diff --git a/.gitignore b/.gitignore
index b3ae506..2bb98e8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,6 +46,7 @@ test/.deps
 *.lo
 .libs/
 bin/libmbus.1
+bin/libmbus.1
 bin/mbus-serial-request-data
 bin/mbus-serial-request-data-multi-reply
 bin/mbus-serial-scan
@@ -57,3 +58,5 @@ bin/mbus-tcp-request-data-multi-reply
 bin/mbus-tcp-scan
 bin/mbus-tcp-scan-secondary
 bin/mbus-tcp-select-secondary
+!*.c
+
diff --git a/bin/mbus-serial-request-data-multi-reply.c b/bin/mbus-serial-request-data-multi-reply.c
index 7d9b04b..787a651 100755
--- a/bin/mbus-serial-request-data-multi-reply.c
+++ b/bin/mbus-serial-request-data-multi-reply.c
@@ -31,7 +31,7 @@ init_slaves(mbus_handle *handle)
     if (mbus_send_ping_frame(handle, MBUS_ADDRESS_NETWORK_LAYER, 1) == -1)
     {
         return 0;
-    }
+    }  
 
     //
     // resend SND_NKE, maybe the first get lost
diff --git a/mbus/mbus-protocol-aux.c b/mbus/mbus-protocol-aux.c
index 57758eb..ec0f6f0 100755
--- a/mbus/mbus-protocol-aux.c
+++ b/mbus/mbus-protocol-aux.c
@@ -1353,6 +1353,7 @@ mbus_context_serial(const char *device)
 
     handle->max_retry = 3;
     handle->is_serial = 1;
+    handle->purge_first_frame = MBUS_FRAME_PURGE_M2S;
     handle->auxdata = serial_data;
     handle->open = mbus_serial_connect;
     handle->close = mbus_serial_disconnect;
@@ -1395,6 +1396,7 @@ mbus_context_tcp(const char *host, int port)
 
     handle->max_retry = 3;
     handle->is_serial = 0;
+    handle->purge_first_frame = MBUS_FRAME_PURGE_M2S;
     handle->auxdata = tcp_data;
     handle->open = mbus_tcp_connect;
     handle->close = mbus_tcp_disconnect;
@@ -1467,6 +1469,18 @@ mbus_recv_frame(mbus_handle * handle, mbus_frame *frame)
     }
 
     result = handle->recv(handle, frame);
+    
+    switch (mbus_frame_direction(frame))
+    {
+        case MBUS_CONTROL_MASK_DIR_M2S:
+            if (handle->purge_first_frame == MBUS_FRAME_PURGE_M2S)
+                result = handle->recv(handle, frame);  // purge echo and retry 
+    	     break;
+        case MBUS_CONTROL_MASK_DIR_S2M:
+            if (handle->purge_first_frame == MBUS_FRAME_PURGE_S2M)
+                result = handle->recv(handle, frame);  // purge echo and retry 
+             break;
+    }
 
     if (frame != NULL)
     {
diff --git a/mbus/mbus-protocol-aux.h b/mbus/mbus-protocol-aux.h
index 5b63188..02694d9 100755
--- a/mbus/mbus-protocol-aux.h
+++ b/mbus/mbus-protocol-aux.h
@@ -70,12 +70,17 @@
 #define MBUS_PROBE_COLLISION 2
 #define MBUS_PROBE_ERROR     -1
 
+#define MBUS_FRAME_PURGE_S2M  2
+#define MBUS_FRAME_PURGE_M2S  1
+#define MBUS_FRAME_PURGE_NONE 0
+
 /**
  * Unified MBus handle type encapsulating either Serial or TCP gateway.
  */
 struct _mbus_handle {
     int fd;
     int max_retry;
+    char purge_first_frame;
     char is_serial; /**< _handle type (non zero for serial) */
     int (*open) (struct _mbus_handle *handle);
     int (*close) (struct _mbus_handle *handle);
diff --git a/mbus/mbus-protocol.c b/mbus/mbus-protocol.c
index 59736e9..e627091 100755
--- a/mbus/mbus-protocol.c
+++ b/mbus/mbus-protocol.c
@@ -300,6 +300,26 @@ mbus_frame_type(mbus_frame *frame)
     return -1;
 }
 
+//------------------------------------------------------------------------------
+/// Return the M-Bus frame direction 
+//------------------------------------------------------------------------------
+int
+mbus_frame_direction(mbus_frame *frame)
+{
+    if (frame)
+    {
+        if (frame->type == MBUS_FRAME_TYPE_ACK)
+        {
+            return MBUS_CONTROL_MASK_DIR_S2M;    
+        }
+        else
+        {
+            return (frame->control & MBUS_CONTROL_MASK_DIR);
+        }
+    }
+    return -1;
+}
+
 //------------------------------------------------------------------------------
 /// Verify that parsed frame is a valid M-bus frame. 
 //
@@ -836,6 +856,15 @@ mbus_data_product_name(mbus_data_variable_header *header)
                     break;
             }
         }
+        else if (manufacturer == MBUS_VARIABLE_DATA_MAN_RKE)
+        {
+            switch (header->version)
+            {
+                case 0x69:
+                    strcpy(buff,"Ista sensonic II mbus");
+                    break;
+            }
+        }
         else if (manufacturer == MBUS_VARIABLE_DATA_MAN_SVM) 
         {
             switch (header->version)
@@ -2713,7 +2742,23 @@ mbus_data_variable_parse(mbus_frame *frame, mbus_data_variable *data)
 int
 mbus_frame_data_parse(mbus_frame *frame, mbus_frame_data *data)
 {
-    if (frame && data)
+    char direction;
+
+    if (frame == NULL)
+    {
+        snprintf(error_str, sizeof(error_str), "Got null pointer to frame.");
+        return -1;
+    }
+    
+    if (data == NULL)
+    {
+        snprintf(error_str, sizeof(error_str), "Got null pointer to data.");
+        return -1;
+    }
+    
+    direction = (frame->control & MBUS_CONTROL_MASK_DIR);
+    
+    if (direction == MBUS_CONTROL_MASK_DIR_S2M)
     {
         if (frame->control_information == MBUS_CONTROL_INFO_ERROR_GENERAL)
         {
@@ -2761,9 +2806,13 @@ mbus_frame_data_parse(mbus_frame *frame, mbus_frame_data *data)
             return -1;
         }
     }
-    
-    snprintf(error_str, sizeof(error_str), "Got null pointer to frame or data.");
-
+    else
+    { 
+        snprintf(error_str, sizeof(error_str), "Wrong direction in frame (master to slave)");
+            
+        return -1;
+    }
+        
     return -1;
 }
 
diff --git a/mbus/mbus-protocol.h b/mbus/mbus-protocol.h
index 8ec0ce6..c1473a3 100755
--- a/mbus/mbus-protocol.h
+++ b/mbus/mbus-protocol.h
@@ -484,6 +484,7 @@ typedef struct _mbus_data_secondary_address {
 #define MBUS_VARIABLE_DATA_MAN_NZR              0x3B52
 #define MBUS_VARIABLE_DATA_MAN_PAD              0x4024
 #define MBUS_VARIABLE_DATA_MAN_QDS              0x4493
+#define MBUS_VARIABLE_DATA_MAN_RKE              0x4965
 #define MBUS_VARIABLE_DATA_MAN_SEN              0x4CAE
 #define MBUS_VARIABLE_DATA_MAN_SLB              0x4D82
 #define MBUS_VARIABLE_DATA_MAN_SON              0x4DEE
@@ -555,6 +556,7 @@ const char *mbus_data_fixed_function(int status);
 // M-Bus frame data struct access/write functions
 //
 int mbus_frame_type(mbus_frame *frame);
+int mbus_frame_direction(mbus_frame *frame);
 
 //
 // Slave status data register.