diff --git a/lib/MyESP/MyESP.cpp b/lib/MyESP/MyESP.cpp
index 9fd14b039..bd50785ab 100644
--- a/lib/MyESP/MyESP.cpp
+++ b/lib/MyESP/MyESP.cpp
@@ -2195,16 +2195,11 @@ void MyESP::begin(const char * app_hostname, const char * app_name, const char *
     }
 
     _eeprom_setup(); // set up EEPROM for storing crash data, if compiled with -DCRASH
-
     _fs_setup();        // SPIFFS setup, do this first to get values
     _wifi_setup();      // WIFI setup
     _ota_setup();       // init OTA
     _webserver_setup(); // init web server
-
-    // print a welcome message
-    myDebug_P(PSTR("\n* %s version %s"), _app_name, _app_version);
     SerialAndTelnet.flush();
-
     _setSystemCheck(false); // reset system check
     _heartbeatCheck(true);  // force heartbeat
 }
diff --git a/src/ems-esp.cpp b/src/ems-esp.cpp
index b4c7da1f5..9e8593317 100644
--- a/src/ems-esp.cpp
+++ b/src/ems-esp.cpp
@@ -1799,6 +1799,10 @@ void showerCheck() {
 // SETUP
 //
 void setup() {
+    // LA trigger create a small puls to show setup is starting...
+    INIT_MARKERS(0);
+    LA_PULSE(50);
+
     // init our own parameters
     initEMSESP();
 
diff --git a/src/ems.h b/src/ems.h
index 34a0662ba..4c05d12fb 100644
--- a/src/ems.h
+++ b/src/ems.h
@@ -12,6 +12,47 @@
 
 #include <Arduino.h>
 
+/* debug helper for logic analyzer 
+ * create marker puls on GPIOx
+ *   ° for Rx, we use GPIO14
+ *   ° for Tx, we use GPIO12
+ */
+#define LOGICANALYZER
+#ifdef LOGICANALYZER
+    #define RX_MARK_PIN 14
+    #define TX_MARK_PIN 12
+
+    #define RX_MARK_MASK (1<<RX_MARK_PIN)
+    #define TX_MARK_MASK (1<<TX_MARK_PIN)
+    #define MARKERS_MASK (RX_MARK_PIN|TX_MARK_PIN)
+
+    #define GPIO_H(mask)  (GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, (mask)))
+    #define GPIO_L(mask)  (GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, (mask)))
+
+    #define RX_PULSE(pulse) do { GPIO_H(RX_MARK_MASK);  \
+                                 delayMicroseconds(pulse);   \
+                                 GPIO_L(RX_MARK_MASK);  \
+                                } while (0)
+    #define TX_PULSE(pulse) do { GPIO_H(TX_MARK_MASK);  \
+                                 delayMicroseconds(pulse);   \
+                                 GPIO_L(TX_MARK_MASK);  \
+                                } while (0)
+    #define LA_PULSE(pulse)     do { GPIO_H(MARKERS_MASK); \
+                                 delayMicroseconds(pulse);   \
+                                  GPIO_L(MARKERS_MASK); \
+                                } while (0)
+
+    #define INIT_MARKERS(void)  do { pinMode(RX_MARK_PIN, OUTPUT);\
+                                     pinMode(TX_MARK_PIN, OUTPUT);\
+                                     GPIO_L(MARKERS_MASK);        \
+                                } while (0)
+#else
+    #define RX_PULSE(pulse)
+    #define TX_PULSE(pulse)
+    #define LA_PULSE(pulse)
+    #define INIT_MARKERS(void)
+#endif
+
 #define EMS_ID_NONE 0x00 // used as a dest in broadcast messages and empty device IDs
 
 // Fixed EMS IDs
@@ -64,7 +105,9 @@ typedef enum {
 
 typedef enum {
     EMS_TX_STATUS_IDLE, // ready
-    EMS_TX_STATUS_WAIT  // waiting for response from last Tx
+    EMS_TX_STATUS_WAIT, // waiting for response from last Tx
+    EMS_TX_WTD_TIMEOUT, // watchdog timeout during send
+    EMS_TX_BRK_DETECT   // incoming BRK during Tx
 } _EMS_TX_STATUS;
 
 #define EMS_TX_SUCCESS 0x01 // EMS single byte after a Tx Write indicating a success
diff --git a/src/emsuart.cpp b/src/emsuart.cpp
index 2b6e166e0..30eb88295 100644
--- a/src/emsuart.cpp
+++ b/src/emsuart.cpp
@@ -43,6 +43,7 @@ static void emsuart_rx_intr_handler(void * para) {
     // BREAK detection = End of EMS data block
     if (USIS(EMSUART_UART) & ((1 << UIBD))) {
         ETS_UART_INTR_DISABLE(); // disable all interrupts and clear them
+        RX_PULSE(EMSUART_BIT_TIME/2);
 
         USIC(EMSUART_UART) = (1 << UIBD); // INT clear the BREAK detect interrupt
 
@@ -170,6 +171,7 @@ void ICACHE_FLASH_ATTR emsuart_tx_brk() {
     while (((USS(EMSUART_UART) >> USTXC) & 0xFF) != 0)
         ;
 
+    TX_PULSE(EMSUART_BIT_TIME/2);
     tmp = ((1 << UCRXRST) | (1 << UCTXRST)); // bit mask
     USC0(EMSUART_UART) |= (tmp);             // set bits
     USC0(EMSUART_UART) &= ~(tmp);            // clear bits
@@ -199,17 +201,20 @@ void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len) {
 
     if (EMS_Sys_Status.emsTxMode == 0) { // classic mode logic
         for (uint8_t i = 0; i < len; i++) {
+            TX_PULSE(EMSUART_BIT_TIME/4);
             USF(EMSUART_UART) = buf[i];
         }
         emsuart_tx_brk();                       // send <BRK>
     } else if (EMS_Sys_Status.emsTxMode == 1) { // With extra tx delay for EMS+
         for (uint8_t i = 0; i < len; i++) {
+            TX_PULSE(EMSUART_BIT_TIME/4);
             USF(EMSUART_UART) = buf[i];
             delayMicroseconds(EMSUART_TX_BRK_WAIT); // https://github.com/proddy/EMS-ESP/issues/23#
         }
         emsuart_tx_brk();                       // send <BRK>
     } else if (EMS_Sys_Status.emsTxMode == 3) { // Junkers logic by @philrich
         for (uint8_t i = 0; i < len; i++) {
+            TX_PULSE(EMSUART_BIT_TIME/4);
             USF(EMSUART_UART) = buf[i];
 
             // just to be safe wait for tx fifo empty (needed?)
@@ -237,6 +242,7 @@ void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len) {
 
         // throw out the telegram...
         for (uint8_t i = 0; i < len;) {
+            TX_PULSE(EMSUART_BIT_TIME/4);
             USF(EMSUART_UART) = buf[i++]; // send each Tx byte
             // wait for echo from busmaster
             while ((((USS(EMSUART_UART) >> USRXC) & 0xFF) < i || (USIS(EMSUART_UART) & (1 << UIBD)))) {
@@ -249,6 +255,7 @@ void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len) {
         // otherwise we send the final Tx-BRK in the loopback and re=enable Rx-INT.
         // worst case, we'll see an additional Rx-BRK...
         if (!(USIS(EMSUART_UART) & (1 << UIBD))) {
+            TX_PULSE(EMSUART_BIT_TIME/2);
             // no bus collision - send terminating BRK signal
             USC0(EMSUART_UART) |= (1 << UCLBE); // enable loopback
             USC0(EMSUART_UART) |= (1 << UCBRK); // set <BRK>