALLBACK);
-    return;
-  }
-  
-  _config.sync_word = data[0];
-  _setSyncWordCallback(data[0]);
-  writeFrame(RESP_OK, nullptr, 0);
-}
-
 void KissModem::handleGetRadio() {
   uint8_t buf[10];
   memcpy(buf, &_config.freq_hz, 4);
@@ -375,10 +353,6 @@ void KissModem::handleGetTxPower() {
   writeFrame(RESP_TX_POWER, &_config.tx_power, 1);
 }
 
-void KissModem::handleGetSyncWord() {
-  writeFrame(RESP_SYNC_WORD, &_config.sync_word, 1);
-}
-
 void KissModem::handleGetVersion() {
   uint8_t buf[2];
   buf[0] = KISS_FIRMWARE_VERSION;
diff --git a/examples/kiss_modem/KissModem.h b/examples/kiss_modem/KissModem.h
index bc7560f4..170bb0c2 100644
--- a/examples/kiss_modem/KissModem.h
+++ b/examples/kiss_modem/KissModem.h
@@ -25,10 +25,8 @@
 #define CMD_HASH              0x08
 #define CMD_SET_RADIO         0x09
 #define CMD_SET_TX_POWER      0x0A
-#define CMD_SET_SYNC_WORD     0x0B
 #define CMD_GET_RADIO         0x0C
 #define CMD_GET_TX_POWER      0x0D
-#define CMD_GET_SYNC_WORD     0x0E
 #define CMD_GET_VERSION       0x0F
 #define CMD_GET_CURRENT_RSSI  0x10
 #define CMD_IS_CHANNEL_BUSY   0x11
@@ -50,7 +48,6 @@
 #define RESP_OK               0x29
 #define RESP_RADIO            0x2A
 #define RESP_TX_POWER         0x2B
-#define RESP_SYNC_WORD        0x2C
 #define RESP_VERSION          0x2D
 #define RESP_ERROR            0x2E
 #define RESP_TX_DONE          0x2F
@@ -75,7 +72,6 @@
 
 typedef void (*SetRadioCallback)(float freq, float bw, uint8_t sf, uint8_t cr);
 typedef void (*SetTxPowerCallback)(uint8_t power);
-typedef void (*SetSyncWordCallback)(uint8_t syncWord);
 typedef float (*GetCurrentRssiCallback)();
 typedef void (*GetStatsCallback)(uint32_t* rx, uint32_t* tx, uint32_t* errors);
 
@@ -85,7 +81,6 @@ struct RadioConfig {
   uint8_t sf;
   uint8_t cr;
   uint8_t tx_power;
-  uint8_t sync_word;
 };
 
 class KissModem {
@@ -107,7 +102,6 @@ class KissModem {
 
   SetRadioCallback _setRadioCallback;
   SetTxPowerCallback _setTxPowerCallback;
-  SetSyncWordCallback _setSyncWordCallback;
   GetCurrentRssiCallback _getCurrentRssiCallback;
   GetStatsCallback _getStatsCallback;
   
@@ -128,10 +122,8 @@ class KissModem {
   void handleHash(const uint8_t* data, uint16_t len);
   void handleSetRadio(const uint8_t* data, uint16_t len);
   void handleSetTxPower(const uint8_t* data, uint16_t len);
-  void handleSetSyncWord(const uint8_t* data, uint16_t len);
   void handleGetRadio();
   void handleGetTxPower();
-  void handleGetSyncWord();
   void handleGetVersion();
   void handleGetCurrentRssi();
   void handleIsChannelBusy();
@@ -151,7 +143,6 @@ public:
   
   void setRadioCallback(SetRadioCallback cb) { _setRadioCallback = cb; }
   void setTxPowerCallback(SetTxPowerCallback cb) { _setTxPowerCallback = cb; }
-  void setSyncWordCallback(SetSyncWordCallback cb) { _setSyncWordCallback = cb; }
   void setGetCurrentRssiCallback(GetCurrentRssiCallback cb) { _getCurrentRssiCallback = cb; }
   void setGetStatsCallback(GetStatsCallback cb) { _getStatsCallback = cb; }
   
diff --git a/examples/kiss_modem/main.cpp b/examples/kiss_modem/main.cpp
index e81161bf..959222b9 100644
--- a/examples/kiss_modem/main.cpp
+++ b/examples/kiss_modem/main.cpp
@@ -52,10 +52,6 @@ void onSetTxPower(uint8_t power) {
   radio_set_tx_power(power);
 }
 
-void onSetSyncWord(uint8_t sync_word) {
-  radio_set_sync_word(sync_word);
-}
-
 float onGetCurrentRssi() {
   return radio_driver.getCurrentRSSI();
 }
@@ -88,7 +84,6 @@ void setup() {
   modem = new KissModem(Serial, identity, rng, radio_driver, board, sensors);
   modem->setRadioCallback(onSetRadio);
   modem->setTxPowerCallback(onSetTxPower);
-  modem->setSyncWordCallback(onSetSyncWord);
   modem->setGetCurrentRssiCallback(onGetCurrentRssi);
   modem->setGetStatsCallback(onGetStats);
   modem->begin();