Fields

Fields are part of channels and holds data. A channel can have multiple Fields.
Each Fields data type is floting point numbers. Optional decimal point is a period.
Each Channel must have two essentil fields:

Id: Identification number of each record. User does not deal with it.
DateTime: DateTime field holds data posting time in ISO 8601 format.

Id and DateTime field are managed fields. User have not control over Id field.
DateTime Field have an optional usage. If user provide DateTime field in posted data, given DateTime is used as record time as is. If user data have not DataTime field, system is added record time automaticaly related to Api Key or MQTT Time Zone settings.
Other than ID and DateTime field, all other fields are completely user defined and managed by user.