diff --git a/src/CHANGES.md b/src/CHANGES.md
index 09df4b0b..ae341ba6 100644
--- a/src/CHANGES.md
+++ b/src/CHANGES.md
@@ -2,6 +2,9 @@
 
 (starting from release version `0.5.66`)
 
+## 0.5.80
+* fixed communication #656
+
 ## 0.5.79
 * fixed mixed reset flags #648
 * fixed `mCbAlarm` if MQTT is not used #653
diff --git a/src/defines.h b/src/defines.h
index 2a12e0e6..9dfb7884 100644
--- a/src/defines.h
+++ b/src/defines.h
@@ -13,7 +13,7 @@
 //-------------------------------------
 #define VERSION_MAJOR       0
 #define VERSION_MINOR       5
-#define VERSION_PATCH       79
+#define VERSION_PATCH       80
 
 //-------------------------------------
 typedef struct {
diff --git a/src/hm/hmRadio.h b/src/hm/hmRadio.h
index 9f671c54..b3466d00 100644
--- a/src/hm/hmRadio.h
+++ b/src/hm/hmRadio.h
@@ -9,6 +9,7 @@
 #include "../utils/dbg.h"
 #include <RF24.h>
 #include "../utils/crc.h"
+#include "../config/config.h"
 
 #define SPI_SPEED           1000000
 
@@ -43,8 +44,6 @@ const char* const rf24AmpPowerNames[] = {"MIN", "LOW", "HIGH", "MAX"};
 
 #define BIT_CNT(x)  ((x)<<3)
 
-static volatile bool mIrqRcvd;
-
 //-----------------------------------------------------------------------------
 // HM Radio class
 //-----------------------------------------------------------------------------
@@ -313,6 +312,7 @@ class HmRadio {
                 mSendCnt++;
         }
 
+        volatile bool mIrqRcvd;
         uint64_t DTU_RADIO_ID;
 
         uint8_t mRfChLst[RF_CHANNELS];
diff --git a/src/hm/payload.h b/src/hm/payload.h
index 071dfe0c..72166390 100644
--- a/src/hm/payload.h
+++ b/src/hm/payload.h
@@ -48,7 +48,6 @@ class Payload {
             mSerialDebug  = false;
             mHighPrioIv   = NULL;
             mCbAlarm      = NULL;
-            mCbAlarm = NULL;
         }
 
         void enableSerialDebug(bool enable) {