Downlink data msg failure?

Hi,
I am trying to send a Downlink message to Dragino lgt-92 v. 1.6.4 on The Thing Stack Community edition.The message is 0100012C to configure the Trasmit Time Interval at 300s on the device. On TTN I get the message:

TYPE:
Decode downlink data message failure
DATA PREVIEW:
No decoder defined for codec lgt92-codec

How can I solve it?

Many thanks