HEX formatted downlink payload from Node-RED

Greetings,

we are currently trying to implement a downlink flow from node-red to a device thatn only accepts (closed firmware) HEX commands (Dragino LT-33222-L) but we can’t get it to work on node-red since it only allows for string and buffer for output data and not HEX. i’ve already tried sending the payload via the downlink queue on the AEP GUI and it does work properly but i want to implement it on node to be able to query some variables via MQTT and based on that create the needed payload.

is there any way to send HEX payloads using this node?