hello. I am currently using chirpstack v4, device lora wan 1.0.3 version. Set 3 bits to 110 in the rfu field in the MAC header. Send unconfirmed date up message from device in ABP mode. However, I get a mic error. I don’t know why the mic error occurs.
Device registration was correct, and normal operation was confirmed when 3 bits were set to 000 in the rfu field.