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Hi OroN. What device are you using? Does it support only a single fragmentation session and hence an index of 1 exceeds its capacity (in other words, are you saying AWS IoT Core for LoRaWAN sends an index of 1 but you think it should be 0)?
In regards to the fragment and number of fragments, these settings are not currently exposed to the user. However, they change based on the DR inherited from the multicast group.
UPDATE: AWS IoT Core for LoRaWAN uses fragmentation index 0 for unicast FUOTA and fragmentation index 1 for multicast FUOTA.
Yes we use an embedded device with a Lorawan stack library supporting only one multicast session. The multicast index value is zero due to the following requirements in "Lorawan Remote Multicast Setup specification v1.0.0"
Is it possible to set the AWS lorawan multicast index to zero to be compliant to the requirement?
As per my other comment, the issue is the fragmentation session and index, not multicast.
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Yes we use an embedded device with a Lorawan stack library supporting only one multicast session. The multicast index value is zero due to the following requirements in "Lorawan Remote Multicast Setup specification v1.0.0". Is it possible to set the AWS lorawan multicast index to zero to be compliant to the requirement?
You said in your question that the error is
FragmentationIndexUnsupported
. This relates to fragmentation index and session, not multicast. If your device is using LoRaMAC-node, then the error comes from here: https://github.com/Lora-net/LoRaMac-node/blob/master/src/apps/LoRaMac/common/LmHandler/packages/LmhpFragmentation.c#L373 . I re-tested FUOTA. AWS IoT Core for LoRaWAN correctly used multicast index 0. However, the fragmentation index is 1 when I think it should be 0 for the first session. I have reported it. I will keep you posted.Are you able to modify the device firmware? If so, you could increase
FRAGMENTATION_MAX_SESSIONS
to get un-blocked for the time being.OK, AWS IoT Core for LoRaWAN uses fragmentation index 0 for unicast FUOTA and fragmentation index 1 for multicast FUOTA.