Receiving a 400 response and being unable to acquire data could be due to one of the following reasons.
・1,000 or more data items have been registered, and the top value has not been specified.
・The total size of the data you preferred to acquire exceeds 16 MB.

The limit to the number of data items that can be acquired with a single API use with the IoT-PF is 1,000 items. Therefore, in instances where 1,000 data items or more are registered, you will need to specify the top value when acquiring data. In addition, we recommend lowering the top value specified when acquiring large amounts of data registered.