Christopher Collins created MYNEWT-670:
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Summary: image / fs NMP: Make max chunk size configurable
Key: MYNEWT-670
URL: https://issues.apache.org/jira/browse/MYNEWT-670
Project: Mynewt
Issue Type: Improvement
Components: Newtmgr
Reporter: Christopher Collins
Assignee: Christopher Collins
Fix For: v1_1_0_rel
Currently, the largest image or file chunk that a Mynewt device can receive is
hardcoded at 400 bytes. This is not great because this number is independent
of the transport MTU, so the client has no way of knowing the limit.
The fix is to create two new compile-time settings:
* FS_UPLOAD_MAX_CHUNK_SIZE
* IMGMGR_MAX_CHUNK_SIZE
and set them to 512 by default. This value is large enough to accommodate
full-size BLE packets.
This is still not a perfect solution because these values are not tied to the
MTU in any way. One way to truly solve this would be to have an "NMP MTU" that
the client can discover. That would be a pretty big change.
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