In some cases the explorer cannot display objects information:

The underlying error:
Read-property-multiple error.
(([:binary-value 30] :object-name :description :units :present-value) ([:binary-value 31] :object-name :description :units :present-value) ([:binary-value 32] :object-name :description :units :present-value) ([:binary-value 33] :object-name :description :units :present-value) ([:binary-value 34] :object-name :description :units :present-value) ([:binary-value 35] :object-name :description :units :present-value) ([:binary-value 36] :object-name :description :units :present-value) ([:binary-value 37] :object-name :description :units :present-value) ([:binary-value 38] :object-name :description :units :present-value) ([:binary-value 39] :object-name :description :units :present-value) ([:binary-value 40] :object-name :description :units :present-value) ([:binary-value 41] :object-name :description :units :present-value) ([:binary-value 42] :object-name :description :units :present-value) ([:binary-value 43] :object-name :description :units :present-value) ([:binary-value 44] :object-name :description :units :present-value) ([:binary-value 45] :object-name :description :units :present-value) ([:binary-value 46] :object-name :description :units :present-value) ([:binary-value 47] :object-name :description :units :present-value) ([:binary-value 48] :object-name :description :units :present-value) ([:binary-value 49] :object-name :description :units :present-value))
{:error {:raw-exception #error {
:cause "index 0 is >= queue size 0"
:via
[{:type com.serotonin.bacnet4j.exception.ReflectionException
:message "java.lang.reflect.InvocationTargetException"
:at [com.serotonin.bacnet4j.type.Encodable read "Encodable.java" 237]}
{:type java.lang.reflect.InvocationTargetException
:message nil
:at [sun.reflect.GeneratedConstructorAccessor8 newInstance nil -1]}
{:type java.lang.IllegalArgumentException
:message "index 0 is >= queue size 0"
:at [com.serotonin.bacnet4j.util.sero.ByteQueue peek "ByteQueue.java" 429]}]
:trace
[[com.serotonin.bacnet4j.util.sero.ByteQueue peek "ByteQueue.java" 429]
[com.serotonin.bacnet4j.type.primitive.Primitive createPrimitive "Primitive.java" 44]
[com.serotonin.bacnet4j.type.Encodable read "Encodable.java" 227]
[com.serotonin.bacnet4j.type.constructed.Choice read "Choice.java" 114]
[com.serotonin.bacnet4j.type.constructed.Choice <init> "Choice.java" 79]
[com.serotonin.bacnet4j.type.Encodable readChoice "Encodable.java" 267]
[com.serotonin.bacnet4j.type.constructed.ReadAccessResult$Result <init> "ReadAccessResult.java" 141]
[sun.reflect.GeneratedConstructorAccessor8 newInstance nil -1]
[sun.reflect.DelegatingConstructorAccessorImpl newInstance "DelegatingConstructorAccessorImpl.java" 45]
[java.lang.reflect.Constructor newInstance "Constructor.java" 422]
[com.serotonin.bacnet4j.type.Encodable read "Encodable.java" 230]
[com.serotonin.bacnet4j.type.constructed.SequenceOf <init> "SequenceOf.java" 87]
[com.serotonin.bacnet4j.type.Encodable readSequenceOf "Encodable.java" 309]
[com.serotonin.bacnet4j.type.Encodable readOptionalSequenceOf "Encodable.java" 342]
[com.serotonin.bacnet4j.type.constructed.ReadAccessResult <init> "ReadAccessResult.java" 75]
[sun.reflect.GeneratedConstructorAccessor10 newInstance nil -1]
[sun.reflect.DelegatingConstructorAccessorImpl newInstance "DelegatingConstructorAccessorImpl.java" 45]
[java.lang.reflect.Constructor newInstance "Constructor.java" 422]
[com.serotonin.bacnet4j.type.Encodable read "Encodable.java" 230]
[com.serotonin.bacnet4j.type.constructed.SequenceOf <init> "SequenceOf.java" 74]
[com.serotonin.bacnet4j.type.Encodable readSequenceOf "Encodable.java" 298]
[com.serotonin.bacnet4j.service.acknowledgement.ReadPropertyMultipleAck <init> "ReadPropertyMultipleAck.java" 56]
[com.serotonin.bacnet4j.service.acknowledgement.AcknowledgementService createAcknowledgementService "AcknowledgementService.java" 52]
[com.serotonin.bacnet4j.apdu.ComplexACK parseServiceData "ComplexACK.java" 211]
[com.serotonin.bacnet4j.transport.DefaultTransport completeComplexAckResponse "DefaultTransport.java" 760]
[com.serotonin.bacnet4j.transport.DefaultTransport receiveAPDU "DefaultTransport.java" 682]
[com.serotonin.bacnet4j.transport.DefaultTransport receiveImpl "DefaultTransport.java" 578]
[com.serotonin.bacnet4j.transport.DefaultTransport run "DefaultTransport.java" 498]
[java.lang.Thread run "Thread.java" 745]]}}}
For the problematic devices, this occurs when we fetch data for ~40 objects (explorer fetches data for 50 objects at a time). It is yet to be determined if it's caused by a bug in Bacnet4J or directly in the problematic devices.
In some cases the explorer cannot display objects information:

The underlying error:
Read-property-multiple error. (([:binary-value 30] :object-name :description :units :present-value) ([:binary-value 31] :object-name :description :units :present-value) ([:binary-value 32] :object-name :description :units :present-value) ([:binary-value 33] :object-name :description :units :present-value) ([:binary-value 34] :object-name :description :units :present-value) ([:binary-value 35] :object-name :description :units :present-value) ([:binary-value 36] :object-name :description :units :present-value) ([:binary-value 37] :object-name :description :units :present-value) ([:binary-value 38] :object-name :description :units :present-value) ([:binary-value 39] :object-name :description :units :present-value) ([:binary-value 40] :object-name :description :units :present-value) ([:binary-value 41] :object-name :description :units :present-value) ([:binary-value 42] :object-name :description :units :present-value) ([:binary-value 43] :object-name :description :units :present-value) ([:binary-value 44] :object-name :description :units :present-value) ([:binary-value 45] :object-name :description :units :present-value) ([:binary-value 46] :object-name :description :units :present-value) ([:binary-value 47] :object-name :description :units :present-value) ([:binary-value 48] :object-name :description :units :present-value) ([:binary-value 49] :object-name :description :units :present-value)) {:error {:raw-exception #error { :cause "index 0 is >= queue size 0" :via [{:type com.serotonin.bacnet4j.exception.ReflectionException :message "java.lang.reflect.InvocationTargetException" :at [com.serotonin.bacnet4j.type.Encodable read "Encodable.java" 237]} {:type java.lang.reflect.InvocationTargetException :message nil :at [sun.reflect.GeneratedConstructorAccessor8 newInstance nil -1]} {:type java.lang.IllegalArgumentException :message "index 0 is >= queue size 0" :at [com.serotonin.bacnet4j.util.sero.ByteQueue peek "ByteQueue.java" 429]}] :trace [[com.serotonin.bacnet4j.util.sero.ByteQueue peek "ByteQueue.java" 429] [com.serotonin.bacnet4j.type.primitive.Primitive createPrimitive "Primitive.java" 44] [com.serotonin.bacnet4j.type.Encodable read "Encodable.java" 227] [com.serotonin.bacnet4j.type.constructed.Choice read "Choice.java" 114] [com.serotonin.bacnet4j.type.constructed.Choice <init> "Choice.java" 79] [com.serotonin.bacnet4j.type.Encodable readChoice "Encodable.java" 267] [com.serotonin.bacnet4j.type.constructed.ReadAccessResult$Result <init> "ReadAccessResult.java" 141] [sun.reflect.GeneratedConstructorAccessor8 newInstance nil -1] [sun.reflect.DelegatingConstructorAccessorImpl newInstance "DelegatingConstructorAccessorImpl.java" 45] [java.lang.reflect.Constructor newInstance "Constructor.java" 422] [com.serotonin.bacnet4j.type.Encodable read "Encodable.java" 230] [com.serotonin.bacnet4j.type.constructed.SequenceOf <init> "SequenceOf.java" 87] [com.serotonin.bacnet4j.type.Encodable readSequenceOf "Encodable.java" 309] [com.serotonin.bacnet4j.type.Encodable readOptionalSequenceOf "Encodable.java" 342] [com.serotonin.bacnet4j.type.constructed.ReadAccessResult <init> "ReadAccessResult.java" 75] [sun.reflect.GeneratedConstructorAccessor10 newInstance nil -1] [sun.reflect.DelegatingConstructorAccessorImpl newInstance "DelegatingConstructorAccessorImpl.java" 45] [java.lang.reflect.Constructor newInstance "Constructor.java" 422] [com.serotonin.bacnet4j.type.Encodable read "Encodable.java" 230] [com.serotonin.bacnet4j.type.constructed.SequenceOf <init> "SequenceOf.java" 74] [com.serotonin.bacnet4j.type.Encodable readSequenceOf "Encodable.java" 298] [com.serotonin.bacnet4j.service.acknowledgement.ReadPropertyMultipleAck <init> "ReadPropertyMultipleAck.java" 56] [com.serotonin.bacnet4j.service.acknowledgement.AcknowledgementService createAcknowledgementService "AcknowledgementService.java" 52] [com.serotonin.bacnet4j.apdu.ComplexACK parseServiceData "ComplexACK.java" 211] [com.serotonin.bacnet4j.transport.DefaultTransport completeComplexAckResponse "DefaultTransport.java" 760] [com.serotonin.bacnet4j.transport.DefaultTransport receiveAPDU "DefaultTransport.java" 682] [com.serotonin.bacnet4j.transport.DefaultTransport receiveImpl "DefaultTransport.java" 578] [com.serotonin.bacnet4j.transport.DefaultTransport run "DefaultTransport.java" 498] [java.lang.Thread run "Thread.java" 745]]}}}For the problematic devices, this occurs when we fetch data for ~40 objects (explorer fetches data for 50 objects at a time). It is yet to be determined if it's caused by a bug in Bacnet4J or directly in the problematic devices.