emqx4.3/changes/ee/breaking-14370.en.md

Breaking Changes

For IoTDB the following are no longer supported:

• The self-describing template has been removed.

EMQX now only uses the configured data templates to process messages and no longer attempts to extract the template from the payload.

• One message can only carry one payload, arrays of payloads are no longer be supported

Now, a MQTT message is processed as an atomic insert operation (a sigle or a batch insert) to IoTDB, and it is no longer possible to generate multiple IoTDB operations from a single MQTT message.

• The data type is now a plain value, not a template value
• The REST API driver only supports IoTDB 1.3.x and later

Enhancements

• Thrift driver has add support for "batch" mode

NOTE: To avoid overlapping timestamps in a batch, it is better to use the MQTT message timestamp (${timestamp}) or carry a certain time in the payload (for example ${payload.time}) in batch mode.