[jira] [Created] (MYNEWT-670) image / fs NMP: Make max chunk size configurable

["Christopher Collins (JIRA)" <ji...@apache.org>]

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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