From aa187fa523794eb387192ce97cad3b785bb5b574 Mon Sep 17 00:00:00 2001
From: Gabriel Radzki <gabriel.radzki@gmail.com>
Date: Wed, 18 Dec 2024 21:16:49 -0300
Subject: [PATCH 1/3] Update RCSwitch.cpp

Sync factor before sending signal
---
 RCSwitch.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/RCSwitch.cpp b/RCSwitch.cpp
index 99d3cc1..727df01 100644
--- a/RCSwitch.cpp
+++ b/RCSwitch.cpp
@@ -508,13 +508,13 @@ void RCSwitch::send(unsigned long code, unsigned int length) {
 #endif
 
   for (int nRepeat = 0; nRepeat < nRepeatTransmit; nRepeat++) {
+    this->transmit(protocol.syncFactor);
     for (int i = length-1; i >= 0; i--) {
       if (code & (1L << i))
         this->transmit(protocol.one);
       else
         this->transmit(protocol.zero);
     }
-    this->transmit(protocol.syncFactor);
   }
 
   // Disable transmit after sending (i.e., for inverted protocols)

From f36945e06e3dfec64d4b62952e9accfd29e9af11 Mon Sep 17 00:00:00 2001
From: Gabriel Radzki <gabriel.radzki@gmail.com>
Date: Sat, 21 Dec 2024 23:46:42 -0300
Subject: [PATCH 2/3] Setter for sync factor order

---
 RCSwitch.cpp | 20 +++++++++++++++++++-
 RCSwitch.h   |  1 +
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/RCSwitch.cpp b/RCSwitch.cpp
index 727df01..4062363 100644
--- a/RCSwitch.cpp
+++ b/RCSwitch.cpp
@@ -114,6 +114,7 @@ RCSwitch::RCSwitch() {
   this->nTransmitterPin = -1;
   this->setRepeatTransmit(10);
   this->setProtocol(1);
+  this->setSyncFactorFirst(false);
   #if not defined( RCSwitchDisableReceiving )
   this->nReceiverInterrupt = -1;
   this->setReceiveTolerance(60);
@@ -158,6 +159,14 @@ void RCSwitch::setPulseLength(int nPulseLength) {
   this->protocol.pulseLength = nPulseLength;
 }
 
+/**
+  * Sets sync factor to be sent first, before the code word
+  */
+void RCSwitch::setSyncFactorFirst(bool syncFactor) {
+  this->syncFactorFirst = syncFactor;
+}
+
+
 /**
  * Sets Repeat Transmits
  */
@@ -508,13 +517,22 @@ void RCSwitch::send(unsigned long code, unsigned int length) {
 #endif
 
   for (int nRepeat = 0; nRepeat < nRepeatTransmit; nRepeat++) {
-    this->transmit(protocol.syncFactor);
+    
+    if (this->syncFactorFirst) {
+      this->transmit(protocol.syncFactor);
+    }
+    
     for (int i = length-1; i >= 0; i--) {
       if (code & (1L << i))
         this->transmit(protocol.one);
       else
         this->transmit(protocol.zero);
     }
+
+    if (!this->syncFactorFirst) {
+      this->transmit(protocol.syncFactor);
+    }
+
   }
 
   // Disable transmit after sending (i.e., for inverted protocols)
diff --git a/RCSwitch.h b/RCSwitch.h
index b7755e0..c66f1ff 100644
--- a/RCSwitch.h
+++ b/RCSwitch.h
@@ -162,6 +162,7 @@ class RCSwitch {
     #endif
     int nTransmitterPin;
     int nRepeatTransmit;
+    bool syncFactorFirst = false;
     
     Protocol protocol;
 

From d616ce0fb9b605830da0b321488859d9a7fc41c2 Mon Sep 17 00:00:00 2001
From: Gabriel Radzki <gabriel.radzki@gmail.com>
Date: Sat, 21 Dec 2024 23:51:33 -0300
Subject: [PATCH 3/3] Add missing declaration

---
 RCSwitch.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/RCSwitch.h b/RCSwitch.h
index c66f1ff..1e818e0 100644
--- a/RCSwitch.h
+++ b/RCSwitch.h
@@ -97,6 +97,7 @@ class RCSwitch {
     void enableTransmit(int nTransmitterPin);
     void disableTransmit();
     void setPulseLength(int nPulseLength);
+    void setSyncFactorFirst(bool syncFactorFirst);
     void setRepeatTransmit(int nRepeatTransmit);
     #if not defined( RCSwitchDisableReceiving )
     void setReceiveTolerance(int nPercent);