GW’s are essentially (mostly) dumb media converters taking in LoRa based RF modulated signals, checking validity and passing on to the associated LNS any valid messages mainly over IP data comms. Similarly, they dont create downlinks, rather they ingest downlink messages from the LNS delived over the same IP links and modulate and Tx as RF. Its the LNS that creates the message payload for a downlink, GW’s are just delivery vehicles (simple version!). BTW what you have posted looks more like an uplink format… and as I see Nick just mentioned a strange thread hijack given context. Will reopen your other post/thread instead.
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