Downlink Failed: RX_Timeout

[dadanugm]

Hi, Iam using RFM95 as lorawan transmitter to the RAK Lorawan Gateway. Uplink data is successfully transmitted, but not with downlink data, apparently it has issue with RX_Timeout that keep appear after successfully transmitted an uplink Data. I tried send downlink data to node but failed due to this Issue.
here the debug result:

Mbed LoRaWANStack initialized

CONFIRMED message retries : 3

set class OK

Adaptive data rate (ADR) - Disable

set datarate OK

Connection - In Progress …

Connection - Successful
[2K[39m[INFO][LMAC]: RTS = 14 bytes, PEND = 0, Port: 6[0m

14 bytes scheduled for transmission
[2K[31m[ERR ][LMACC]: Invalid MAC command (0x0)![0m
[2K[31m[ERR ][LSTK]: RX_ERROR: mcps_indication status = 1[0m

Message Sent to Network Server

Error in reception - Code = 9
[2K[39m[INFO][LMAC]: RTS = 14 bytes, PEND = 0, Port: 6[0m

14 bytes scheduled for transmission
[2K[31m[ERR ][LMACC]: Invalid MAC command (0x0)![0m
[2K[31m[ERR ][LSTK]: RX_ERROR: mcps_indication status = 1[0m

Message Sent to Network Server

Error in reception - Code = 9

Error no 9: RX_ Timeout
mcps_indication status no 1: LORAMAC_EVENT_INFO_STATUS_ERROR

IDE : Mbed IDE
OS: Version 6.10
Lorawan server: Chirpstack,
Gateway: RAK with mqtt bridge V.2.7.1

I've compared with another hardware e.g RAK811 (default firmware), result is OK, so I Assume there is nothing wrong with Chirpstack and RAK Gateway
Any solution would be appreciated
Thanks

[ciarmcom]

@dadanugm This issue has an incomplete or old issue template.For future reference please use an up to date clone of the repository before raising issues. Many thanks.

[ciarmcom]

Thank you for raising this detailed GitHub issue. I am now notifying our internal issue triagers.
Internal Jira reference: https://jira.arm.com/browse/IOTOSM-3908