MQTT data parser

MQTT data parser

I try to connect my MQTT sensors on tagoio with MQTT

WHen I send my packet with simulator, I get 
Raw payload:
[ { "variable": "temperature", "value": 71 } ]
[ { "variable": "temperature", "value": 71 } ]


WHen I receive My MQTT sensor I get

[MQTT] Device publish
{ "topic": "temperature", "payload": "[{\"variable\":\"temperature\",\"value\":71}]", "qos": 0, "isHex": false, "bucket": "63893033e7fbdf002084631d", "messageId": 0 }
{ "topic": "temperature", "payload": "[{\"variable\":\"temperature\",\"value\":71}]", "qos": 0, "isHex": false, "bucket": "63893033e7fbdf002084631d", "messageId": 0 }


Payload seem not detected and its not added to bucket.

How I can Trunk useless info? Probably with Payload parser but I dont know how. Any hints or doc I can read? I think I must keep only payload line
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