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Re: [sparkplug-wg] NBIRTH error
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Thanks, this gives me a great direction to continue debugging.
Hello Zachary,
I haven't seen your protobuf exception but reading about it on the
internet, it sounds like something about the data could be amiss or possibly something happening in the conversion/interpretation.
I have a couple comments about your NBIRTH payload.
Your "bdSeq" type must be an Int64 and the "seq" must be zero (because it's an NBIRTH).
The Tahu package has a Java example project called the "listener". This is a minimal project that subscribes and publishes payloads. It might be a good place to start to compare what is being published to the MQTT Server.
Bryce
After a successful MQTT connection, subscription to the node command topic, I am attempting to publish an NBIRTH payload. The broker is Ignition - CirrusLink MQTT Distributor. The error message from Ignition's logs is:
Failed to handle Sparkplug B message on topic spBv1.0/Home/NBIRTH/NodeTest
com.google.protobuf.InvalidProtocolBufferException: Protocol message end-group tag did not match expected tag.
The payload as reported by Ignition's logs is:
content <{"timestamp":1677746244901,"metrics":[{"name":"bdSeq","timestamp":1677746244901,"dataType":"Uint64","value":16},{"name":"Node Control/Rebirth","timestamp":1677746244901,"dataType":"Boolean","value":false}],"seq":1}>
Or in human-readable format (copied from Ignition's logs, deleted "content <" and ">", applied JSON formatting):
{
"timestamp": 1677746244901,
"metrics": [{
"name": "bdSeq",
"timestamp": 1677746244901,
"dataType": "Uint64",
"value": 16
}, {
"name": "Node Control/Rebirth",
"timestamp": 1677746244901,
"dataType": "Boolean",
"value": false
}
],
"seq": 1
}
This message as close as I can read matches some example messages from the specification. I have tried using the SparkplugTCK, but it appears that this error happens too early for that tool to log, or I configured SparkplugTCK incorrectly. Is there an embarrassing typo I didn't catch, or what are suggestions to continue troubleshooting? Thank you for your help,
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