Serialize DateTime as unix ms (long) instead of string

[ghanjys]

Hi,

We are using KafkaFlow to write Avro messages to Kafka.
Our classes are generated from a protocol-file using avrogen.
One of the fields is a long of logical type "timestamp-millis", which is converted to a DateTime property in the class.

{ "type" : "record", "name" : "Production", "namespace" : "", "fields" : [ { "name" : "ProductionStart", "type" : { "type" : "long", "logicalType" : "timestamp-millis" } }

When writing a message using our KafkaFlow producer, the DateTime field is then serialized to a string in format "yyyy-mm-ddThh:mm:ss".
The consumer is a telegraf Kafka consumer plugin which, based on the schema, expects the "ProductionStart" field to be a long and tries to convert it as such, resulting in an error.
I assume this is correct behavior on the consumer's end and the producer should instead serialize the DateTime as a long, in accordance with the schema.

Is there a way to configure KafkaFlow to serialize DateTime as long?
Or is DateTime not the correct type for a timestamp_ms field and should I look into the classes generated by avrogen?

Thanks.