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https://issues.apache.org/jira/browse/MYNEWT-774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christopher Collins resolved MYNEWT-774.
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Resolution: Fixed
> Intermittent serial errors in newtmgr messages on Arduino Zero
> --------------------------------------------------------------
>
> Key: MYNEWT-774
> URL: https://issues.apache.org/jira/browse/MYNEWT-774
> Project: Mynewt
> Issue Type: Bug
> Security Level: Public(Viewable by anyone)
> Reporter: Christopher Collins
> Assignee: Christopher Collins
> Fix For: v1_1_0_rel
>
>
> (Pull request: https://github.com/apache/incubator-mynewt-core/pull/323)
> Using the nmgr_shell transport (newtmgr over shell), some incoming commands
> get dropped. The problem seems to be caused by an exhaustion of shell events.
> By default, the shell only allocates a single event.
> The sequence looks like this:
> # Client sends newtmgr command to device.
> # Console passes newtmgr command to shell.
> # Shell allocates the only event and fills it with the data.
> # Shell processes event, hands data to newtmgr code.
> # Newtmgr processes command and sends response.
> # Client sees response and sends follow-up command.
> # Console passes newtmgr command to shell.
> # Shell has no events left; drops incoming command.
> # Initial event gets freed.
> By changing the default event count from 1 to 2, we ensure there is always a
> spare event available. Since we will never send the second response before
> freeing the first event, two events is sufficient.
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