diff --git a/firmware/lib/SiedleClient/SiedleClient.cpp b/firmware/lib/SiedleClient/SiedleClient.cpp
index f3657cc..89b4093 100644
--- a/firmware/lib/SiedleClient/SiedleClient.cpp
+++ b/firmware/lib/SiedleClient/SiedleClient.cpp
@@ -107,7 +107,7 @@ void SiedleClient::bitTimerISR() {
             if (bitNumber >= 0) {
                 auto bit = bitRead(cmd_tx_buf, bitNumber--);
                 digitalWrite(outputPin, !bit);
-            } else {
+            } else { // bitNumber < 0
                 digitalWrite(outputPin, LOW);
                 digitalWrite(outputCarrierPin, LOW);
 
diff --git a/firmware/src/siedle-service.cpp b/firmware/src/siedle-service.cpp
index c7f6996..8346730 100644
--- a/firmware/src/siedle-service.cpp
+++ b/firmware/src/siedle-service.cpp
@@ -7,6 +7,7 @@
 
 void SiedleServiceClass::begin() {
     lastTxMillis = 0;
+    lastTxCounter = 0;
     siedleClient = SiedleClient(SIEDLE_A_IN, SIEDLE_TX_PIN, SIEDLE_TX_CARRIER_PIN);
     siedleClient.begin();
 }
@@ -40,11 +41,18 @@ void SiedleServiceClass::loop() {
     if (doSend) {
         cmd = siedleTxQueue.pop();
         siedleClient.sendCmdAsync(cmd);
+        lastTxCmd = cmd;
+    }
+
+     // check if we have sent a new cmd since last run and, if so, send the cmd via MQTT
+     // note: the siedle client will not increment the tx counter if there were errors!
+    if (siedleClient.txCount > lastTxCounter) {
+        lastTxCounter = siedleClient.txCount;
+        MQTTService.sendAsync({RTCSync.getEpoch(), lastTxCmd}, sent);
     }
     interrupts();
 
     if (doSend) {
-        MQTTService.sendAsync({RTCSync.getEpoch(), cmd}, sent);
         siedleRxTxLog.push({ { RTCSync.getEpoch(), cmd }, tx });
         lastTxMillis = now;
     }
diff --git a/firmware/src/siedle-service.h b/firmware/src/siedle-service.h
index 84ee7a1..1ca6c1a 100644
--- a/firmware/src/siedle-service.h
+++ b/firmware/src/siedle-service.h
@@ -46,6 +46,8 @@ class SiedleServiceClass {
 private:
     CircularBuffer<siedle_cmd_t, SIEDLE_TX_QUEUE_LEN> siedleTxQueue;
     unsigned long lastTxMillis;
+    unsigned int lastTxCounter;
+    siedle_cmd_t lastTxCmd;
 };
 
 extern SiedleServiceClass SiedleService;