The CSV file exports in Comma Seperated Values.... if you read/import in EXCEL then the top line will be the the Headings of each sensor you have in that graph.... the next line is the time....it might seem strange but its UNIX EPOCH time.... that means the machine counts the seconds(in the case of EasyIOT its milliseconds) since 1 Jan 1970....so you will need to run a formula if you want to have the value in human readable values....
PS...also remember to format the cell as a date and time.... you can goto custom format and type "dd/mm/yyyy h:mm:ss"
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-MQTT topic prefix /Db/[instance id] is no more needed. Also you do not need myMqtt.subscribe("/Db/InstanceId"); any more. In all programs simply remove /Db/[instance id] in topic. Program example with new MQTT is here
Also you can use any custom topic. Just be careful to enter custom topic in parameter configuration.