diff --git a/fhem/FHEM/79_BDKM.pm b/fhem/FHEM/79_BDKM.pm
index bb7dcd609..378fd6772 100644
--- a/fhem/FHEM/79_BDKM.pm
+++ b/fhem/FHEM/79_BDKM.pm
@@ -173,7 +173,7 @@ my @RC35DEFAULTS =
     qw(/gateway/DateTime:0:0:DateTime
 );
 
-# extra valid value not in range which is set by gateway
+# extra valid value not in range (set by gateway)
 my %extra_value=
 qw(/heatingCircuits/hc1/fastHeatupFactor 0
    /heatingCircuits/hc1/temporaryRoomSetpoint -1
@@ -196,6 +196,7 @@ sub BDKM_Initialize($)
 
     $hash->{AttrList}        = 
         "BaseInterval " .
+        "InterPollDelay " .
         "PollIds:textField-long  " .
         "HttpTimeout " .
         $readingFnAttributes;
@@ -269,7 +270,7 @@ sub BDKM_Define($$)
     $hash->{IDS}                              = {}; # Hash containing IDS of first full poll
     $hash->{VERSION}                          = '$Id$';    
     # init attrs to defaults:
-    map {BDKM_Attr("del",$name,$_)} qw(BaseInterval ReadBackDelay HttpTimeout);
+    map {BDKM_Attr("del",$name,$_)} qw(BaseInterval InterPollDelay ReadBackDelay HttpTimeout);
 
     BDKM_reInit($hash);
     return undef;
@@ -293,6 +294,14 @@ sub BDKM_Attr(@)
             $hash->{BASEINTERVAL} = $val;            
             BDKM_reInit($hash);
         } 
+    } elsif ($attr eq "InterPollDelay") {
+        $del and $val = 0; # default
+        if($val !~ /^\d+$/) {
+            return $error."needs interger value";
+        } else {
+            $hash->{INTERPOLLDELAY} = $val/1000;            
+            BDKM_reInit($hash);
+        } 
     } elsif($attr eq "ReadBackDelay") {
         $del and $val = 500;
         if($val !~ /^\d+$/ or $val < 100 or $val > 2000) {
@@ -394,7 +403,11 @@ sub BDKM_doSequence($)
     # restart timer for next sequence
     BDKM_Timer($hash,$hash->{BASEINTERVAL},"BDKM_doSequence");
     # only start polling if we are not polling (e.g. due to network promlems)
-    $hash->{ISPOLLING} and return;
+    if($hash->{ISPOLLING}) {
+        Log3 $hash, 3, $hash->{NAME}." trying to start new sequence while previous not finished";
+        Log3 $hash, 3, $hash->{NAME}." Gateway not responding? BaseInterval too short? InterPollDelay too high?";
+        return;
+    }
     $hash->{ISPOLLING}=1;
     my $seq = $hash->{SEQUENCE};
     my $h   = $hash->{POLLIDS};
@@ -486,8 +499,11 @@ sub BDKM_JobQueueNextIdHttpDone($)
             Log3 $hash, 4, "$name $id - no JSON data available - raw data: $data";
         }
     }
-    BDKM_JobQueueNextId($hash); # get next id
-
+    if($hash->{INTERPOLLDELAY}) {
+        BDKM_Timer($hash,$hash->{INTERPOLLDELAY},"BDKM_JobQueueNextId");
+    } else {
+        BDKM_JobQueueNextId($hash);
+    }
     return;
 }
 
@@ -1074,7 +1090,10 @@ sub BDKM_update_id_from_json
         } elsif ($type eq "yRecording") {
             defined $h->{TYPE} or $h->{TYPE}="Recroding";
             # ignore recordings - fhem records :-)
-        } elsif ($type eq "refEnum") { # ignore directory entry
+        } elsif ($type eq "refEnum") { 
+            # ignore directory entry
+        } elsif ($type eq "eMonitoringList") { 
+            # ignore eMonitoringList - I don't have infos about that
         } else {
             Log3 $hash, 2, "$hash->{NAME}: unknown type $type for $id";
         }
@@ -1238,6 +1257,15 @@ sub BDKM_MapSwitchPrograms
       It defaults to 120 seconds. Which means that every 120 seconds a
       new poll collects values of IDs which turn it is.
     </li><br>
+    <li>InterPollDelay<br>
+      The delay time in milliseconds between reading of two IDs from 
+      the gateway. It defaults to 0 (read as fast as possible).
+      Some gateways/heatings seem to stop answering after a while
+      when you are reading a lot of IDs. (verbose 2 "communication ERROR").
+      To avoid gateway hangups always try to read only as many IDs as 
+      really required. If it doesn't help try to increase the 
+      InterPollDelay value. E.g. start with 100.
+    </li><br>
     <li>ReadBackDelay<br>
       Read back delay for the set command in milliseconds.  This value
       defaults to 500 (0.5s).  After setting a value, the gateway need