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what is the issue here ? Why i am not able to see any data in my influxdb bucket.

Take a look at this message:

No metrics were created from a message. Verify your parser settings. This message is only printed once.

Your config does not specify any fields or tags to generate your metric from, hence no metric was created. You need to specify at least one field.

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Thanks !! I am new to this. do you mean i need to specify below ?

[[inputs.mqtt_consumer.topic_parsing]]

topic = ""

measurement = ""

tags = ""

fields = ""

what would come in tags/fields in my case ?

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do you mean i need to specify below ?

No not topic parsing, but configuration of your xpath_protobuf config. Backing up, you are sending abritrary data to Telegraf. Telegraf has no idea what your data looks like, what fields you are interested in, or how to parse the data. So your xpath config needs to grow to teach telegraf how to parse the metrics you are sending and how to generate metrics from that data. This is essentially the topic of parsing data.

In your case, you are using the xpath parser, so need to define some specific fields and optionally some tags like:

[inputs.mqtt_consumer.xpath.fields]
  myfeild = "..."

[inputs.mqtt_consumer.xpath.tags]
  name   = "substring-after(Sensor/@name, ' ')"

What I would do is:

1. Is set xpath_print_document = true so you can see what data you are getting.
2. Then determine the paths to fields you want and define them as fields
3. Do the same for tags
4. Determine if your data has a timestamp you want to parse and as such also configure how to parse that timestamp.

If you share the output of your topic, and what data you want we could possible help, but I'll take this over to the Slack thread where more than just me can help.

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In my proto file i have many fields(battery, current etc.) in message Vehicle- one of them is Speed for which i am providing some value at the moment.
below is the ouput i see in telegraf logs -
XML document equivalent: "<?xml version= "1.0"? > < Speed > 25 < / Speed > "

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@sayaligo This line

xpath_protobuf_import_paths = ["C:\Program Files\telegraf-1.30.1\Types"]

contains backslashes, so you need to use single-quotes in TOML or double backslashes to get what you want. Please try with

xpath_protobuf_import_paths = ['C:\Program Files\telegraf-1.30.1\Types']

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@srebhan isn't it the same thing ? I tried what you suggested but still I cannot see the respective messages in influxdb.

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@sayaligo it is not. If you use single quotes in TOML this denotes a 'literal' string while double-quotes are interpreted. You can even see this in the github comment above, for double quotes \P and \T are escape sequences and will NOT result in a backslash.

I tried what you suggested but still I cannot see the respective messages in influxdb.

Could you please check with a file output if Telegraf generates metrics! I guess not, given that the XML is empty...
Could you provide the .proto file(s) and a (redacted) sample of the input!?

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