Hi Vishal,
The message basically means that the protobuf is corrupted (or isn't a
protobuf at all).
The message is giving you more detail on the specific kind of data
corruption. Protocol buffers don't allow tag number 0 -- you can't define a
field like "int32 a = 0". But the binary protobuf you tried to parse
contained a tag with field number zero. So parsing the protobuf failed.
Josh
On Friday, February 5, 2016 at 1:38:03 PM UTC-8, Vishal Singh wrote:
>
> Hi,
>
> I am building an application using Sitewhere in which the message exchange
> between device and the server is done using Protocol Buffer format. The
> server sends a command to the device after converting the message in this
> format, but at the device end when the bytes array is converted to get the
> command, following exception is thrown:
>
> com.google.protobuf.InvalidProtocolBufferException: Protocol message
> contained an invalid tag (zero).
> at
> com.google.protobuf.CodedInputStream.readTag(CodedInputStream.java:108)
> at
> com.sitewhere.android.generated.Android$AndroidSpecification$_Header.(Android.java:212)
> at
> com.sitewhere.android.generated.Android$AndroidSpecification$_Header.(Android.java:203)
> at
> com.sitewhere.android.generated.Android$AndroidSpecification$_Header$1.parsePartialFrom(Android.java:255)
> at
> com.sitewhere.android.generated.Android$AndroidSpecification$_Header$1.parsePartialFrom(Android.java:1)
> at
> com.google.protobuf.AbstractParser.parsePartialFrom(AbstractParser.java:200)
> at
> com.google.protobuf.AbstractParser.parsePartialDelimitedFrom(AbstractParser.java:241)
> at
> com.google.protobuf.AbstractParser.parseDelimitedFrom(AbstractParser.java:253)
> at
> com.google.protobuf.AbstractParser.parseDelimitedFrom(AbstractParser.java:259)
> at
> com.google.protobuf.AbstractParser.parseDelimitedFrom(AbstractParser.java:49)
> at
> com.sitewhere.android.generated.Android$AndroidSpecification$_Header.parseDelimitedFrom(Android.java:410)
> at
> com.sitewhere.android.example.SiteWhereExample.onReceivedCustomCommand(SiteWhereExample.java:273)
> at
> com.sitewhere.android.SiteWhereActivity$SiteWhereResponseProcessor.receivedCustomCommand(SiteWhereActivity.java:231)
> at
> com.sitewhere.android.mqtt.RegistrationManager.onCustomCommandReceived(RegistrationManager.java:112)
> at
> com.sitewhere.android.mqtt.DefaultMqttInteractionManager$MqttMessageProcessor.run(DefaultMqttInteractionManager.java:139)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:390)
> at java.util.concurrent.FutureTask.run(FutureTask.java:234)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
>
> I have no clue what is the meaning of "Protocol message contained an
> invalid tag (zero)". Please help. The byte array received from the server
> is:
>
>
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