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[bconway]

It will be in the future, it is currently part of the NS 3.10 test release:

[release] ChirpStack Network Server v3.10 (test releases)

ChirpStack Network Server v3.10.0-test.1 Features Multi-downlink commands and ACKs With this feature, ChirpStack Network Server will send all downlink opportunities (e.g. RX1 and RX2) at once to the gateway, reducing the number of roundtrip in case of failures. Previously ChirpStack Network Server would send the next downlink opportunity on a received nACK. In case of a retry, this saves one roundtrip reducing the risk of a failed downlink due to network latency. The gateway will always send at…