Packet forwarder with USB is an older version of the protocol. I believe there was no TX-ACK message that the bridge and LNS may use to remove the downlink from the queue.
Yes no TX-ACK, I found this post for more info.
Hello
Both devices (MTCAP et MTCDT) have a last firmware (6.0.1)
They were started from scratch. (Factory reset + last firmware version)
The problem is on the jonction between lora_packet_forwarder and chirpstack-mqtt-forwarder
mtcdt chirpstack-mqtt-forwarder[5174]: Handle PULL_DATA error: Expected protocol version: 2, got: 1, remote: 127.0.0.1:59944
Its look like to a incorrecte protocol version betwen this 2 applications
It seems that the 2 devices does not use the same packet_forwarder
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