Sorry for the late reply.
Thank you for the useful reference information.
Currently, M2 Gateway works fine on AWS IoT.
The cause may be the automatic update of basic station on M2 Gateway.
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Basic station version and build date and time at the time of error
Station Ver: 2.0.6(corecell/std) 2022-10-13 13:08:29 -
Normal basic station version and build date and time
Station Ver: 2.0.6(corecell/std) 2024-11-05 06:28:32 -
Other version information
Model: M2-AS923
Build Version: r1-20220615
OS Version: 0.9.4-5
Firmware Version: 1.2.0-25
LoRaWAN Region: AS923