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The field names of message payloads (data) that you send to AWS IoT Analytics:
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Must contain only alphanumeric characters and underscores (_); no other special characters are allowed
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Must begin with an alphabetic character or single underscore (_).
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Cannot contain hyphens (-).
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In regular expression terms: "
^[A-Za-z_]([A-Za-z0-9]*|[A-Za-z0-9][A-Za-z0-9_]*)$". -
Cannot be greater than 255 characters.
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Are case-insensitive. Fields named "foo" and "FOO" in the same payload are considered duplicates.
For example, {"temp_01": 29} or {"_temp_01": 29} are valid, but {"temp-01": 29},
{"01_temp": 29} or {"__temp_01": 29} are invalid in message payloads.
